Specifications; Test And Adjustment Specifications; Special Torque Chart - Yanmar BY Series Service Manual

FUEL SYSTEM

SPECIFICATIONS

Test and Adjustment Specifications

Test Item
High-Pressure Fuel
Pump Pressure
Fuel Feed Pump
Pressure (Minimum)
Return Fuel Pressure
(Maximum)
Fuel Supply Restriction
(Maximum)
Fuel Temperature
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

Component
Fuel Injector Retaining Nut
High-Pressure Fuel Regulator Retaining Nut
High-Pressure Fuel Sensor Retaining Nut
High-Pressure Pump
Sprocket Nut Access
Plug
High-Pressure Pump Drive Sprocket Nut
High-Pressure Fuel Line Union Nut
Return Fuel Banjo Bolt to Fuel Rail
6-4
Minimum at cranking
Minimum at low idle
Maximum at 4000 rpm
All speeds
All speeds
All speeds
Maximum before speed reduction begins
Tightening Torque
9 N·m (80 in.-lb)
80 N·m (59 ft-lb)
70 N·m (52 ft-lb)
M30 x 1.0
70 N·m (52 ft-lb)
M40 x 1.5
30 N·m (22 ft-lb)
65 N·m (48 ft-lb)
23 N·m (204 in.-lb)
25 N·m (221 in.-lb)
© 2009 Yanmar Marine International
Specification
250 bar (3625 psi)
400 bar (5800 psi)
1600 bar (23,200 psi)
5.0 bar (72.5 psi)
200 mmAq (7.87 in.Aq)
0.1 bar (3 in.Aq)
80°C (176°F)
Lubricating Oil
Application (Thread
Portion and Seat
Surface)
Not Applied

Specifications

Reference Page
-
Measure Fuel Feed
Pump Pressure on
page 6-9
Test Return Fuel
Pressure on page 6-10
-
-
Reference Page
Install Fuel Injector on
page 6-13
Replace High-Pressure
Fuel Regulator on
page 12-25
Replace High-Pressure
Fuel Rail Pressure
Sensor on page 12-26
Replace High-Pressure
Fuel Pump on
page 6-15
Remove and Install
High-Pressure Fuel
Lines on page 6-14
Remove and Install
Fuel Rail on page 6-20
BY Service Manual