Plate 106-1

MAN B&W Chain Edition 0047

Data Data 1 (2)

SAFETY PRECAUTIONS
Special
D10601 Data 0047
106-1 Edition S70MC-C
Chain

X Stopped engine
X Block the starting mechanism
X Shut off starting air supply
X Engage turning gear
Shut off cooling water
Shut off fuel oil
X Shut off lubricating oil
Lock turbocharger rotors

Data
Ref. Description Value Unit

D06-18 Teeth on chain wheel, max. wear 4 mm

D06-19 Original length (chain pitch x 10 links) 1143 mm
D06-20 10 links measurements + 1% of a tensioned chain = scrapping of 1154,4 mm
chain
 Plate 106-1
MAN B&W Chain Edition 0047
Data Data 2 (2)

The task-specific tools used in this procedure are shown on the plates at the end of this chapter or in the
chapters indicated by the first three digits in the plate number, e.g. P90951 refers to chapter 909.

Plate Item No. Description

P90651 70 Chain assembling tool

P90651 81 Chain disassembling tool
P91356 Lifting Tools, etc.
 Plate 906-1.1
MAN B&W Chain Edition 0234
Checking Page 1 (4)

Chains
S70MC-C
0234
Checking
906-1.1

Carry out the inspection as follows:

1. Make a general inspection for loose bolts

and screws.

2. Inspect lube oil pipes for damage, and

check jet nozzles for possible stoppages or
deformations.

3. Examine the rubber track of the guideways

for cracks or other damage.

Replace the guideway if bits have started to

be “plucked out” of the rubber track.

4. Check the teeth of the chain wheels. If ab-

normal wear is found, take a measurement
(see Data).

Measurements are best taken by placing a

short straight-edge over points A and B and
then measuring the distance D06-18.

5. If abnormal wear is observed at the bottom

of the teeth, make a drawing in scale 1:1 of
the teeth and wear profile.

For assessing the measurement results,

contact MAN B&W Diesel.

In most cases, scratches caused by the

side plates of the chain will be found on the
sides of the teeth. Such scratches can gen-
erally be considered normal.
 Plate 906-1.1
MAN B&W Chain Edition 0234
Checking Page 2 (4)

6. The chains for the camshaft drive are

matched together to ensure an even load
distribution.

To keep such matching chains in their pairs,

the side plates of the outer link nearest to
the assembled link have been marked with
year, month, day and chain number.

Example:

No. 1 order,
840520 1A
840520 1B
(840520 1C, possible 3rd chain)

No. 2 order,
840520 2A
840520 2B
(840520 2C, possible 3rd chain)

On the same links there is an arrow (–>)

which indicates the mounting direction.

Check the chains for cracks on possibly de-

fective rollers and side plates.

Check that the chain rollers can run freely

and that the chain links can freely move on
the pin and bushing (that they are not
“seized” between the pin and the bushing).

It is normal, however, that the rollers get

light, circumferential scratches during the
running-in period. These fine scratches are
of no importance and need not be consid-
ered.

It is recommended that each single link is

checked.

7. Check chain wear by measuring the length

of 10 chain links. Use two master squares
and a steel measuring tape as shown on
the sketch. Compare the result with the val-
ues given in Data.

If necessary, adjust the chain tightener.

See Procedure 906-2.3.
 Plate 906-1.2
MAN B&W Chain Edition 0234
Dismantling Page 3 (4)

Dismantling
906-1.2

It may become necessary to disassemble

the chain if, for instance, cracked rollers or
seizures between pin and bushing have
been discovered during the inspection.
See Procedure 906-1.1.

Note!

Every time a chain link is disassembled,

a new link must always be fitted as the
link pin press-fit is destroyed when
breaking the chain.

When a new link is fitted in one chain, the

corresponding link in the other chain
must also be renewed.

1. Remove the tension on the chain by loos-

ening the chain tightener.
(See Procedure 906-2.3).

