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Sisudiesel

320, 420, 620, 634

Operators Manual
8366 40359

Sisudiesel
320, 420, 620, 634
engines

Operators Manual

01 02

Sisu Diesel Inc.

FIN37240 Linnavuori, Finland

Telephone: +358 3 341 7111
Email: info.sisudiesel@sisudiesel.com
www.sisudiesel.com
Diesel Engines, After Sales
Telefax: +358 3 341 7333

Sisu Diesel Inc. takes no responsibility for any damages caused

because of incorrect information in this manual

Contents

CONTENTS
TO THE USER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- engine type designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- location of the engine serial no. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- marking of the injection pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- lifting the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3
3
4
4
5
6

CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- air intake system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- fuel system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- lubrication system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- cooling system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- electrical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7
7
12
12
13
16
18
19

OPERATION AND DRIVING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

--- daily pre---start check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- cold start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- attention during operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- stopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- coupling additional equipment to the engine . . . . . . . . . . . . . . . . . . . . . . . . . .

20
20
20
20
22
22
23

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- periodical maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- service chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- basic service after the first 50...100 hours of operation . . . . . . . . . . . . . . . . .
--- services to be made daily or at 10 hours intervals . . . . . . . . . . . . . . . . . . . . .
--- services to be made weekly or at 50 hours intervals . . . . . . . . . . . . . . . . . . .
--- services to be made at 300 hours intervals . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- services to be made at 600 hours intervals . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- services to be made at 1200 hours intervals . . . . . . . . . . . . . . . . . . . . . . . . . .
--- services to be made at 2400 hours intervals . . . . . . . . . . . . . . . . . . . . . . . . . .
--- services to be made at 4800 hours intervals . . . . . . . . . . . . . . . . . . . . . . . . . .
--- services to be made every two years . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24
24
24
25
25
27
29
31
33
34
35
36

ADDITIONAL SERVICE AND ADJUSTING INSTRUCTION . . . . . . . . . . . . . .

--- bleed fuel system (Bosch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- check and adjust injection timing (Bosch) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- adjust idling speed (Bosch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- bleed fuel system (Stanadyne) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- check and adjust injection timing (Stanadyne) . . . . . . . . . . . . . . . . . . . . . . . .
--- adjust low idling speed (Stanadyne) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- fit cylinder head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- inspection of the zinc plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- check of the rubber element vibration damper . . . . . . . . . . . . . . . . . . . . . . . .
--- before the cold season . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- tightening torques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- lubricating oil quality requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- coolant quality requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- fuel quality requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- trouble shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- storing the engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
--- after---storage attention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

37
37
38
40
40
41
42
43
44
44
45
45
46
46
47
48
49
51
51

Contents

TO THE USER
The purpose of this manual is to familiarise you with the use and maintenance of your Sisudiesel engine
and give you the basic technical data and settings relating to its construction. Before using the engine
carefully read the operating, service and safety instructions to ensure your engine runs in the most economic way.
When contacting the Service Organisation, please state the engine type and the serial number.
We reserve the right to change the adjustment settings, equipment and also the service and repair instructions of the engines without further notice. Unless otherwise stated, the instructions and settings
apply to all variants of 320, 420, 620 and 634 engines.

ENGINE TYPE DESIGNATIONS

420 DSRIEL
Application
A = vehicle engine
G= generating set engine
L = combine harvester engine
M= marine engine
P = pump set engine
E = emission tested engine (certified) for off---road
C = emission tested engine (certified) for on---road
Equipped with intercooler
A = air to air
I = air to water
Rotary fuel injection pump (B, if equipped with Bosch P---type
injection pump)
Turbocharged engine (W, if equipped with by---pass turbo)
Basic type (E, if equipped with electronic engine control)
Number of cylinders (3, 4 or 6)

To the User

LOCATION OF THE ENGINE SERIAL NO.

The engine serial number is always stamped on
the cylinder block as the picture shows.
If the engine has a type plate, the serial number
is also on it.

2--- 1

NOTE! Because of various engine mountings the engine serial no. may also be located on the left side
of the engine.

MARKING OF THE INJECTION PUMP

2--- 4

2--- 5

The type plate of the injection pump indicates the symbol letter of the application or the order number.
In some types of rotary pumps there can be both order no. and symbol letter. This letter / order no. must
be stated when ordering an injection pump or asking for adjusting settings.

To the User

SAFETY INSTRUCTIONS
In the use and service of the engine there is always the possibility of injury. Before starting
the service read and understand the following
safety instructions and remarks!

When you are operating the engine or working near it, use hearing protectors to avoid noise injuries.
If you start the engine indoors, be sure you have proper ventilation.
Never use aerosol type of starting aid while operating the Thermostart device (risk for explosion).
Start the engine only by using the starting switch in the cabin.
Stop the engine always before service--- or repair work.
Open fire, smoking and sparks should not be allowed near the fuel system and batteries. (Specially
when loading batteries, explosive.)
Open the radiator cap with care when the engine is hot as the cooling system is pressurised. The
cooling liquid and lubrication oil of a hot engine causes injuries when touching the skin.
Avoid touching the exhaust manifold, turbocharger and the other hot parts of the engine.
tem.

Always disconnect the minus (---) wire of the battery when doing service or repair of the electric sys-

When checking fuel injectors do not let the jet of high pressure fuel contact your skin. The fuel penetrates the skin causing severe injuries. Contact your doctor immediately!
Keep the engine surfaces clean in order to avoid the risk of fire.
At temperatures on excess of 300C, e.g. if the engine is burnt by a fire, the viton seals of the engine
(e.g. the undermost o---ring of the oil pressure regulating valve) produce very highly corrosive hydrofluoric acid. Do not touch with bare hands, viton seals subjected to abnormally high temperatures. Always
use neoprene rubber or heavy duty gloves and safety glasses when decontaminating. Wash the seals
and the contaminated area with a 10 % calcium hydroxide or other alkali solution. Put all removed material in sealed plastic bags and deliver them to the point stated by the Authorities concerned.
NOTE! Never destroy viton---seals by burning!
The fuel, lubricating oil and coolant cause irritation in skin contact for long time.

Do not let oil and other liquids drop into the soil when servicing the engine. Take them to a suitable
disposal point.
Avoid unnecessary idling of the engine.
All the gaskets of the engine are of non---asbestos material.
Be careful when washing the engine with a high pressure washing machine. Do not use high pressure to wash e.g. the electric and fuel equipment or the radiator because they can easily be damaged.

To the User

LIFTING THE ENGINE

Safe lifting of the engine is done with a lifting
device where the lifting force effects the lifting
ears vertically.

WARNING

2--- 7

2--- 6

A = Engine lifting ears

Engine weight kg (without flywheel and electrical equipment).
320 D
320 DS

= 275
= 280

420 D
= 335
420 DS/DW = 340
420 DWI
= 345

620 D
620 DS
634 DS

= 500
= 510
= 515

Construction

CONSTRUCTION
TECHNICAL DATA
PRINCIPAL DIMENSIONS AND DATA

320

Number of cylinders
Displacement (ltr)
Cylinder bore (mm)
Stroke (mm)
Combustion
Compression ratio
Injection timing (B.T.D.C.)
Valve clearance, intake and exhaust (mm)
Direction of rotation from the engine front

3
3,3
108
120

FUEL SYSTEM

320

Injection pump
Fuel
Feed pressure, in---line pump
--- overflow valve opening pressure
--- static
Feed pressure, rotary type pump
--- static
--- min. pressure
Injection order
Injector
Opening pressure of the nozzle
Adjusting pressure of the nozzle
Fuel filter

LUBRICATION SYSTEM
Oil pressure in hot engine at running speed
Oil pressure at idle speed, min.
Oil capacity (ltr) without filter and oilcooler1
1)

420

620

634

4
6
6
4,4
6,6
7,4
108
108
108
120
120
134
Direct injection
16,5/18,5 : 1
Marked on the crankshaft pulley
0,35
Clockwise

420

620

634

Bosch, in---line type/Stanadyne, rotary type

Gas oil, see page 47
0,6---1,0 bar
2,7 bar
0,48 bar
0,20 bar/max. rpm
1---2---3

1---2---4---3

320

420

1---5---3---6---2---4

Five---hole nozzle
See 20/34---series Workshop Manual
See 20/34---series Workshop Manual
Bosch/CAV

620

2,5---4,0 bar
1,0 bar
12
24

634

24

Different oil sumps of many engine variants have not the same oil capacity. Capacities shown above
are for standard oil sumps.

