Yanmar 4BY - Engine

BY Service Manual
5-1
BY Service Manual
Section 5
ENGINE
Page
Before You Begin Servicing ............................................................ 5-3
Introduction...................................................................................... 5-7
Specifications .................................................................................. 5-7
General Information................................................................... 5-7
Test and Adjustment Specifications .......................................... 5-7
Repair Specifications................................................................. 5-8
Special Torque Chart .................................................................... 5-11
Special Service Tools.................................................................... 5-14
Measuring Instruments.................................................................. 5-15
Tests and Adjustments.................................................................. 5-17
Testing Compression............................................................... 5-17
Repair............................................................................................ 5-18
Cylinder Head................................................................................ 5-19
Cylinder Head Components .................................................... 5-19
General Guidelines.................................................................. 5-20
Remove and Install Cylinder Head Cover ............................... 5-20
Remove and Install Glow Plugs............................................... 5-22
Removal of Cylinder Head....................................................... 5-23
Disassembly of Cylinder Head ................................................ 5-26
Cleaning Cylinder Head Components ..................................... 5-28
Pressure Testing Cylinder Head.............................................. 5-28
Inspection of Cylinder Head Components............................... 5-28
Replacing Valve Stem Seals ................................................... 5-29
Assembly of Cylinder Head ..................................................... 5-30
Determining Cylinder Head Gasket Thickness........................ 5-31
Installation of Cylinder Head.................................................... 5-32