Komatsu Utility 4D98E Series User Manual

4. Disassembly, Inspection and Reassembly of Engines.............................. 59
4.1 Complete disassembly and reassembly ................................................................................ 59
4.1.1 Introduction ............................................................................................................................59
4.1.2 Special service tools
...............................................................................................................60
4.1.3 Complete disassembly ...........................................................................................................
65
4.1.4 Precautions before and during reassembly
............................................................................69
4.1.5 Adjusting operation.................................................................................................................
69
4.2 Cylinder Head: Disassembly, Inspection and Reassembly.................................................... 70
4.2.1 Components (2-valve cylinder head)......................................................................................70
4.2.2 Disassembly procedure:
.........................................................................................................70
4.2.3 Reassembly procedure: .........................................................................................................
71
4.2.4 Servicing points ......................................................................................................................
72
4.2.5 Parts Inspection and measurement........................................................................................
76
4.2.6 Valve seat correction
..............................................................................................................80
4.2.7 Valve guide replacement
........................................................................................................81
4.2.8 Valve stem seal replacement
..................................................................................................82
4.3 Gear Train and Camshaft ...................................................................................................... 83
4.3.1 Components...........................................................................................................................83
4.3.2 Disassembly proce
dure:.........................................................................................................83
4.3.3 Reassembly procedure: .........................................................................................................
83
4.3.4 Servicing points ......................................................................................................................
84
4.3.5 Parts in
spection and measurement ........................................................................................87
4.3.6 Oil seal replacement (Gear case side) ...................................................................................89
4.3.7 Camshaf
t bushing replacement..............................................................................................89
4.4 Cylinder Block........................................................................................................................ 90
4.4.1 Components...........................................................................................................................90
4.4.2 Disassembly proce
dure:.........................................................................................................90
4.4.3 Reassembly procedure: .........................................................................................................
90
4.4.4 Servicing points ......................................................................................................................
91
4.4.5 Parts in
spection and measurement ........................................................................................95
4.4.6 Cylinder bore correction .......................................................................................................
106
4.4.7 Piston pin bushing replacement ...........................................................................................107
4.4.8 Oil seal
replacement (Flywheel housing side) ......................................................................107

Komatsu Utility 4D98E Series Specifications

General

Brand	Komatsu Utility
Model	4D98E Series
Category	Engine
Language	English