Yanmar BY Series Service Manual page 133

BY Service Manual
FUEL SYSTEM
Safety Precautions .......................................................................... 6-3
Introduction...................................................................................... 6-3
Specifications .................................................................................. 6-4
Test and Adjustment Specifications .......................................... 6-4
Special Torque Chart................................................................. 6-4
Special Service Tools...................................................................... 6-5
Fuel System Components ............................................................... 6-6
4BY2 Engines............................................................................ 6-6
6BY2 Engines............................................................................ 6-6
Fuel Flow Diagram .......................................................................... 6-7
Tests and Adjustments.................................................................... 6-9
Measure Fuel Feed Pump Pressure.......................................... 6-9
Test Return Fuel Pressure ...................................................... 6-10
Repair............................................................................................ 6-11
Remove Fuel Injector .............................................................. 6-11
Clean Fuel Injector Cavities..................................................... 6-12
Install Fuel Injector .................................................................. 6-13
Remove and Install High-Pressure Fuel Lines ........................ 6-14
Replace the Fuel Feed Pump.................................................. 6-15
Replace High-Pressure Fuel Pump ......................................... 6-15
Replace Fuel Filters................................................................. 6-19
Remove and Install Fuel Rail................................................... 6-20
Replace Injector Return Fuel Line ........................................... 6-21
Bleed the Fuel System ............................................................ 6-22
BY Service Manual
Section 6
© 2009 Yanmar Marine International
Page
6-1