4BY2

Marine Installation Manual - Volume 3

Page
Engine Specifications .....................................................................2
Engine Room Space for Safety, Service and Correct Operation....3
Marine Gear / Stern-Drive Specifications .......................................4
4BY2 (Inboard) ...............................................................................5
4BY2 (Stern-Drive) .........................................................................6
Flywheel Housing Dimensions (For Inboard) .................................7
Flywheel Housing Dimensions (For Stern-Drive) ...........................8
Fuel System Specifications ............................................................9
Piping Diagram .............................................................................10
Cooling System Specifications .....................................................11
Air Intake and Exhaust Specifications ..........................................13
Mixing Elbow ................................................................................14
Alarm System Specifications ........................................................15
Remote Control System ...............................................................15
Electrical System ..........................................................................16
Performance Curves.....................................................................20
Engine Mount ...............................................................................22
Installation Specifications .............................................................23
Cold Starting Aids.........................................................................24
Water Heater Tank Connection ....................................................24
Heat Insulation Requirements ......................................................24
Optional Accessories....................................................................24

Marine Installation Manual - Volume 3 JUN 2009 (Rev. 4) 4BY2 - 1

© 2009 Yanmar Marine International

4BY2 4BY2

4BY2 Parameter Data

Please refer to the Safety section at the beginning 4BY2-150 4BY2-180
of this manual. Low Idling Speed
750 rpm*
(at 88°C [190°F])
Engine Specifications
Firing Order 1 - 3 - 4 - 2 - 1**
Parameter Data Engine Lubrication
Enclosed, Forced
4BY2-150 4BY2-180 System

4-cycle Diesel, 15° Inclined, Engine Oil

Configuration 8,0 L
Dual Overhead Camshaft Capacity (0°
(8.45 qt)***
incline)
Crankshaft
Rotation Dry Weight
Counterclockwise For Stern-Drive: 273. 5 kg
(Viewed from (without Gear/Drive
For Marine Gear: 262.5 kgs
Flywheel) or Mixing Elbow)

Combustion Total Air Flow 1850 m3/h

Direct Injection Requirements (65332 ft3/h)
System
Turbocharger with Charge * 1080 rpm at startup for alternator excitation.
Aspiration
Air Cooler
** No. 1 cylinder is at the coolant pump end of the
Number of
In-line 4 engine.
Cylinders
84 mm x 90 mm *** The engine oil capacity includes oil in the oil pan,
Bore x Stroke channels, coolers, and filter.
(3.307 in. x 3.543 in.)
1.995 L Note: Rating condition, ISO 8665
Displacement
(121.7 cu in.) Fuel temperature: 40°C (104°F)
Continuous Rating
1 hp metric = 0.7355 kW
Output at 88 kW 102 kW
Crankshaft (120 hp) (137 hp)
(at 3600 rpm)
Maximum Output at
110 kW 132 kW
Crankshaft
(150 hp) (180 hp)
(at 4000 rpm)
Piston Speed
11 m/sec 10.8 m/sec
(Continuous Rating
(36.1 ft/sec) (35.4 ft/sec)
Output)
Piston Speed 12.0 m/sec
(Maximum Output) (39.4 ft/sec)
Brake Mean
1.66 MPa 1.95 MPa
Effective Pressure
(240.66 psi) (287.2 psi)
(Maximum Output)
320 N·m 360 N·m
Maximum Torque
(236ft-lb) (265 ft-lb)
High Idling Speed 4600 rpm

4BY2 - 2 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
Engine Room Space for Safety, Service and Correct Operation
Minimum Clearance Minimum Clearance
Minimum Clearance rear side from top above mixing elbow
front cover to E/R wall cover to E/R wall 100 mm (3.9 in.) 928 mm
150 mm (5.9 in.) 200 mm (7.8 in.) (36.5 in.)
537 mm 391 mm
(21.15 in.) (15.4 in.)

70 mm
(2.8 in.)

(21.45 in.)
545 mm

784.8 mm
(30.9 in.)
239.8 mm
298.2 mm

(9.45 in.)
159.8 mm
(11.7 in.)

(6.3 in.)
Minimum Clearance
368.2 mm from engine on both
left and right sides
(14.4 in.) to E/R wall
200 mm (7.8 in.)