Construction

5
L

6
7
8
15

12

14

11 10

13
420 DWRIE -- engine viewed
from the left
1.
2.
3.
4.
5.
6.
7.
8.

Thermostat
Injector
Intercooler
Thermostart device
Breather pipe
Fuel filter
Coolant drain plug
Oil cooler

9.
10.
11.
12.
13.
14.
15.

Oil filter
Coolant drain plug (oil cooler)
Oil pressure regulating valve
Oil dipstick
Injection pump
Timing indicator
Coolant pump

L = mounting point for preheating device

9
2--- 8

Construction

8
7

6
5

2--- 9

420 DWRIE -- engine viewed

from the right
1.
2.
3.
4.
5.
6.
7.
8.

Oil filler plug

Compressor
Alternator
Air conditioner compressor
Prefilter
Starter
Fuel feed pump
Turbocharger

Cross section

Construction

10

1
15
2
L

14

3
4
13

7
12
11

10

8
2--- 10

620/634 DS -- engine viewed

from the left
1.
2.
3.
4.
5.
6.
7.
8.

Thermostart device
Breather pipe
Intake manifold
Fuel filters
Oil filter
Oil pressure regulating valve
Coolant drain plug
Oil filler plug

L = mounting point for preheating device

9.
10.
11.
12.
13.
14.
15.

Oil dipstick
Injection pump
Timing indicator
Vibration damper
Stop solenoid
Thermostat
Injector

Construction

11

1
2
3

6
5

4
620/634 DS -- engine viewed
from the right
1.
2.
3.
4.
5.
6.
7.

Turbocharger
Oil filler plug
Sensor for coolant temperature
Alternator
Oil pressure sensor
Starter
Exhaust manifold

2--- 11

Construction

12

GENERAL
Sisudiesel engine---series consists of water---cooled in---line diesel engines with three, four and six cylinders. The engines are equipped with wet, changeable cylinder liners and consideration was made in
the basic design of the engines for turbocharging. To make the spare---part service easier and more flexible, the majority of parts are common to all engines in the range.

AIR INTAKE SYSTEM

The air intake system includes the pre---filter (or cyclone, if installed), air filter, turbocharger (DS/DW---engines), intercooler (cooling of inlet air, DSI/DWI---engines), inlet manifold and air pipes. A mechanical
or electric sensor can be fitted to indicate the service point of the air filter. If the engine is operating in
very dusty conditions (for example spreading lime) it must be equipped with a special pre---filter and oil
bath air filter.
Turbocharger (DS/DW -- engines)

A = By---pass channel

INLET AIR
EXHAUST GASES

2--- 12

LUBE OIL
The turbocharger is a turbo---compressor driven by exhaust gas. The compact design of the turbocharger is fast to react even during low revolutions. The turbocharger is lubricated and cooled by the
lubrication system of the engine. DW/DWI---engine is equipped with a by---pass turbocharger where excessive air pressure is adjusted by a so---called by---pass channel (A).
Cooling of inlet air (DSI/DWI -- engines)
The compressed air is cooled on the air to water basis. The air coming from the turbocharger has a temperature abt. 150C which is cooled by the cooling water of the engine down to abt. 95C. The cooling
cell is installed on the intake manifold and connected to the engine cooling system. The cooling of the
compressed air stabilises the combustion, irrespective of the temperature, and minimises the thermal
and mechanical load of the engine thus lowering nitric oxides (NOx).

Construction

13

FUEL SYSTEM
7a
7b
6

2--- 13

Fuel system (Bosch ---P injection pump)

1. Fuel tank
2. Prefilter
3. Feed pump
4. Fuel filter
5. Injection pump

6. Injector
7a. Thermostart fuel reservoir
7b. Solenoid valve
8. Glow plug
9. Overflow valve

The Sisudiesel engines are equipped with Bosch---A/P in---line injection pump or with Stanadyne rotary
injection pump.
The fuel flows from the tank via a prefilter to the feed pump and through the filter to the injection pump.
The injection pump forces the fuel into the injector that feeds fuel into the combustion space in a fine
spray.
The fuel system is often equipped with the Thermostart device to be used in cold conditions. The glow
plug receives fuel from a separate reservoir of the Thermostart device or from the overflow valve of the
injection pump regulated by the magnetic valve.
The fuel is gas oil that must be clean and free from water (see page 47, quality requirements of the fuel).

Construction

14

NOTE! Use of anti---freeze solution is not useful and not at all recommended!
Water is removed from the system by draining the water trap periodically and by cleaning the fuel tank
before frost season (see also actions before winter, page 45).

Bosch -- A injection pump

The injection pump is an in---line pump and the
basic construction is the same in all engines irrespective of the cylinder number.

1
8

Injection pump
1. Oil filler plug
2. Speed lever
3. Hand pump
4. Lube oil into the injection pump
5. O---ring seal
6a. Return of lube oil to engine
6b. Alternative oil return to engine
(e.g. aggregate application)
7. Drive gear
8. Identification plate

7
6b

6a
3

5
2--- 14

The fuel injection pump is flange mounted and sealed by one o---ring (5) in the timing gear housing. The
injection pump is driven from the crankshaft through an idler gear. The injection pump is connected to
the engine force---feed lubrication system through an external pipe (4). Lubricating oil returns to the
engine via the hole (6a) at the front end of the injection pump. In some versions, specially locally installed
engines, the return of the oil is lead through a hose (6b) from the regulator cover to the crankcase.

Injection pump with the boost control

1. Boost control
2. Cold start solenoid
3. Indicator plug for adjusting injection timing
3

2--- 15

Construction

15

Stanadyne rotary injection pump

In 20/34---series R---engines have Stanadyne rotary injection pump. The pump is driven by the idler gear
and installed on the timing gear housing. The pump is equipped with an electric stop solenoid (ignition
switch stop) and with an automatic bleeding system. Stanadyne pump internal lubrication happens with
aid of fuel. A separate fuel feed pump is of a membrane type and it is driven by the engine camshaft.

Stanadyne rotary injection pump

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

Type plate with pump order number

Timing marks under the cover
Fuel inlet
Return fuel/overflow valve
Revolution lever
Connector for wire to electric stop solenoid
Aneroid control
Boost pressure
Timing sensor (E---engine)
Interrupted screw (E---engine)

10

3
1 2

2--- 16

Injector
1

The injector has a five---hole nozzle. In the body

of the injector there is an in---built slotted nozzle
that is service free. The excess fuel lubricating the
injector needle returns into the fuel tank through
the overflow pipe.

Injector
3

1. Fuel inlet
2. Leak---off pipe connection
3. Adjusting shim
4. Pressure spring
5. Pressure pin
6. Nozzle body
7. Pressure chamber
8. Injector needle
9. Nozzle hole

4
5
6
7
8
2--- 17

Construction

16

LUBRICATION SYSTEM
The engine has a pressure lubrication system with the gear oil pump fitted to the lowest level of the engine. The oil pump is driven by the gear at the front end of the crankshaft.
Nearly all the lubrication points and auxiliary equipment are connected to the pressurised lubrication
system by oil galleries or pipes. The lubrication of the gears in the gear housing, the upper end of the
connecting rods and the pistons is mainly effected by splash lubrication.
The undersides of the pistons of the 620/634 DS engines with high output are always cooled by the oil
spray when the oil pressure is more than 3 bar.
4

1
2--- 18

Lubrication system
1. Oil pump
2. Oil pressure regulating valve
3. Oil filter
4. Turbocharger

5. Main oil bore

6. Piston cooling nozzle
7. Oil pressure sensor

It is very important that you use the lubrication oil that corresponds to ambient temperatures and loads
place on the engine (see lubricating oil chart, page 46). Always change the oil and oil filter according
to the service chart.

