FUEL SYSTEM
Specifications
6-4 BY Service Manual
© 2009 Yanmar Marine International
SPECIFICATIONS
Test and Adjustment Specifications
Note: Yanmar supplies a water separating pre-filter for mounting by the installer. The engine is also
equipped with an on-engine fine filter.
Special Torque Chart
Test Item Specification Reference Page
High-Pressure Fuel
Pump Pressure
Minimum at cranking 250 bar (3625 psi)
-Minimum at low idle 400 bar (5800 psi)
Maximum at 4000 rpm 1600 bar (23,200 psi)
Fuel Feed Pump
Pressure (Minimum)
All speeds
5.0 bar (72.5 psi)
Measure Fuel Feed
Pump Pressure on
page 6-9
Return Fuel Pressure
(Maximum)
All speeds
200 mmAq (7.87 in.Aq)
Test Return Fuel
Pressure on page 6-10
Fuel Supply Restriction
(Maximum)
All speeds
0.1 bar (3 in.Aq) -
Fuel Temperature Maximum before speed reduction begins 80°C (176°F) -
Component Tightening Torque
Lubricating Oil
Application (Thread
Portion and Seat
Surface)
Reference Page
Fuel Injector Retaining Nut
9 N·m (80 in.-lb)
Not Applied
Install Fuel Injector on
page 6-13
High-Pressure Fuel Regulator Retaining Nut
80 N·m (59 ft-lb)
Replace High-Pressure
Fuel Regulator on
page 12-25
High-Pressure Fuel Sensor Retaining Nut
70 N·m (52 ft-lb)
Replace High-Pressure
Fuel Rail Pressure
Sensor on page 12-26
High-Pressure Pump
Sprocket Nut Access
Plug
M30 x 1.0
70 N·m (52 ft-lb)
Replace High-Pressure
Fuel Pump on
page 6-15
M40 x 1.5
30 N·m (22 ft-lb)
High-Pressure Pump Drive Sprocket Nut 65 N·m (48 ft-lb)
High-Pressure Fuel Line Union Nut
23 N·m (204 in.-lb)
Remove and Install
High-Pressure Fuel
Lines on page 6-14
Return Fuel Banjo Bolt to Fuel Rail
25 N·m (221 in.-lb)
Remove and Install
Fuel Rail on page 6-20
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