Minimum Clearance
below oil pan
50 mm (1.9 in.)
0006581

Figure - 1
The installer is responsible for ensuring that there is sufficient engine room space to access the engine for
service and repair.
Superstructures and connected components should be installed so that the engine can be removed, fitted
and serviced without time being lost to any obstructions.
The following components must be easy to access:
• Fuel filter(s) • Heat exchanger
• Fuel system components for bleeding the fuel • Complete seawater pump assembly (to access
system impeller and filter)
• Air filter • Zinc anodes
• Engine oil filter(s) • Batteries
• Oil fill port and dipstick • Starter motor
• Engine oil drain plug • Alternator
• Marine Gear or Sail-Drive oil fill port / dipstick • Turbocharger
• Coolant tank fill port
• Coolant drain cock(s)
• Coolant pump

Marine Installation Manual - Volume 3 JUN 2009 (Rev. 4) 4BY2 - 3

© 2009 Yanmar Marine International

4BY2 4BY2

Marine Gear / Stern-Drive

Specifications
Use the KMH40 or KMH50 marine gear or ZT350
or Mercruiser Bravo 1, 2 or 3 stern-drive with the
4BY2 series engine.
WARNING! Fire Hazards.
• ZT350 and Bravo stern-drive power steering
hoses must be routed away from hot engine
components.
• Ensure the heat insulator is installed on the
turbocharger.
Note: See the marine gear / stern-drive
manufacturer’s literature for additional
information.

4BY2 - 4 JUN 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
4BY2 (Inboard)

S
893 (35.15)
(2.13)
54
287 (11.29)
278 (10.94)

719 (28.3)

709 (27.91)
240 (9.44) 469 (18.46)

(C16)
VIEW S
Ansicht S
332 (13.07)
286 (11.25)
572 (22.5)

732

204
A

A
286 (11.25)

608 (23.93)
848 (33.38)
366.5 (14.43)

(.24)
61.5

15.5 (.61)

(B16)
SECTION A-A
Schnitt A-A

SAE 20/40-26

0006537

Unit: mm (in.)
Figure - 2
Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 5

© 2009 Yanmar Marine International

4BY2 4BY2

4BY2 (Stern-Drive)

457.5 (18.01)
806 (31.73)
839 (33.03)

54 (2.13)
279 (10.98)
287 (11.3)

671 (26.41)

709 (27.91)
700 (27.56)
469 (18.46)

373 (14.69)
286 (11.26)

802 (31.57)

761 (29.96)
572 (22.52)

204 (8.03)
286 (11.26)
737 (29.02)

149.1 (5.87)

(2.8)
71.1
(3.71)
94.2

0006531

Unit: mm (in.)
Figure - 3

4BY2 - 6 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
12/05
4BY2
Flywheel Housing Dimensions (For Inboard)

119 (4.69)

235 (9.25)

0006491

Figure - 4
Unit: mm (in.)

Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 7

© 2009 Yanmar Marine International

4BY2 4BY2

Flywheel Housing Dimensions (For Stern-Drive)

245 (9.65)

241.3 (95)
(.41)
10.3

0006492

Figure - 5
Unit: mm (in.)

4BY2 - 8 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
Fuel System Specifications
Parameter Data
4BY2-150 4BY2-180
Maximum Fuel Feed 1.0 m
Pump Suction Head (39.37 in.)
Maximum Fuel Feed
160.0 L/hr minimum
Pump Discharge
(42.3 gal/hr minimum)
Volume
Maximum Fuel Feed
5 bar
Pump Discharge
(72.5 psi)
Pressure
Fuel Inlet Pipe
3/8 NPT
Connector Thread
Maximum Fuel Inlet
70°C (158°F)
Temperature
Fuel Consumption at 30.0 L/hr 36.2 L/hr
Rated Output (7.9 gal/hr) (9.6 gal/hr)
Hose acc. DIN ISO 7840
A1 (fire resistance hose) is
requested. Max length of
Fuel Line
hose between prefilter and
(minimum size)
engine depends on suction
height of complete suction
line.
Inner diameter for
8 mm (0.32 in.)
inlet
Inner diameter for
12 mm (0.47 in.)
outlet

Note: Yanmar supplies a water separating pre-

filter for mounting by the installer. The
engine is also equipped with an on-
engine fine filter.
WARNING! Fire Hazard. Always route fuel lines
away from hot engine components, such as the
exhaust manifold, turbocharger and exhaust
hoses. Fuel lines must be secured to the hull
with approved clamps every 100 cm (4.3 in.).