Construction

17

Oil pressure regulating valve

Oil pressure

2--- 19

The oil pressure regulating valve is located under the oil filter on the left side of the engine. The regulating
valve keeps the oil pressure constant independent of the engine speed.
At working speed the oil pressure is 2,5 to 4 bar depending on the temperature and the quality of lubricating oil. At idling the pressure is 1,0 bar minimum.
Oil filter and oil cooler
The oil filter is of main flow type. It has a replaceable cartridge mounted on the left side of the engine.
At the bottom of the oil filter cartridge there is a by---pass valve for cold start or possible clogging of the
filter. The filter is also equipped with a baffle that prevents the filter from emptying when the engine is
not use.
Some engine types are equipped with a lube oil cooler located between the cylinder block and the oil
filter. All the oil that circulates through the filter also goes through the cooler and is cooled by the engine
coolant circulating in the oil cooler.

COOLANT
LUBE OIL

1. Oil filter
2. Oil cooler
2--- 20

Construction

18

COOLING SYSTEM
The coolant pump is attached to the front face of the cylinder block and the thermostat housing is
mounted above it. The system has the internal liquid circulation via the by---pass pipe. The circulation
is regulated by the 2---way thermostat. This arrangement ensures a steady warming---up of the engine
under all conditions.
5

2
3

6
1

2--- 21

Cooling system
1. Coolant pump
2. Thermostat
3. By---pass pipe

4. Radiator
5. Expansion tank
6. Oil cooler

NOTE! Never use only water as a coolant but a mixture of 40 -- 60 % of water and antifreeze (see page
46, quality requirements of the coolant).
Installing the engine heater
Install the pre---heater of the coolant according to the instructions of the manufacturer.
Most engines of Sisudiesel 20/34---series have the coolant heater as standard equipment. The points
where to install the heater are to be seen in the pictures that are in the beginning of the chapter Construction.
The thread of the connection points of the external heater is M18x1,5.

Construction

19

Raw water system in marine engines

3

In the front of the engine there is a heat exchanger

that acts as a cooling water tank. The raw water
(sea water) flows through the tubes of the heat exchanger and cools the fresh water (engine coolant) which flows outside the tubes.

The raw water pump with rubber impeller is

mounted on the gear housing and is gear driven.
The pump sucks the water even at starting speed.
2

The exhaust manifold is cooled by the fresh

water. Thus the temperatures of the exhaust
manifold and the exhaust gases are lowered. This
minimises the risk of accidents and fire.
NOTE! If the engine run without raw water, the
rubber impeller must be taken out of the raw
water pump.

2--- 22

1. Heat exchanger
2. Raw water pump
3. Water cooled exhaust manifold

ELECTRICAL SYSTEM
The voltage of the electrical system is either 12 V or 24 V.
The engine may have a 1---pole or 2---pole system depending on the engine type.
NOTE!
--- Faulty connections (especially those of the battery or the alternator) will cause alternator damage.
--- Never open the charging circuit while the engine is running.
--- Disconnect the alternator and battery wires before undertaking any electrical welding.
--- Disconnect the battery wires before charging the battery.
Starting with an auxiliary battery
The following should be noted when using an auxiliary battery to start the engine:
--- Check that the auxiliary battery has the same voltage as the standard battery.
--- Open the battery plugs to avoid risk of explosion.
--- Connect the positive pole (+) of the auxiliary battery to the positive pole of the starter or to the
positive pole of the discharged battery.
--- Connect the negative pole (---) of the auxiliary battery for example to the fastening screw of the starter
or to the engine body.
--- When the engine starts, first remove the negative cable between the auxiliary battery and the
engine body. Then remove the positive cable.

Never connect the cable to the negative pole

of the discharged battery. Risk of explosion!

WARNING

Operation and Driving

20

OPERATION AND DRIVING

(Before using the engine, carefully read the SAFETY INSTRUCTIONS, page 5.)

DAILY PRE---START CHECK

Before starting the engine, check the following points:
--- Check the fuel quantity
--- Check the lubrication oil level
--- Check the coolant level
--- Check that the lubrication oil system and coolant system of the engine are not leaking
--- Clean the cyclone of the air filter

STARTING
--- Check that the stop lever is in drive position.
--- Turn the speed lever to half speed position.
--- Switch the current on.
--- Start the engine and adjust the speed with the speed lever to prevent the engine from racing.
--- Watch the oil pressure. To ensure sufficient lubrication, the pressure gauge has to be within normal
range in 3...4 seconds after starting. NOTE! This is particularly important for the lubrication of the
turbocharger (DS/DW---engines).
--- Always accelerate the engine at an even rate, never by racing.
NOTE! If the engine has not been used for over a month, crank the engine with the starter until oil pressure rises or dismount the pressure oil pipe of the turbocharger (DS/DW---engines) and pour clean lubrication oil (abt. 0,2 ltr) into the bearing housing of the turbocharger.

COLD START
(See also actions before winter, page 45)
--- Check that the stop lever is in drive position.
--- Release the engine of all extra load (move the gear to neutral position, depress the clutch pedal,
do not turn the steering wheel etc.).
--- Move the speed control lever to half speed position.
--- Switch the current on.
--- Switch on the glow current for 20 to 25 seconds.
--- Crank the engine till all cylinders are firing. Continue glowing for 30 seconds after the engine is firing
on all cylinders.
--- If the engine fails to start in 10 seconds, stop cranking and continue glowing for abt. 15 seconds.
Then start according to the foregoing instruction.
--- Watch the oil pressure. Do not race the cold engine because the lubrication is not sufficient while
the oil is cold.

Operation and Driving

21

NOTE! (The engines without the electrical stop device, Bosch injection pump)
After operating leave stop lever in drive position. Thus ensuring excess fuel feed. (The injection pump
has the excess fuel device always switched on when starting and the injection pump gives an extra
amount of fuel. At the same time the injection is retarded, which also helps the cold starting).
Always use, if possible, the coolant heater when the temperature is below 0C.
Use of aerosol type starting aid
If, under very difficult starting conditions, it is necessary to use an aerosol type of starting aid, remove
the air filter cartridges before starting to spray the aerosol to prevent the cartridges from catching fire.
Spray the aerosol into the intake manifold only when the engine rotates. When the aerosol is properly
used (i.e. in small quantities), it is an efficient starting aid. Excessive use may lead to engine damage
and the warranty does not cover such damage!
To avoid the risk of fire never use starting
aerosol and the Thermostart device simultaneously. Disconnect the cable from the glow
plug and isolate the cable connector.

WARNING

Warming up the engine

Since the engine wear is greatest when the engine is running cold, warm up the engine quickly with a
light load for a couple of minutes after starting. However, you must not load the engine heavily and the
rotation speed must not exceed 2000 rpm when the engine temperature is below 50C.
8

INST.
LIGHTS

STOP

20

10

bar

ENGINE HOURS

0 0 0 5, 0 2

min--- 1
x100

3
1. Coolant temperature gauge
2. Oil pressure gauge
3. Tachometer/hour counter
4. Ignition key

1012 14 16

volt

30
40

2--- 23

5. Voltage gauge
6. Stop button
7. Charging indicator
8. Switch for instruments light

Operation and Driving

22

ATTENTION DURING OPERATION

2,5---4 bar

--- Check the engine oil pressure

running speed 2,5...4 bar
idling speed min. 1 bar

bar

75---90 C

--- Check the coolant temperature

normal running temp. 75...90C

40

100

120

C
2--- 24

--- Watch the ammeter reading/warning light

NOTE!

