Yanmar 6BY2 - Page 6

TABLE OF CONTENTS
vi BY Service Manual
© 2009 Yanmar Marine International
Install Crankshaft..................................................................... 5-62
Replace Front Crankshaft Seal ............................................... 5-64
Intake Manifold.............................................................................. 5-66
Remove................................................................................... 5-66
Install....................................................................................... 5-67
Exhaust Manifold........................................................................... 5-69
Remove................................................................................... 5-69
Install....................................................................................... 5-69
Fuel System......................................................................................... 6-1
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
Cooling System................................................................................... 7-1
Safety Precautions .......................................................................... 7-3
Introduction...................................................................................... 7-4
Specifications .................................................................................. 7-4
Test and Adjustment Specifications .......................................... 7-4
Repair Specifications................................................................. 7-4
Special Torque Chart ................................................................ 7-4
Special Service Tools...................................................................... 7-5
Measuring Instruments.................................................................... 7-5
Cooling Flow Diagram..................................................................... 7-6