Marine Installation Manual - Volume 3 JUN 2009 (Rev. 4) 4BY2 - 9

© 2009 Yanmar Marine International

4BY2 4BY2

Piping Diagram
Fuel Flow

(9)

(10)
(8)

(15)

(7)

(11)

(14) (2)

(6) (4) (3)

(12)

(16)

(1)
(5) (13)

0006494

1. Fuel Inlet from Tank 10. Fuel Injector Return Hose

2. Fuel Filter (10 micron) 11. Common Rail Return Line
3. Fuel Feed Pump 12. Return Fuel Tee with Back Pressure Valve
4. Inlet Fuel Temperature Sensor 13. Return Fuel to Fuel Tank with Over Pressure
5. High-Pressure Fuel Pump Valve
6. High-Pressure Fuel Supply Line 14. Fuel Pressure Sensor
7. High-Pressure Fuel Common Rail 15. Fuel Pressure Regulator (ECU-Controlled)
8. Fuel Injection Line 16. Fuel Measuring Unit (ECU-Controlled)
9. Fuel Injector

Figure - 6

4BY2 - 10 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
Cooling System Specifications
Parameter Data
4BY2-150 4BY2-180
Closed Cooling with
Cooling System
Heat Exchanger
Coolant Capacity
10.0 L (10.6 qt)
(Approximately)
Coolant Capacity 1.0 L
(Recovery Tank) (1.0 qt)
Maximum Seawater
165 L/min
Pump Flow Rate at
(174 qt/min)
Maximum Rating
Maximum Seawater 0.5 m
Pump Suction Head (19.69 in.)
Seawater Inlet Pipe 38.1 mm
Connector Outer (1.5 in.)
Diameter
Thermostat Operating 96°C
Temperature (205°F)
(Full Open)
Thermostat Operating 88°C
Temperature (Opening) (190.4°F)
Maximum Overflow 1.0 m
Pipe Length (39.37 in.)
(Coolant Recovery Tank
to Filler Cap)
Overflow Pipe Inner 6 mm
Diameter (0.250 in.)
(Coolant Recovery Tank
to Filler Cap)
Water Heater Tank / 10 mm
Cabin Heater Pipe (0.394 in.)*
Inside Diameter

* Must have a minimum pressure rating of 1.5 bar

(22 psi).

NOTICE: The coolant hose from the heat

exchanger to the sub-tank must be routed away
from hot engine components. NEVER route
coolant hoses over the flywheel side of the
engine.

Marine Installation Manual - Volume 3 JUN 2009 (Rev. 4) 4BY2 - 11

© 2009 Yanmar Marine International

4BY2 4BY2

Cooling Flow

(2) (3)

(1)
(6)
(4)
(7)

(5)

(12)
(9)

(13)

(8)

(11)

(10)

0006511

1. Seawater Supply 8. Engine Coolant Pump

2. Seawater Pump 9. Thermostat
3. Hydraulic Oil Cooler 10. Engine Oil Cooler
4. Charge Oil Cooler 11. Engine Coolant Passages
5. Engine Heat Exchanger 12. Coolant Recovery Tank
6. Exhaust / Seawater Mixing Elbow 13. Water Cooled Exhaust Manifold
7. Exhaust / Seawater Exit

Figure - 7

4BY2 - 12 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
12/05
4BY2
Air Intake and Exhaust Specifications
Check for leaks at initial start.

Parameter Data
4BY2-150 4BY2-180
Exhaust Pipe
Outer 102 mm
Diameter (4.0 in.)
Connection
Air Volume
Necessary for 650 m3/h
Combustion (22955 ft3/h)
at WOT
Maximum Air 4.0 kPa
Inlet 408 mmAq
Depression (16.06 in.Aq)
Maximum 45 kPa
Back 4589 mmAq
Pressure (180.67 in.Aq)
Maximum 620°C (1148°F) 700°C (1292°F)
Output at rated speed at rated speed
Exhaust
Temperature 660°C (1200°F) 660°C (1200°F)
Before at full load at full load
Turbocharger 2000 rpm 2000 rpm
Location: Mixing Elbow
EPA Exhaust
G 1/4 - 19 BSPP*
Test Port
or
Sizes
G 3/8 - 19 BSPP*
Maximum
Turbocharger 1600 / 1750 1650 / 1800
Boost mbar mbar
Pressure (23.2 / 25.4 psi) (23.9 / 26.1 psi)
(min/max)
Maximum
Engine Room 60°C
Ambient (140°F)
Temperature

* NOTE: Back pressure measured from EPA test

port located on the mixing elbow. NOTICE: Test
ports are British Standard Pipe Parallel (BSPP)
not National Pipe Thread (NPT). BSPP and NPT
threads are not compatible due to the thread pitch.
Mixing can cause thread damage.

Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 13

© 2009 Yanmar Marine International

4BY2 4BY2

Mixing Elbow

406 (15.98)

(4 120
351 (13.82)

2)
404.5 (15.93)

.7
336

ø1 .02
(ø

02 )
(13.23)

4
436.1 (17.17)
528.9 (20.82)

664.5 (26.16)

472.2 (18.59)
386.4 (15.21) 223.2
(8.78)
(ø 4 .0 2

328 (12.91)
ø102

560.7 (2.21)

486.9(19.17)
(ø 4 .0
)

ø102 )
604.3 (23.79)

2
574.2 (22.61)

506.9 (19.96)

561.3 (22.1)

0006599

Unit = mm (in.)
To install mixing elbow:
1. Torque V-clamp to 4.0 N·m (35.4 lb-in.).
2. Lightly tap on mixing elbow with plastic hammer
to center elbow.
3. Tighten V-clamp to final torque of 5.5 ± 0.5 N·m
(48.6 ± 4.4 lb-in.).

4BY2 - 14 JUN 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
12/05
4BY2
Alarm System Specifications Remote Control System
Parameter Data Panel
4BY2-150 4BY2-180 The 4BY2 series utilizes Yanmar Marine Electronic
Coolant Overheat control technology, incorporating an LCD
Alarm Operating 108°C (226°F) multi-function display panel. Refer to the
Temperature appropriate Yanmar Electronic Control System
Installation Manual for detailed component
Below 1500 rpm: specifications and options.
Lube Oil Low Pressure < 0.5 bar (7.25 psi) for
Alarm (Alarm not more than one second) Yanmar Digital Display
available on Classic Above 1500 rpm:
(1)
controls) < 2.0 bar (29 psi) for (2)
more than one second
Overspeed Protection
4600 rpm
(fuel cutoff)

2 3 0 100
84 PSi
1 4 (3)
0 2615
X1000 RPM
100 250
11 4 Fah

0003327
1. Tachometer
2. Engine Oil Pressure Meter
3. Multi-function Meter
Figure - 8

Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 15

© 2009 Yanmar Marine International

4BY2 4BY2

Electrical System Starter Specifications

Check all electrical connections per the wiring Parameter Data
diagrams and ensure the bolts are tightened to the 4BY2-150 4BY2-180
correct torque specifications.
Yanmar Code 165000-70090
Battery Specifications Starter Model BOSCH
Parameter Data Voltage 12 V
4BY2-150 4BY2-180 Output 2.0 kW (2.7 hp)
Battery Size 12 V, 85Ah, Direction of Rotation
(Minimum)* 680 CCA (cold cranking amps) (Viewed from Pinion Clockwise
Side)
Battery Voltage 12 V
Weight 3.5 kg (7.7 lb)
Nominal Output 12 V / 150 A
Number of Pinion
Earth Polarity Negative Ground 9
Teeth
* Note: No other device can be connected to the No-load Terminal
starting battery. 12 V
Voltage
Loaded Terminal
Battery Cable Requirements 5.3 V
Voltage
Battery Cable Battery Cable Loaded Maximum
AWG 1282 A
Length Area Current
1.0-2.5 m 50 mm2 Loaded Torque 32.3 N·m
1
(3.3-8.2 ft) (0.08 in.2) (23.8 lbf-ft)
2.0-4.0 m 70 mm2
2/0
(6.6-13.1 ft) (0.11 in.2)
2.5-5.0 m 95 mm2
3/0
(8.2-16.4 ft) (0.15 in.2)
3.25-6.5 m 120 mm2
4/0
(10.7-21.3 ft) (0.19 in.2)

WARNING! Fire Hazard. Always route battery

cables away from hot engine components, such
as the exhaust manifold, turbocharger and
exhaust hoses. Install rubber protective caps
on each battery terminal.