--- If the engine is overheated, cool it slowly down by idling for a few minutes.
Never pour cold coolant into a hot engine!
Never remove the 2---way thermostat to reduce the temperature. In that case a greater
quantity of the coolant is circulating via the by---pass pipe and the temperature is getting
higher than before.

It is dangerous to open the cap of the pressurised hot radiator.

WARNING

NOTE! Avoid long periods of idling because then the temperature of combustion is reduced. This
causes incomplete combustion and carbon formation which may seize the nozzles and clog the valves
and piston rings.

STOPPING
--- Move the speed lever into idling position.
--- Never stop the engine immediately after heavy driving. Let it idle for a few minutes to
equalize the temperatures. This applies especially to a turbocharged engine.
--- Turn the stop lever into stopping position or push the stop button.
--- Switch the current off. Do not switch the current off while the engine is running.
--- In winter move the stop lever into drive position immediately after the engine is stopped
(to ensure the function of the automatic cold start device of the engines without the electrical
stop device).

Operation and Driving

23

The engine stops suddenly while running

(engines equipped with electrical stop device)
1

2--- 25

Electrical stop device

1. Solenoid
2. Plunger
3. Regulating rod of the injection pump
If the engine stops when you are running it, the reason for this may be the damage of the solenoid. Take
solenoid away from the injection pump and also remove the plunger inside the solenoid. Adjust the solenoid to its place. If the engine starts now, the solenoid is defective. You may carry on running the engine
but it must be stopped by the stop lever behind the injection pump. Install the new solenoid as soon
as possible.
NOTE! Check the fuse of the solenoid first.
Other eventual running troubles, see cart in page 49.

COUPLING ADDITIONAL EQUIPMENT TO THE ENGINE

Various devices can be coupled to the engine. Be sure that they do not apply constant axial load to the
crankshaft or other drive axles.
NOTE! After assembling the clutch or the gear check the axial play of the crankshaft which should be
0,10...0,35 mm.

Service

24

SERVICE
PERIODICAL MAINTENANCE
One of the most essential preconditions for secure operation of your engine is proper maintenance at
regular intervals. Maintenance costs are low compared to costs caused by negligence.
Maintenance work

WARNING

Always stop the engine before service.

Clean the engine and its surroundings before you start service work.

SERVICE CHART
MAINTENANCE WORK
1.
2.
3.
4.

Check engine oil level

Check coolant level
Check for oil, fuel or coolant leakages
Clean air filter cyclone

5. Drain water trap

6. Clean/change air filter
7. Clean cooling system (from outside)
8. Change engine oil and oil filter
9. Check fan belt tightness1
10. Check battery fluid level
11.
12.
13.
14.

Change fuel filter cartridge

Change prefilter (Stanadyne)
Drain water out of fuel tank
Grease coolant pump

15. Adjust valves

SERVICE INTERVAL/RUNNING HOURS

10 50 300 600 1200 2400
x
x
x
x
x
x
x
x
x
x
x2
x2
x2
x2
x

16. Check and clean injectors

1)
2)

17. Turbocharger and intercooler inspection

in an authorised workshop

AT 4800 h INTERVALS

18. Change coolant

EVERY TWO YEARS

grease spring loaded belt tensioner

or once a year (in the autumn)

Service

25

BASIC SERVICE AFTER THE FIRST 50...100 HOURS OF OPERATION

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.

Check battery fluid level.

Check for fuel, lubrication oil and coolant leaks.
Check tightness of screw and nuts.
Test run.
Check oil pressure/charging.
Check idling speed.
Check max. running speed.
Check turbocharger operation.
Check thermometer operation.
Check stop device operation.
Change engine oil and oil filter.
Adjust valve clearances.
Clean air filter.
Drain water trap.
Change fuel prefilter

SERVICES TO BE MADE DAILY OR AT 10 HOURS INTERVALS

1. Check engine oil level

MAX
MIN

2--- 26

Stop the engine and wait for a few minutes before checking. The oil level should be between the max.
and min. lines on the dipstick. When adding oil, top up to the max. line.
2. Check coolant level
Open the radiator cap carefully. If the coolant is hot,
there is an overpressure in the system.

WARNING

The coolant level should be slightly above the radiator core.

The coolant level should be between the MAX and MIN lines if the system is provided with an
expansion tank.

Service

26

Check the freezing point of the coolant before the cold season.
NOTE! Never use only water as coolant. The hot engine can be damaged if you pour cold coolant into
it.
3. Check for leakages (fuel, oil, coolant)
Find any leakage points and eliminate then as soon as possible. The coolant pump is provided with a
draining hole on the underside. This hole must not be blocked. If coolant drips out of the hole, the coolant pump must immediately be repaired. There may be a slight leakage on a new pump before it has
been run in.
4. Clean air filter cyclone
Always stop the engine before cleaning. Undo the locking clamp or the nut on the cyclone, empty and
clean the glass bowl. Refit the glass bowl.

MAX

UP

C
2--- 27

Service

27

SERVICES TO BE MADE WEEKLY OR AT 50 HOURS INTERVALS

5. Check the water trap

OFF ON

Water trap (CAV)

Fuel filter/Water trap (Bosch)

2--- 28

Prefilter/Water trap (Stanadyne)

Open the drain plug and drain any water which may be collected in the water trap/prefilter. Wipe off any
fuel which may have run down.
6. Clean/change the air filter
Always stop the engine before cleaning/changing.
Unscrew the nut at the end of the air cleaner or undo the locking clamps and take out the filter element.
If the air filter is equipped with a safety filter element do not take it out but change it at 1200 h intervals.

2--- 29

Clean the filter element with compressed air with a max. pressure of 5 bar which should be directed
obliquely from the middle of the filter and outwards.

Service

28

Hold the filter against the light, or lower an electric light down through the filter and check that there are
no holes or cracks. If faulty, the filter element must be changed.
When you fit the filter element, check that it is properly located, the seals are in good condition and the
sealing surfaces are clean. Do not tighten the nut at the end of the air cleaner too hard.
Engine warranty is valid only when original Sisudiesel air filter elements are used.

ELECTRICAL

MECHANICAL

2--- 30

The air intake pipe may be fitted with a mechanical or electrical service indicator to indicate when filter
cleaning is due. With the electrical service indicator a lamp in the instrument panel will show when service is needed. When the mechanical service indicator turns red the filter element must be cleaned or
replaced. You can reset the indicator by pushing the button at the end of the vacuum indicator.
7. Clean the cooling system
Check and clean the outside of the radiator from time to time. Use compressed air or water spray to
remove dirt and impurities. Avoid too high a pressure.

Service

29

SERVICES TO BE MADE AT 300 HOURS INTERVALS

8. Change engine oil and oil filter

2--- 31

Run the engine until warm. Stop the engine. Remove the draining plug and drain the oil into a suitable
container. When the oil sump is empty, refit the plug. Take the old oil to a suitable disposal point.
The engine may be equipped with an oil draining pump (e.g. marine engines), so use the pump to get
the oil sump empty.
Fill new oil to the prescribed level (upper mark line on dipstick) through the filler hole.
Note the capacity of the oil filter, abt. 0,7 ltr.
Regarding oil grade, see Lubrication Oil Chart, page 46.
Change oil filter
Before removing the oil filter clean the surroundings of it. Use the loop tool to unscrew the old filter. Lubricate slightly the rubber gasket of the new filter and clean the sealing faces. Tighten the new filter by hand.
Wipe off any oil which has run onto the chassis. Start the engine. Do not race. Ensure that no oil is leaking from the filter. Take the old filter to a suitable disposal point.
Engine warranty is valid only when original Sisudiesel oil filters are used.
The breather pipe
Always check that the breather pipe is clean and unclogged at the same time as changing the oil.