Turn the engine until the slack part of the

chain, with the chain link that is to be dis-
assembled, is in a favourable position for
the work. If the engine is equipped with bal-
anceweights, continue the turning until the
balanceweights are hanging vertically
downwards, as shown in the sketch.

2. Mount a wire round the link rollers a short

distance from the disassembly point, and
tighten the wire lightly with a tackle.

Protect the link rollers over which the wire

is wrapped.

Note!

If the chain is to be completely removed,

contact MAN B&W Diesel for further
information.

The riveting of the pins that are to be

pressed out is to be chiselled or ground
away.

3. Place the chain bursting tool over the outer

chain link, and dismantle the link by alter-
nately tightening the screws on the tool.
 Plate 906-1.4
MAN B&W Chain Edition 0234
Mounting Page 4 (4)

Mounting
906-1.4

Before assembling the inner and outer

links, clean the pins and bushings.

1. Combine the inner chain link with the outer

chain link and mount the compression tool.

Force the loose side plate of the outer link

into place by alternately tightening the
screws on the compression tool.

2. When the link has been assembled, remove

the compression tool and lock the pin ends
by riveting.

Repeat this procedure until the chain has

been assembled.

Remove the tackle and wire and adjust the

chain tension.
(See Data and Procedure 906-2.3).
 Plate 906-1
MAN B&W Check Tightening Bolt of Spray Pipe Joints
Edition
(L70MC-C) Page 1 (1)

Size Tightening torque

To be checked
M8 17 Nm
M10 35 Nm
M12 50 Nm
M14 80 Nm
M16 135 Nm
M18 190 Nm
M20 260 Nm
BLANK
 Plate 106-2
MAN B&W Chain Tightener Edition 0045
Data Data 1 (2)

SAFETY PRECAUTIONS
Special Edition
S70MC-C
D10602
106-2 Data 0045 Chain Tightener

X Stopped engine
X Block the starting mechanism
X Shut off starting air supply
X Engage turning gear
Shut off cooling water
Shut off fuel oil
X Shut off lubricating oil
Lock turbocharger rotors

Data
Ref. Description Value Unit

D06-21 Tightening angle = 4.5 hexagons 270 °

D06-25 Mechanical or blocked chain tightener, clearance 0.1 mm
 Plate 106-2
MAN B&W Chain Tightener Edition 0045
Data Data 2 (2)

The task-specific tools used in this procedure are shown on the plates at the end of this chapter or in the
chapters indicated by the first three digits in the plate number, e.g. P90951 refers to chapter 909.

Plate Item No. Description

 Plate 906-2.3
MAN B&W Chain Tightener Edition 0231
Adjustment Page 1 (2)

Chain Tightener
S60MC-C
0231
Adjustment
906-2.3

1. To retighten the chains, loosen nuts A, B,

C and D to free the chain tightener bolt.

2. Turn the engine so that the slack part of the

chains is on the same side as the tightener
wheel.

If the engine is equipped with flyweights,

continue turning until the flyweights are
hanging vertically downwards.

3. Tighten nut B on the chain tightener bolt

until there is a clearance between the shaft
and the nut as stated in D06-25.

Then tighten nut B as stated in D06-21 (see

Data).

For chain wear, see Procedure 906-1.1.

 Plate 906-2.3
MAN B&W Chain Tightener Edition 0231
Adjustment Page 2 (2)

4. Tighten nut C hard against the contact face

of the shaft.

Tighten nut D.

Lock nuts C and D with the tab washer.

5. Tighten nut A.

Lock nuts A and B with the tab washer.