4BY2 - 16 JUN 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
Starter Performance Curve
SPEED OUTPUT TORQUE VOLTS
(rpm) (kW) (N•m) (V)

kW

N•m

rpm

CURRENT (A) 0004044

Figure - 9

Standard Alternator Data

Parameter Data
4BY2-150 4BY2-180
Yanmar Code 165000-70090
Alternator Model Valeo
Alternator 12 V, 150 A
IC Regulator
7 788 823.1
Model
Rotation
(Viewed from Clockwise
Pulley End)
Weight 6.9 kg (15.2 lb)

Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 17

© 2009 Yanmar Marine International

4BY2 4BY2

Wiring Diagram

B+
(3) (4) (5) (8) (9) (10)
(7)
F2 F1 F6 (6) F4 F3 F5
X1/C

KL50 KL15 KL87

(49)
201 203 205

X1/B
224
182
207
234
(12) (11)
157
K1
ϑ 132

(48)
X1/R
(44) ϑ (1)
p
X1/G (43) 154
232 (13)
(47) (42) K2
X1/D
(46) 107
(15)
106 220 (14)
180
(45) K3
139

(16) 187

(2) (16)
(41) 115

162 (54)
124 X1/H
(40) 114

X1/L
243
245 X1/F
(18)
X1/W X1/V (37) X1/N 252
256
BOSCH
X1/O

(36) EDC16 172

(19)
p X1/K 239
DDE 5 DRV
X1/P 229

X1/M
171
(20)
(39) (38) 230
ZME
183
(35) 130
ϑ (34)
149
(21)
p
156
(50) 173

151 (22)
111
175
178
103
(23)
F7 211
127
KL87
(33)
150
(24)
F8 251
(51) 174

(32) 102 (25)

238
126
X1/J
250
101
(26)
(30) 125
X1/E 208
(31) 202 204 206 233 246

KL31
X1/Q
X1/A X1/U (53)
(52) (27)
(28) X1/S X1/T

0003303

(29)

Figure - 10

4BY2 - 18 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
1. Engine Control Unit (ECU) 28. CAN Signal - High
2. Internal ECU Sensors (operating voltage and 29. Panel, ECU, and CAN Ground
ambient air pressure) 30. K-Line
3. Fuse (F2) 10 A1 - Ignition 31. Neutral Start Switch (NC in neutral)
4. Fuse (F1) 3 A - CAN Switched Power 32. Jumper Fuse (F8) 3 A - CAN / Analog Throttle
5. Fuse (F6) 10 A - Auxiliary Power Selection, default is analog (fuse out). Insert
6. Start Signal from Key Switch 3 A fuse to configure for CAN.
7. Fuse (F4) 30 A - ECU Switched Power 33. Jumper Fuse (F7) 3 A - Single / Port Selection,
8. Fuse (F3) 15 A - Fuel Supply Pump default is single / port (fuse in). Remove fuse for
9. Fuse (F5) 20 A - Fuel Pressure Regulator, starboard configuration.
Water-in-Fuel, Camshaft Sensor, and Fuel 34. Fuel Rail Pressure Sensor
Volume Regulator 35. Fuel Temperature Sensor
10. Circuit Breaker (Boatbuilder Installed) 36. Subthrottle Sensor 2
11. Power to Starter Solenoid Primary Terminal 37. Subthrottle Sensor 1
12. Starter Relay K1 38. Oil Pressure Sensor
13. Main Power Relay K2 39. Water-in-Fuel Sensor
14. Fuel Supply Pump Relay K3 40. Camshaft Speed Sensor
15. Power to Fuel Supply Pump 41. Crankshaft Speed Sensor
16. B+ to Water-in-Fuel Sensor 42. Charge Air Pressure Sensor
17. Not Used 43. Charge Air Temperature Sensor
18. Check Engine Indicator Output 44. Engine Coolant Temperature Sensor
19. Fuel Rail Pressure Control Valve 45. Ignition Power Input from Key Switch (terminal
20. Fuel Volume Control (high-pressure pump) X1-D)
21. Fuel Injector No. 4 (4BY2) or No. 6 (6BY2) 46. Auxiliary Power Output (terminal X1-G)
22. Fuel Injector No. 2 (4BY2) or No. 2 (6BY2) 47. NMEA + Power Supply (X7-R)
23. Fuel Injector No. 3 (4BY2) or No. 5 (6BY2) 48. Battery Power to Key Switch (terminal X1-B)
24. Fuel Injector No. 1 (4BY2) or No. 3 (6BY2) 49. CAN Signal Blocking Diode
25. Fuel Injector No. 1 (6BY2) 50. High Bench 1
26. Fuel Injector No. 4 (6BY2) 51. High Bench 2
27. CAN Signal - Low 52. Oil Pressure Switch (X1-Q)
53. NMEA Ground Supply
54. Power Resistor for the Generator