Service

30

9. Check fan belt tension

The belt is correctly tensioned, if it deflects abt. 15...20 mm between the belt pulleys with reasonably
hard thumb pressure. A slack, worn or oily belt must be replaced. Always keep a spare fan belt available.

15...20 mm

Tensioning

2--- 32

Slacken the attaching screws and move the alternator outwards until the belt is sufficiently tight. Tighten
the screws.
If the engine is equipped with a spring loaded belt
tensioner, press the spring (e.g. with a suitable
screw + nut) so that the tensioner does not press
the belts. Preform the tensioning as before
shown. Release the spring loaded tensioner.
If the engine is equipped with an air compressor,
the compressor fan is tensioned by a separate
tightening pulley.
Lubricate the grease nipple.

10. Check battery fluid level

2--- 33

The fluid should stand abt. 5...10 mm above the cell plates in the battery.
Top up with distilled water if required. During the cold season it is important that the engine is allowed
to run for a while after topping up with distilled water. This is to avoid the freezing of the water before
it has had time to mix with the battery acid.
Keep the battery clean and dry on the outside. Ensure proper mounting of the battery.
Clean and protect the pole studs and the cable terminals with battery grease.

Never use a naked flame near the battery to check the fluid level.

WARNING

Service

31

SERVICES TO BE MADE AT 600 HOURS INTERVALS

(or once a year, in the autumn)

11. Change fuel filter

Bosch

--- Clean the filter and the surrounding area and

remove the old filter.
--- Lubricate the gasket on the new filter and fit the
filter. Turn 3/4 of a turn after the gasket has
come into contact with the sealing face.
--- Pump fuel with the hand pump until the filter is
full.
--- Bleed the fuel system, see page 37/40.
A = Bleed screw

11. Change fuel filter

2--- 34

CAV

--- Clean the filter and the surrounding area.

--- Empty the fuel filter by opening the plug in the

bottom shield. Let the fuel drop into container,
not onto the soil.
--- Unscrew the screw on the top of the fuel filter.
At the same time support the filter bottom.
--- Clean the glass bowl and the bottom shield.
--- Fit the new seals and reassemble the filter.
--- Pump fuel with the hand pump until the filter is
full.
--- Bleed the fuel system, see page 37/40.
A = Bleed screw

Take the old filter to a suitable disposal point.

2--- 35

Service

32

NOTE! Use of spirits as antifreeze is not useful or recommended at all. It makes the fuel solidify and
weakens the lubricating qualities of the fuel and increases the possibility of corrosion.
Engine warranty is valid only when original Sisudiesel fuel filter elements are used.

12. Change prefilter Stanadyne

--- Clean the prefilter and surrounding area.
--- Open the quick change ring and take out the
filter element.
--- Fit the new element. NOTE! The element will
only go on one way.
--- Turn the quick change ring to ON position until
audible click will be heard.
--- Pump fuel with the hand pump until the prefilter
is full.
--- Bleed the fuel system, see page 37/40.
Take the old filter element to a suitable disposal point.

UNLOCK

LOCK

2--- 36

13. Drain fuel tank

The fuel tank should be cleaned before the winter. Thus you avoid troubles caused by the water in the
fuel system. The best way to prevent condensation is to always keep the fuel tank as full as possible.
--- Empty the fuel tank and rinse it with pure fuel.
--- Fill the fuel tank with fuel for winter conditions.
14. Grease coolant pump
(The pumps fitted with a grease nipple)
Always use heat resistant ball bearing grease (NLG 2) as lubricant. Do not grease the bearings too much
as excessive grease is forced out from the bearing space and may damage the seals. To press twice
with a grease gun is enough.

Service

33

SERVICES TO BE MADE AT 1200 HOURS INTERVALS

15. Adjust valve clearances
The nominal clearance of both inlet and exhaust valves is 0,35 mm. The valve clearances can be
checked regardless of whether the engine is cold or hot. The valve clearances of a certain cylinder can
be adjusted when the piston is at its compression stroke top dead centre.

Engine front end

INLET

320, 620, 634

EXHAUST

420
2--- 37

320 -- engines
Check the valve clearances in the injection order of the engine. Injection order is 1---2---3.
--- Check valves in the 1st cylinder, when the exhaust valve of no. 3 cylinder is completely open (valve
no. 6).
--- Check valves in the 2nd cylinder, when the exhaust valve of no. 1 cylinder is completely open (valve
no. 2).
--- Check valves in the 3rd cylinder, when the exhaust valve of no. 2 cylinder is completely open (valve
no. 4).
420 -- engines
--- Rotate the crankshaft in the running direction until the valves in the 4th cylinder are rocking (exhaust
closes, inlet opens). Check the valve clearance of the 1st cylinder.
--- Rotate the crankshaft by 1/2 of a turn in the running direction so that valves in the 3rd cylinder are
rocking. Check valves in the 2nd cylinder.
--- Continue according to the order of injection:
Injection order

1 2 4 3

Valves rock in cyl. no

4 3 1 2

620/634 -- engines
--- Rotate the crankshaft in the running direction until the valves in the 6th cylinder are rocking (exhaust
closes, inlet opens). Check the valve clearance of the 1st cylinder.
--- Rotate the crankshaft by 1/3 of a turn in the running direction so that valves in the 2nd cylinder are
rocking. Check valves in the 5th cylinder.
---Continue according to the order of injection:
Injection order

1 5 3 6 2 4

Valves rock in cyl. no

6 2 4 1 5 3

Service

34

Adjusting

0,35

2--- 39

--- Slacken the locknut on the adjusting screw on the rocker arm.
--- Check the clearance with a feeler gauge and adjust to the correct clearance by turning the adjusting
screw.
--- Tighten the locknut and again check that the clearance is correct.

SERVICES TO BE MADE AT 2400 HOURS INTERVALS

16. Check and clean injectors
In order to ensure trouble---free engine operation the injectors must be kept in first class condition. Imperfect operation of an injector causes for example, lower engine output, greater consumption of fuel,
engine knocking and smoke in naturally aspirated engines.
Remove injectors
--- Clean the injectors, their pipes and surroundings.
--- Detach the injection pipes and the leak---off pipes.
--- Detach the nuts from injectors and remove the injectors. If you can not remove the injector by hand,
use the extractor no. 9051 71300. Cover all the connection points of the injector.
--- Also remove the injector sealing ring from the cylinder head, if not remove with the injector.
Special measuring tools are needed for the injector check. Preferably let Sisudiesel Service Organization check, adjust and clean the injectors.

Service

35

Fitting injectors
--- Ensure that the injector seat on the cylinder head is clean. Install the washer and the rubber ring
around the injector. Replace the old sealing ring on the lower end with a new one.
--- Install the injector to the cylinder head. Then tighten the nuts screwing them by turns, a little at a time
checking that the torques of both nuts are equal all the time. Continue tightening until the final
tightening torque, 15 Nm is reached.
--- Attached the injector pipes and the leak---off pipes.

1
2

Fitting the injector

1. Washer
2. Protective rubber
3. Seal washer

2--- 40

SERVICES TO BE MADE AT 4800 HOURS INTERVALS

17. Check turbocharger play and check that the intercooler cell is clean
(DS/DSI/DW/DWI---engines)
The turbocharger and the intercooler cell service must be entrusted to an expert technician at Sisudiesel
Service.
It is essential to carry out regular engine services to keep the turbocharger in good condition. Special
attention must be paid to the cleanliness of the air filter cartridge and to the engine oil and oil filter change
at recommended intervals. Check regularly that the turbocharger is properly fitted to the exhaust manifold as well as the tightness of the inlet and exhaust manifold jointings. Correct adjustment of the injection equipment is essential for the operation of the turbocharger.
When a new turbocharger is installed, pour abt. 0,2 ltr of pure engine oil into the bearing housing before
attaching the pressure oil pipe. Ensure that no impurities are entering the turbocharger with the oil.