The number of times that retightening can

be carried out depends on when the limit for
scrapping the chain has been reached. See
Data page 106-1.
 Plate 106-3
MAN B&W Camshaft Edition 0033
Data Data 1 (2)

SAFETY PRECAUTIONS
Special Edition
D10603
106-3 Data 0033 Camshaft

X Stopped engine
X Block the starting mechanism
X Shut off starting air supply
X Engage turning gear
Shut off cooling water
X Shut off fuel oil
X Shut off lubricating oil
Lock turbocharger rotors

Data
Ref. Description Value Unit

D06-27 Max. permissible change in lead angle 2 °

D06-28 corresponding to 5.3 mm
D06-29 Pin gauge for top dead centre of crankthrow No.1, 1007.6 mm
check measurement
D06-30 Pin gauge for camshaft, check measurement 479 mm
 Plate 106-3
MAN B&W Camshaft Edition 0033
Data Data 2 (2)

The task-specific tools used in this procedure are shown on the plates at the end of this chapter or in the
chapters indicated by the first three digits in the plate number, e.g. P90951 refers to chapter 909.

Plate Item No. Description

P90664 Crankshaft - Pin Gauge

P90668 Camshaft - Pin Gauge
 Plate 906-3.1
MAN B&W Camshaft Edition 0214
Checking Page 1 (3)

Camshaft
S46MC-C
0214
Checking
906-3.1

1. Turn the crankthrow for cylinder 1 to TDC.

Turn in the AHEAD direction to ensure that

the tension of the chain on the chain drive
is correct. If necessary, adjust the chain
tension.
See Procedure 906-2.3.

Check the TDC of cylinder 1 against the

mark on the turning wheel.

2. Check the TDC position with the pin gauge

on the crankthrow.
 Plate 906-3.1
MAN B&W Camshaft Edition 0214
Checking Page 2 (3)

3. Position the camshaft pin gauge in the cen-

tre punch mark, and measure the deviation,
if any, in lead angle.

For max. permissible change, see Data.

4. Check and, if necessary adjust the cylinder

lubricator. See Procedure 903-2.1.

Check the setting of the starting air distrib-

utor. See Procedure 907-1.1.

5. When checking the camshaft position, also

check the running surface of the cams.

As the inspection must include the entire

surface of the cam, the cam should be
turned one complete revolution during the
inspection.

The running surface of the cam must be

completely smooth and bright.

6. If light scratches are ascertained, remove

them by carefully polishing the cam in the
direction of rotation with a fine carborun-
dum stone. Such light scratches can appear
if the roller guide and the cam are not cor-
rectly aligned.

In the event of heavier scratches or direct

flaking of the material on the running path,
MAN B&W Diesel should be contacted for
further instructions.
 Plate 906-3.3
MAN B&W Camshaft Edition 0214
Adjustment Page 3 (3)

Adjustment
906-3.3

1. If the chains prove to be so heavily worn

that the deviation between the measuring
points and the pin gauge has reached the
maximum value stated in Procedure 906-
3.1, MAN B&W Diesel should be contacted
for further instructions.
BLANK
 Plate 106-4
MAN B&W Camshaft Bearings Edition 0036
Data Data 1 (2)

SAFETY PRECAUTIONS
Special Edition
L70MC-C
D10604
106-4 Data 0036 Camshaft Bearings

X Stopped engine
X Block the starting mechanism
X Shut off starting air supply
X Engage turning gear
Shut off cooling water
Shut off fuel oil
X Shut off lubricating oil
Lock turbocharger rotors

Data
Ref. Description Value Unit

D06-31 Screws for bearing cap, tightening torque 345 Nm

D06-33 Clearance between cap/bearing housing 3±0.3 mm
D06-34 Bearing shell, max. wear 0.1 mm
D06-37 Camshaft bearing cap 32 kg
D06-65 Bearing shell, minimum thickness 10.3 mm
 Plate 106-4
MAN B&W Camshaft Bearings Edition 0036
Data Data 2 (2)

The task-specific tools used in this procedure are shown on the plates at the end of this chapter or in the
chapters indicated by the first three digits in the plate number, e.g. P90951 refers to chapter 909.