1
NEVER connect any additional devices to F2. F6
may be used however, it is not switched.

Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 19

© 2009 Yanmar Marine International

4BY2 4BY2

Performance Curves
Power and Torque
4BY2-150
600 200

525 175

450 150

375 125
torque [Nm]

power [kW]
300 100

torque power
225 75

150 50

75 25

0 0
0 1000 2000 3000 4000
engine speed [rpm]
0006525

Figure - 11

4BY2-180
600 200

525 175

450 150

375 125
torque [Nm]

power [kW]

300 100

torque
power
225 75

150 50

75 25

0 0
0 1000 2000 3000 4000
engine speed [rpm]

0006526

Figure - 12
4BY2 - 20 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
12/05
4BY2
Fuel Consumption
4BY2-150

specific fuel consumption

270

265

260

255
specific fuel consumption [g/kWh]

250

245

240

235

230

225

220

215

210

205

200
500 1000 1500 2000 2500 3000 3500 4000 4500
engine speed [rpm]

0006577

Figure - 13
4BY2-180
specific fuel consumption
270

265

260

255
specific fuel consumption [g/kWh]

250

245

240

235

230

225

220

215

210

205

200
500 1000 1500 2000 2500 3000 3500 4000 4500
engine speed [rpm]

0006578

Figure - 14

Marine Installation Manual - Volume 3 APR 2009 (Rev. 4) 4BY2 - 21

© 2009 Yanmar Marine International

4BY2 4BY2

Engine Mount

(
T IG H T E N T O 1 1 0 N m
( 8 1 L b - F t) O N
A S S E M B LY

TI G H TEN TO 50 N m
(37Lb-F t ) O N
157
ASSEMBLY
(6.18)

49
(1. 93) 4
(. 16)

140 (5.51)

183 (7.20)

20 (. 79)

75 13 30
(2. 95) (. 51) (1.18)

13
(.51)

Unit: mm (in.)

4BY2 - 22 APR 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International

4BY2
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4BY2
Marine Gear Side Mounts for Installation Specifications
KMH40A / 50A (41A / 51A)
Inclination Angle Specifications
Type of Mount: Flexible
Part Number 120650-08410
Trelleborg
Mount ID Movex Number 10-03964-01
Compound 16 x 45 Ǫ
Water line
Quantity 2 Ǫ+7°

Standard Front Engine Mounts ǩ0 ǩ

Type of Mount: Flexible

Part Number 120650-08401 Ǫ
ǫ
Trelleborg
Mount ID Movex Number 10-04418-01
Compound 16 x 55
Quantity 2 Crankshaft center 023993-00E

Figure - 15

Inclination Angle
Static Running Peak
Unit = degree
β 0-8 max 20 25
λ 0 -5 -10
α 0 20 25

Marine Installation Manual - Volume 3 JUN 2009 (Rev. 4) 4BY2 - 23

© 2009 Yanmar Marine International

4BY2 4BY2

Cold Starting Aids Heat Insulation Requirements

The 4BY2 series engine is equipped with a glow
plug cold starting aid. Temperature proof from -30 to +150°C.
Must fulfill the requirements of ISO 4589 for noise
Water Heater Tank Connection and temperature.
The 4BY2 series engine supports water heating
WARNING! Fire Hazard. The insulation material
tank connections for onboard head and galley
used over the turbocharger must be made of
operation.
fire-resistanant material.
NOTICE: Always route coolant hoses away
from hot engine components. NEVER route Optional Accessories
coolant hoses over the flywheel side of the The following is a list of the 4BY2 series optional
engine. To prevent damage from excess accessories.
vibration, secure coolant hoses with approved
clamps. • Yanmar digital display
• Yanmar rocker switch panel (1st station)
• Yanmar interface module, HARNESS
• Yanmar control head
2 • Yanmar NMEA, terminal and T-connector,
CABLE)
WARNING! Fire Hazard. Always route electrical
connectors and harnesses away from hot
1 engine components. To prevent damage from
excess vibration, secure electrical connectors
and harnesses with approved clamps.
0004144

1. Water from Tank

2. Water to Tank
Figure - 16

4BY2 - 24 JUN 2009 (Rev. 4) Marine Installation Manual - Volume 3

© 2009 Yanmar Marine International