Service

36

SERVICES TO BE MADE EVERY TWO YEARS

18. Change coolant
Change the coolant every two years. This ensures that the anti---corrosive is always active. See page
46 for the quality requirements of the coolant.
At the same time check the tightness and condition of rubber hoses of the cooling system. Renew
broken or damaged hoses before filling the system.

1. Drain plug on radiator

2. Drain plug on cylinder block
3. Drain plug on oil cooler
4. Drain plug on charge air cooler
5. Bleed plug
6. Joint

2--- 41

Drain coolant system

--- Remove the filler cap
--- Remove the draining plugs on the radiator and on the left side of the cylinder block.
--- If the engine is equipped with an oil cooler and an intercooler (DSI/DWI), also remove the draining
plugs on them.
--- Make sure all coolant is drained out and no impurities are blocking the draining hole.
--- The engine assembly may also have other draining plugs (e.g. on the engine heater piping). Also
remove these plugs when you change the coolant.
Draining cooling system of marine engine
If you stop the engine in the cold season for so long a time that there is a risk of freezing, always completely drain the raw water system. Ensure also that there is enough antifreeze in the fresh water system.
---------

Drain the fresh water system until the heat exchanger is empty.
Open the covers of the heat exchanger and blow the cell tubes empty.
Open the plate cover of the raw water pump.
Also drain the raw water out of the oil cooler/oil cooler cell tubes of the marine gearbox.

Fill cooling system

Fill the cooling system with a mixture of antifreeze and coolant until the coolant level comes above the
radiator core. Bleed the cooling system by removing the plug/the thermometer feeler on the thermostat
body. Pour coolant until the coolant level reaches the plug. Screw the plug and fill rest of the system.
In DSI/DWI---engines open also the upper joint for the intercooler coolant pipe.
NOTE! Never use only water as coolant.

Additional Service and Adjusting

37

ADDITIONAL SERVICE AND ADJUSTING INSTRUCTION

(to be carried out when required)

BLEED FUEL SYSTEM (Bosch in ---line injection pump)

2--- 43

2--- 42

--- Pump fuel with the handpump on the feedpump.

--- Unscrew the bleed screw on the top of the fuel filter. Pump with the hand pump until the fuel running
out of the bleed screw is free of air bubbles. Close the bleed screw.
--- If the engine fails to start, open the injector pump overflow valve and continue pumping until the fuel
running out is free of air bubbles. Close the overflow valve.
--- Clean the engine of leaked fuel.
Bleed the Thermostart system
Always bleed the fuel pipe of the glow plug, if the pipe or the fuel container is empty e.g. after service.
Damage to the glow plug can occur due to the lack of fuel when starting the engine.
System with magnetic valve
--- Disconnect the glow plug wire and open the
pipe adapter.
--- Switch the current on the magnetic valve and
turn the crankshaft until fuel is running out of
the pipe jointing.
--- Tighten the pipe adapter and connect the wire.

2--- 44

Additional Service and Adjusting

38

System with fuel container

--- If the container has become empty, fill it with a drip can through the breather hole on the cover.
--- Open the glow plug pipe adapter and let fuel drop through the pipe. Tighten the adapter.

CHECK AND ADJUST INJECTION TIMING (Bosch in ---line injection pump)

Injection of the 1st cylinder starts when the mark of the crank shaft pulley shows towards the timing indicator which is either on the right or left side of the pulley depending on the engine type. The tractor engines may have the timing mark located on the flywheel.
NOTE! If you remove the hub of the pulley, mark its location. Afterwards when assembling the pulley
you must ensure that the marks on the hub and on the crankshaft coincide with each other.
Check
The injection pump is equipped with an automatic excess feed. Therefore move the control rod to the
running position before checking the injection timing. Without this action injection timing errors will result!
--- Clean the injection pump and its surroundings thoroughly.
--- Turn the crankshaft to a position where the 1st cylinder reaches its compression stroke top dead
centre. Then turn the crankshaft backwards until the mark on the pulley passes the timing indicator.

9025 99000

2--- 45

--- Remove the control rod cover/the stop magnet from the injection pump. Move the control rod to drive
position with tool 9025 99000.
--- Remove the 1st cylinder injection pipe.
--- Blow the conical part of the pressure valve holder free of fuel. Turn the crankshaft slowly until the fuel
surface in the pressure valve holder stirs but does not yet rise.
--- If the injection time marking on the pulley is in line with the tip of the timing indicator, the injection
timing is correct. Otherwise adjust the timing.
--- After checking and eventual adjustment replace the injection pipe and the control rod cover. Let the
engine run for a few minutes and re---check. Thus you can be sure that there is no air in the fuel system
as this might affect the timing.

Additional Service and Adjusting

39

NOTE! In some types of injection pumps the injection starting point in the 1st cylinder has been positioned with aid of an indicator pin in the pump governor housing. Do the inspection of injection timing
as follows:
--- Turn the crankshaft to a position where the 1st cylinder piston reaches its compression stroke top
dead centre. Then turn the crankshaft backwards until the mark on the pulley passes the timing indicator. After that rotate the crankshaft slowly to running direction until the mark on the pulley is at the point
of the timing indicator.

2--- 46

--- Unscrew the plug on the side of the injection pump. Take out the indicator pin.
--- Turn the indicator pin and push it into the hole so that the groove at the end of the pin points towards
the pump.
--- If the pin groove fits on the boss on the governor weight assembly, the injection timing is correct.
Otherwise, turn the pump to a position where the boss and the pin groove align.
NOTE! Do not rotate the crankshaft when the groove end of the pin is inside the pump, since the pin
end damages easily and plastic pieces remain in the governor housing.
--- When the adjustment is correct, turn the indicator pin so that the groove points outwards (running
position) and push the pin into the hole. Refit the plug.
Injection timing adjustment

2--- 47

--- Loosen the retaining nuts of the injection pump and the connection nuts of the injection pipes.
--- If the injection timing is retarded, turn the injection pump anti---clockwise, direction A (viewed from
the front end of the pump). If the timing is advanced, turn the pump clockwise, direction R.
--- Check the injection timing and turn the pump again, if necessary.
--- When the injection timing is correct tighten the retaining nuts of the pump and the connecting nuts
of the injection pipes.

Additional Service and Adjusting

40

ADJUST IDLING SPEED (Bosch in ---line injection pump)

If the engine idling speed differs from the rating, adjust as follows:

2--- 48

2--- 49

--- Open the protection cap (1) of the idling speed adjusting screw and the protection cap (2) of the
adjusting screw of the additional spring for idling.
--- Ensure that the throttle lever is in idling position and the engine is at running temperature.
--- Start the engine and open the adjusting screw (2) of the additional spring so that it does not affect
the idling speed.
--- Adjust the idling speed by the adjusting screw (1) at abt 20 -- 30 rpm below the rating.
--- Race the engine a few times and ensure that the idling speed remains as set.
--- Tighten the adjusting screw (2) of the additional spring until the idling speed rises to the rated value.
Lock the adjusting screw in this position.
--- Fix the protection caps of the adjusting screws.

BLEED FUEL SYSTEM (Stanadyne rotary injection pump)

NOTE! This fuel system removes automatically small amounts of air bubbles from the filter and the pump
when the engine is running. However, bleed the system always, when the system has been opened or
fuel has been exhausted during driving or a new spare pump has been fitted (to avoid long starting time).

2--- 50

--- Pump by hand the fuel feed pump lever. If the pumping seems to be ineffective, turn the engine a little
so that the camshaft cam is not at the feed pump lifter.

Additional Service and Adjusting

41

2--- 51

--- Loosen the bleeding screw (A) on the filter. Pump with the hand pump until no air bubbles flows out
of the bleeding screw hole. Tighten the bleeding screw.
--- Pump further with the hand pump and loosen the fuel inlet connection (B) on the pump, until the fuel
coming out is free from air bubbles. Tighten the connection.
--- Start the engine and assure, that no leaks exist.
NOTE! When the bleeding is done in this way, fuel flows immediately into the internal transfer pump
when the starter motor is rotating and the distributor pump housing is filled quickly with fuel. In the pump
housing there is a stop solenoid, which must not be switched on for longer periods when the pump
housing is empty of fuel.