Plate Item No. Description

P90651 152 Hydraulic jack for lift of camshaft

P90651 164 Lifting attachment for camshaft bearing
P91351 22 Hydraulic pump, hand operated
P91351 58 Hose with unions (3000 mm), complete
P91359 Torque Spanners
P91366 58 Feeler gauge
P91366 61 Slide caliper
 Plate 906-4.1
MAN B&W Camshaft Bearings Edition 0221
Checking Page 1 (6)

L70MC-C
0221
Camshaft Bearing
Checking
906-4.1

1. Dismount the inspection covers from the

front of the camshaft housing.

Check for wiped-out metal at the bearing

ends, and for fragments of metal in the
camshaft housing.

In the event of any signs of anomalies, the

bearing shell must be dismantled for closer
investigation and, if necessary, the bearing
shell must be replaced.

If no anomalies are found during the visual

inspection, dismantling need only be car-
ried out in connection with Class surveys.
 Plate 906-4.2
MAN B&W Camshaft Bearings Edition 0221
Dismantling Page 2 (6)

Dismantling
906-4.2

Caution!

Before dismantling any camshaft bear-

ings, the main chain must be relieved of
tension by loosening the chain tightener
to avoid damaging engine parts.
See Procedure 906-2.3.

1. Remove the inspection covers from the

camshaft housing. Remove and discard the
gaskets.

Dismount the plug screws from the base-

plate above the bearing in question.

Lift the roller guide of the exhaust valve hy-

draulic pump. See Procedure 908-7.

2. Dismount the lubricating oil connecting

pipe.

Using a socket spanner mounted on an ex-

tension, loosen the bearing cap screws
through the outer holes in the baseplate.

3. Through the middle hole in the baseplate,

screw the centre rod of the lifting tool into
the bearing cap.

Use the lock nut on the lifting tool to lift the

bearing cap clear of the camshaft.
 Plate 906-4.2
MAN B&W Camshaft Bearings Edition 0221
Dismantling Page 3 (6)

4. Place the hydraulic jack in the camshaft

housing in front of the fuel cam.

Place a dial gauge on the camshaft, and lift

the camshaft 0.30 mm.

5. Press lightly on the upper edge of the shell

to turn the shell up over the camshaft.

Remove the shell from the camshaft hous-

ing.
 Plate 906-4.3
MAN B&W Camshaft Bearings Edition 0221
Overhaul Page 4 (6)

Overhaul
906-4.3

1. For assessment of the bearing condition,

see Volume I OPERATION, Chapter 708
‘Bearings’.

Inspect the entire surface of the bearing

journal for seizures.

If seizures are found on the bearing journal

surface (on account of bearing breakdown),
polish the surface with a fine carborundum
stone to re-establish a bright and smooth
surface.

By closely examining the sliding surface of

the bearing shell visually, an impression
can be formed of whether the lubrication of
the bearing surface has been insufficient or
entirely missing. Normally, camshaft bear-
ing damage only occurs due to faulty lubri-
cation.

Measure the thickness of the bearing shell

with a micrometer to check the amount of
wear.
 Plate 906-4.4
MAN B&W Camshaft Bearings Edition 0221
Mounting Page 5 (6)

Mounting
906-4.4

1. Clean the bearing journal, the bearing sup-

port and the bearing shell.

2. Coat the bearing shell with oil, mount the

shell on the camshaft, and turn it into place.

Using a caliper at both sides of the bearing

shell, check that the bearing is positioned
absolutely horizontally.

3. Using a caliper at both sides of the bearing

shell, check that the bearing is positioned
absolutely horizontally.

4. Lower the camshaft and remove the dial

gauge and the hydraulic jack from the en-
gine.

5. Lower the bearing cap on to the camshaft.

Remove the lifting tool from the bearing
cap.
 Plate 906-4.4
MAN B&W Camshaft Bearings Edition 0221
Mounting Page 6 (6)

6. Mount the bearing cap screws.

Tighten both screws lightly.