CHECK AND ADJUST INJECTION TIMING (Stanadyne rotary injection pump)

2--- 52

--- Turn the crankshaft to a position where the 1st cylinder piston reaches its compression stroke top
dead centre. Then turn the crankshaft backwards until the mark on the pulley passes the timing indicator. After that rotate the crankshaft slowly to running direction until the mark on the pulley is at the point
of the timing indicator.

Additional Service and Adjusting

42

2--- 53

--- Remove the small cover plate on the side of the injection pump. If the pump timing marks are against
each other, the timing is correct.
--- If the pump timing marks are not against each other, loosen the retaining nuts of the pump and the
delivery pipes. Rotate the pump to a position where the timing marks are against each other. Tighten
the injection pump into position where the timing marks on the engine and on the injection pump are
against each other. Tighten the connecting nuts of the delivery pipes.
NOTE! The E---engine timing check and adjustment is done with special gauges. Contact your Sisudiesel dealer.

ADJUST LOW IDLING SPEED (Stanadyne rotary injection pump)

2
1

1. Low idling speed

2. Revolution lever
3. Max. revs

2--- 54

The low idling speed can be adjusted with a limiting screw in front of the revolution lever. The adjusting
screw for max. revs has been sealed. This adjustment has been done in the factory, and adjustment of
max. revs afterwards is prohibited.

Additional Service and Adjusting

43

FIT CYLINDER HEAD

max. 142

max. 188,5

2--- 55

--- Measure the screw length which should be within the limits shown in figure. If any screw differs in
length from the measures given, replace the screw.
--- Fit the cylinder head in its position.

14

10

16

12

320, 620, 634

15
17

21

19

22

12
10

8
11

13

20

18

420

11

14

9
5

17
16

13

15

2--- 56

--- Pictures above show the correct tightening order of the cylinder head bolts. The order has also been
marked on the cylinder heads.
--- Tighten the cylinder head bolts progressively as follows:
1. First tightening to 80 Nm
2. Tightening of 90
3. Tightening again of 90.
--- Adjust the valve clearances.
--- Run the engine with a light load to the normal running temp. (~ 75C).
--- Tighten the bolts 60 and adjust the valve clearances.
NOTE! After this the cylinder head does not need retightening.

Additional Service and Adjusting

44

INSPECTION OF THE ZINC PLUG

(620/634 marine engines)

20

Check the zinc plug atleast once every year. If the

zinc plug is badly corroded, the inspection must
be made more often. The extent of corrosion depends on the chemical contents of the water flowing through the system.

14

--- Empty the raw water system and loosen the

zinc plug.
--- Clean the zinc plug by scraping.
--- Change the plug if it has worn more than to half
of a new plug, compare with dimensions shown
in picture. Spare part no 8450 85699.

2--- 57

CHECK OF THE RUBBER ELEMENT

VIBRATION DAMPER

A
1,5

(620/420 -- engines)
The inertia member of rubber vibration damper
on the crankshaft front end may turn in relation to
its hub in the course of hundreds of running
hours. There are index lines on the front surface
of the vibration damper, where possible turning
can be noticed.
--- If lines (A) are more than 1,5 mm out of alignment, change the vibration damper for a new
one.

2--- 58

--- Check also the condition of rubber element. If

pieces of rubber are missing, or if the rubber
member is more than 3,5 mm below the surface,
or if forward movement of inertia member (outer
ring) can be detected, change the vibration
damper for a new one.
NOTE! Vibration damper should be replaced
every 4000 running hours!

2--- 59

Additional Service and Adjusting

45

BEFORE THE COLD SEASON

--- Drain water out of the fuel tank.
--- Drain water out of the water trap.
--- Replace the fuel filter and prefilter (Stanadyne).
--- Ensure that the fuel in the fuel tank is of winter quality.
--- Change the engine oil (winter quality).
--- Check the battery condition.
--- Move the control rod to the running position after the engine has been stopped (engines without
electrical stop device).
--- Ensure that the fuel in Thermostart fuel container and in the fuel pipe between the container and the
glow plug is of winter quality. If there is fuel of summer quality, it becomes solid and the glow plug
is glowing without fuel. The result is that the engine fails to start and the glow spiral is burnt off. The
easiest way to change the fuel in the Thermostart container: Remove the fuel pipe at the glow plug
end and let the container drip empty. After this replace the fuel pipe and fill the container e.g. with a
drip can through the bleed hole on the container. Remove the fuel pipe carefully to ensure that the
glow plug gets fuel. Thus also the fuel pipe becomes air free.
--- Check externally by hand the glow plug function when the glow plug is fitted and the glowing current
is switched on. If the glow plug is working, it is warm on the top.
--- Check the function of the engine pre---heater.

TIGHTENING TORQUES
Object

Nm

Cylinder head bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 Nm+90+90

Cylinder head studs to cylinder block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Main bearing bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Connecting rod bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Nm + 90
Crankshaft nut:
--- 320/420 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600
--- 620/634 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000
Crankshaft pulley bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Flywheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
Flywheel housing bolts:
--- outer ring M12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
--- inner ring M10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Idler gear bolts:
--- M10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
--- M14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Idler gear retaining screws (with ball bearing):
--- the bigger bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
--- the bolts for holding the bearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Balancing weights (420) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Piston cooling valve (620/634) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Oil pump retaining screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Oil cooler connecting piece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Coolant pump pulley nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Exhaust manifold bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Intake manifold bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Injection pump pressure valve holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Injection pump gear retaining nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Injection pump gear retaining nut (Bosch---P) . . . . . . . . . . . . . . . . . . . . . . . . 200
Injector attaching nuts (on studs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Injector nozzle sleeve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Compressor pulley nut (Knorr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Additional Service and Adjusting

46

LUBRICATING OIL QUALITY REQUIREMENTS

--- Naturally aspirated and
turbocharged engines
--- Low emission (E) engines

API CF -- 4, CG -- 4, CH -- 4
API CG -- 4, CH -- 4

ACEA E2/E3 -- 96, E4 -- 98, E5 -- 99

ACEA E3 -- 96, E4 -- 98, E5 -- 99

TEMPERATURE C

SAE---GRADE

---40

---30

---20

---10

+10

+20

+30

+40

5W---30
5W---40
10W---30
10W---40
15W---40
20W---20
20W---40
30
2--- 60

Lubricating oil is hazardous to health. Avoid prolonged contact with

the skin. The oil mist is dangerous to inhale.

WARNING

COOLANT QUALITY REQUIREMENTS

The coolant which is used must satisfy the demands of standard ASTM D 3306 or BS 6580:1992.
--- The cooling mixture must consist 40...60 % of ethylene/propylene---glycol based antifreeze and water.
The best proportion is 50 % of antifreeze liquid and 50 % of water.
--- The water used must be mechanically clean and not too acid (e.g. swamp water) or too hard
(calciferous well water).
--- Check periodically the proportion (the frostproof) of the coolant. Change the coolant every two years.
NOTE! Never use only water as coolant!
Antifreeze is hazardous to health. Avoid contact
with the eyes and skin.

WARNING

Additional Service and Adjusting

47

FUEL QUALITY REQUIREMENTS

Density, +15C

Requirement

Test method

0,82...0,86 kg/dm3

ASTM D 4052, EN ISO 12185

mm2/s

ASTM D 445, ISO 3104

Viskosity, +40C

1,2...4,5

Sulphur content

max. 0,2 % m/m

ASTM D 4294, ISO 8754

Cetane index

min. 45

ASTM D 4737

Water content

max. 200 mg/kg

ASTM D 1744

The fuel should be according to norm EN 590.

Engine output depending on fuel quality
Different fuel qualities like temperature, density
and viscosity affect the actual output of the engine. Our output rates use fuel with a density of
0.84 kg/dm3 and specific heat rate of 42,7 Mj/kg
at a fuel temperature of +15C.

OUTPUT %
+5

The correction in % caused by the change of fuel

qualities is seen in the attached figures.
---5

OUTPUT %
+5

0,84
0,90
0,85
DENSITY kg/dm3

0,80

FIG. B. Engine output dependence on fuel density. Normal value is 0,84 kg/dm3 at +15C.
OUTPUT %
+5

C
---5

35
10

20

30

40

50

60

FUEL TEMPERATURE C

FIG.A. Engine output dependence on fuel temperature. +35C is the reference temp (correction 0 %).
The fuel temperature is not only a function of
ambient conditions but also varies according to
the fuel system of the application (tank size and
location, return flow etc.).

0
---2
2

7
8
6
VISCOSITY cSt

FIG. C. Engine output dependence on fuel viscosity. Normal value is 3 cSt at +20C.

Additional Service and Adjusting

48

Note fig. B and C only if the fuel quality is changed.

In fig. A there are all the quality dependencies caused by the change of the temperature. The fuel density
and viscosity can be seen in the produce declaration given by the manufacturer.
The output correction is made as follows: Correction percentages from figures A, B and C are summed
up. The given rated power is then corrected with the resulting percentage.

BIODIESEL FUEL
In the Sisudiesel---engines it is accepted to use esterified rape oil as biodiesel fuel---or RME (rape oil
esterified with metanol) without technical modifications on the engine. The requirement for the acceptance is that the biodiesel that is used is very pure and that is fills the Austrian 1190 biodieselnorm
demands of pureness. Practically it means that the amount of pure carbon, hydrogen and oxygen content together in the biodiesel is more than 99%.
The warranty forms are the same.
In the service instructions there is one thing changing: checking cleaning of nozzles every 1000 hours.

Additional Service and Adjusting

49

TROUBLE SHOOTING
Always listen to engine noise and pay attention to how it operates. Eliminating a slight fault often prevents a more serious one.
Troubles and their causes

Troubles and their causes

A. ENGINE CANNOT BE CRANKED

D. ENGINE DOES NOT RUN SMOOTHLY

1. Loose or broken wire.

2. Battery discharged. This may be
due to a slackened or broken
alternator belt.
3. Starter defective.
B. ENGINE FAILS TO START
1. Fuel tank empty. Fill the tank and bleed
the fuel system.
2. Fuel not fluid enough in cold weather
(summer quality).
3. Air in injection pump, pipes or injectors.
4. Leak in fuel inlet or delivery pipe.
5. Clogged fuel filter or pipe.
6. Faulty injectors1.
7. Feed pump inoperative1.
8. Retarded injection timing.
9. Low compression1.
a) leaky valves
b) piston rings sticking
c) cylinder head gasket damaged
d) broken valve spring
10. Cold start device defective.
11. Leak---off valve defective.
12. Stop lever not in drive position.
13. Faulty stop solenoid.
C. ENGINE STARTS BUT STOPS AFTER
A SHORT WHILE
1.
2.
3.
4.
5.
6.

Air in injection pump, pipes or injectors.

Fuel strainer in fuel tank air pipe clogged.
Clogged fuel filter or pipe.
Clogged water separator.
Feed pump defective1.
Faulty stop solenoid.

1.
2.
3.
4.
5.
6.
7.

Air in injection pump, pipes or injectors.

Clogged fuel filter or pipe.
Leak in fuel inlet or delivery pipe.
Injectors defective1.
Low compression (see B 9 a---d)1.
Feed pump defective1.
Injection pump or governor defective1.

E. ENGINE DOES NOT DEVELOP FULL POWER

1. Air filter clogged.
2. Speed control linkage incorrectly adjusted.
Loose linkage.
3. Air in fuel system.
4. Clogged fuel filter, prefilter, water separator
or fuel pipe.
5. Injectors defective1.
6. Leak in fuel inlet or delivery pipe.
7. Incorrect injection timing.
8. Feed pump defective1.
9. Low compression (see B 9 a---d)1.
10. Injection pump or governor defective1.
11. Turbocharger defective1
(turbocharged engine).
12. Leak---off valve defective.
13. Stop lever not properly in drive position.
F. ENGINE KNOCKING
1.
2.
3.
4.
5.

1)

Incorrect fuel.
Injectors defective1.
Advanced injection timing.
Low compression (see B 9 a---d)1.
Excessive bearing clearance1.

Consult an expert technician

Additional Service and Adjusting

Troubles and their causes

Troubles and their causes

G. SMOKE OR SOOT IN EXHAUST GASES

I. ENGINE TENDS TO RACE OR FAILS TO

MAINTAIN ITS STANDARD SPEED

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Engine running too cold.

Engine has been idling for too long.
Air filter clogged.
Incorrect fuel.
Engine oil level too high.
Leak in fuel pipes.
Clogged fuel filter, water
separator or fuel pipe.
Injectors defective1.
Incorrect injection timing.
Low compression (see B 9 a---d)1.
Injection pump or governor defective1.
Turbocharger defective1.

H. ENGINE OVERHEATS
1. Slack or broken fan belt.
2. Cooling system not completely filled.
System clogged.
3. Thermostat defective or removed
(double---acting thermostat).
4. Thermostat upside down.
5. Radiator filler cap not pressure tight.
6. Overloading.

50

1. Governor defective1.
J. OIL PRESSURE TOO LOW
1.
2.
3.
4.
5.
6.
7.

Engine has run short of oil.

Impurities in control valve.
Incorrect SAE grade of oil.
Oil too hot.
Excessive bearing clearance1.
Idling speed too low.
Sensor for oil pressure gauge or indicator
lamp defective.
8. Oil pressure gauge shows incorrect reading.
9. Oil filter clogged.
10. Oil diluted by fuel.

1)

Consult an expert technician

Additional Service and Adjusting

51

STORING THE ENGINE

If the engine is to be stored for the winter period or is left unused for a long time, take the following
measures:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

Clean the engine externally.

Clean the fuel tank and water separator.
Replace the fuel filter and prefilter (Stanadyne).
Replace (or clean) the air filter.
Add about 5 ltr of fuel into the fuel tank and bleed the fuel system.
Run the engine until it reaches its normal running temperature.
Replace the oil filter.
Change the engine oil.
Ensure that coolant---antifreeze mixture is strong enough (add antifreeze, if necessary). Drain the
raw water (= sea water) cooling system in marine engines as described earlier.
Remove the injectors and check their condition.
Pour equal quantities of pure engine oil into the cylinders through the injector holes (use about 0,05
ltr for each cylinder) and crank the engine a few revolutions with the stop lever engaged. The oil
will now spread on the cylinder walls.
Attach the injectors again. Fit new seal rings.
Disconnect the battery and ensure that it gets proper attention (storage).
Clean the cable lugs and coat the exposed surfaces with protective oil (with CRC or with grease).
Remove the v---belts and apply grease to the pulleys and other engine parts which might rust.
Protect the air cleaner and exhaust pipe openings as well as the electrical equipment and the
instrument panel with plastic.
Fill the fuel tank with gas oil.

AFTER---STORAGE ATTENTION
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.

Clean the engine to remove protective grease.

Remove the plastic covers.
Carefully turn the fan back and forth to release the coolant pump seal (if stuck).
Fit the v---belts and adjust their tension.
Check the coolant level.
Remove the rocker cover and lubricate the valve mechanism with engine oil.
Check the engine oil level.
Open slightly the draining plug of the fuel tank and drain condensed water if present.
Bleed the fuel system.
Check all electrical wires and make any necessary repairs. Clean the terminals.
Pour about 0,2 ltr of pure engine oil into the turbocharger bearing housing (turbocharged engines).
Connect the battery, fully charged, in place.
Start the engine.
Watch the oil pressure and alternator warning lights.
Check for any coolant, oil or fuel leaks and make repairs as necessary.