Using a socket spanner mounted on an ex-

tension and a torque wrench, tighten the
screws to the torque stated in Data.

Note!

To ensure that the bearing cap is not

displaced, the tightening must be done
in steps as follows:

1. Tighten the outermost screw

to half the torque stated in Data.

2. Tighten the innermost screw

to half the torque stated in Data.

3. Tighten the outermost screw

to the full torque stated in Data.

4. Tighten the innermost screw

to the full torque stated in Data.

7. Check the clearance between the bearing

cap and the bearing housing.

Mount the lubricating oil pipe on the bear-

ing cap.

Mount the plug screws in the baseplate.

8. Clean the camshaft housing and mount the

inspection covers, fitted with new gaskets.
 Plate 106-6
MAN B&W Replacement of Cams on Camshaft Edition 0008
Data Data 1 (2)

SAFETY PRECAUTIONS
Special Edition
L70MC-C
D10606
106-6 Data 0008 Replacement of Cams on Camshaft

X Stopped engine
X Block the starting mechanism
X Shut off starting air supply
X Engage turning gear
Shut off cooling water
X Shut off fuel oil
X Shut off lubricating oil
Lock turbocharger rotors

Data
Ref. Description Value Unit

D06-47 Exhaust cam screws, tightening torque 1850 Nm

or 100 Nm
+ 35 °
D06-48 Indicator cam screws, tightening torque 150 Nm
D06-49 Fuel Cam screws, tightening torque 2250 Nm
or 100 Nm
+ 50 °
D06-50 Fuel cam, marking scratch 170 mm
D06-51 Fuel cam, axial movement 175 mm
D06-52 Exhaust cam, marking scratch 170 mm
D06-53 Exhaust cam, axial movement 175 mm
 Plate 106-6
MAN B&W Replacement of Cams on Camshaft Edition 0008
Data Data 2 (2)

The task-specific tools used in this procedure are shown on the plates at the end of this chapter or in the
chapters indicated by the first three digits in the plate number, e.g. P90951 refers to chapter 909.

Plate Item No. Description

P90851 173 Lifting tool for exhaust valve roller guide

P91351 22 Hydraulic pump, hand operated
P91351 46 Hose with unions (1500 mm), complete
P91351 58 Hose with unions (3000 mm), complete
P91351 105 3-way distributor block, complete
P91351 201 Quick coupling, male
P91351 225 Disc, round-plain, Cu ø11x3 mm
P91359 Torque Spanners
 Plate 906-6.2
MAN B&W Replacement of Cams on Camshaft Edition 0204
Dismantling Page 1 (7)

Replacement of Cams on Camshaft

S60MC-C
0204
Dismantling
906-6.2

Fuel Cam

1. Remove the front cover of the camshaft

housing.

2. Lift the roller guide from the cam in ques-

tion. See Procedure 909-10.

3. Turn the camshaft so that the marking

scratch can be seen.

4. Extend the marking scratch on the shaft by

D06-50. See Data.
 Plate 906-6.2
MAN B&W Replacement of Cams on Camshaft Edition 0204
Dismantling Page 2 (7)

5. Remove the plug from the cam and mount

gaskets and snap-on connectors instead.

6. Connect the snap-on connectors to the hy-

draulic high-pressure pump.

Apply oil pressure to the cam, using the

high-pressure pump.

When oil seeps out along the cam, press

the cam sideways, in the direction towards
the forward end of the engine.

7. The cam should be moved as stated in

D06-51 to be sure that it gets free of the lin-
er for the roller guide.

8. In case the cam cannot be moved as de-

scribed in item 6, MAN B&W should be con-
tacted for further instructions.
 Plate 906-6.2
MAN B&W Replacement of Cams on Camshaft Edition 0204
Dismantling Page 3 (7)

Exhaust Cam

9. Remove the front cover of the camshaft

housing.

10. Lift the roller guide from the cam in ques-

tion. See Procedure 908-7.

11. Extend the marking scratch on the indicator

drive cam onto the camshaft.

Extend the marking scratch on the exhaust

cam onto the camshaft by D06-52. See Da-
ta.
 Plate 906-6.2
MAN B&W Replacement of Cams on Camshaft Edition 0204
Dismantling Page 4 (7)

12. Dismantle and remove the indicator drive

cam from the camshaft when fitted.

13. Remove the plug from the cam and mount

gaskets and snap-on connectors instead.

14. Connect the snap-on connectors to the hy-

draulic high-pressure pump.

Apply oil pressure to the cam, using the

high-pressure pump.

When oil seeps out along the cam, press

the cam sideways, in the direction towards
the aft end of the engine.
 Plate 906-6.2
MAN B&W Replacement of Cams on Camshaft Edition 0204
Dismantling Page 5 (7)

15. The cam should be moved as stated in

D06-53 to be sure that it gets free of the lin-
er for the roller guide.

16. In the event that the cam cannot be moved

as described in item 14, MAN B&W should
be contacted for further instructions.
 Plate 906-6.4
MAN B&W Replacement of Cams on Camshaft Edition 0204
Mounting Page 6 (7)

Mounting
906-6.4

Fuel Cam

1. Before mounting the two-part spare cam,

the bore and the area on the shaft must be
degreased.

Place the two-part spare cam on the shaft,

mount the four screws, and tighten slightly,
so that the gap between the two parts is
equal at both sides.

2. Make sure that the marking scratches on

the cam and the camshaft coincide, and
that the running surface of the cam is op-
posite the roller.

Tighten the screws just hard enough to

avoid that the cam slips when the roller
guide is lowered onto the cam.

Measure the fuel cam lead (see Procedures

909-1 and 909-3) and adjust if necessary.

Tighten the screws to D06-49 and check

that the gap is still equal at both sides.

Lock the screws with Loctite, type 242

(EN243S).

3. Mount the cover on the front of the cam-

shaft housing.
 Plate 906-6.4
MAN B&W Replacement of Cams on Camshaft Edition 0204
Mounting Page 7 (7)

Exhaust Cam

4. Mount the indicator drive cam and adjust

according to Chapter 706 in the Operation
manual when fitted.

Tighten the self-locking nuts as stated in

D06-48.

5. Before mounting the two-part spare cam,

the bore and the area on the shaft must be
degreased.

Place the two-part spare cam on the shaft,

mount the four screws, and tighten slightly,
so that the gap between the two parts is
equal at both sides.

6. Make sure that the marking scratches on

the cam and the camshaft coincide, and
that the running surface of the cam is op-
posite the roller.

Tighten the screws just hard enough to

avoid that the cam slips when the roller
guide is lowered onto the cam.

Measure the exhaust cam lead (see Proce-

dure 908-5 and adjust if necessary.

Tighten the screws to D06-47 and check

that the gap is still equal at both sides.

Lock the screws with Loctite, type 242

(EN243S).

7. Mount the cover on the front of the cam-

shaft housing.
BLANK
 MAN B&W Chain Drive and Camshaft Panel Plate
Main Bearing - Tools
0063
P90561
90651-0164
 MAN B&W Chain Drive and Camshaft Panel Plate
Main Bearing - Tools
0063
P90561
90651-0164

Item Item
Item Description Item Description
No. No.

906 Tool panel

044 Face impact wrench, fuel cam
070 Chain assembling tool
081 Chain disassembling tool
152 Hydraulic jack
164 Lifting attachment camshaft bearing
 MAN B&W Crankshaft - Pin Gauge Plate
Main Bearing - Tools
0063
P90561
90664-0005
 MAN B&W Crankshaft - Pin Gauge Plate
Main Bearing - Tools
0063
P90561
90664-0005

Item Item Description Item Item Description

No. No.

021 Pin gauge for crankshaft