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Chapter 5 DISASSEMBLY OF BASIC ENGINE
Chapter 5 DISASSEMBLY OF BASIC ENGINE
1. Cylinder Heads and Valve Mechanisms - Disassemble and Inspect
Understanding of the current engine condition before disassembling is very important to know the cause of trouble and do the
efficient work.
Depending on the maintenance work or purpose, it is desirable to inspect some of the following items before proceeding with
any job.
Valve Clearance - Inspect
Fuel Injection Timing - Inspect
Clearance Between Bottom Face of Valve Bridge and Top Face of Valve Rotator - Inspect
Valve Sinkage - Measure
Cylinder Heads and Valve Mechanisms - Disassemble and Inspect
25
16
10
9
12
11
1
13
15
17
20
21
22
23
14
8
19
18
2
3
4
5
6
7
24
Replace
Replace
Replace
Replace
Replace
Replace
Replace
Wear
Wear
Corrosion
Wear at both
ends, bend
Wear, oil hole
clogging
Stem/face portion wear, corrosion,
flaw, carbon deposit
Cam contact face and outer
peripheral contact face wear
Crack, flaw, settling,
rubber portion crack
Crack, carbon deposit,
flaw, scale deposit
Contact, wear
Flaw
Wear, oil hole clogging
Settling, crack
Crack, oil leak,
settling
Disassembling Sequence
1 Rocker cover
2 Fuel injection pipe
3 Fuel leak-off pipe
4 Washer, nut
5 Nozzle gland
6 Fuel injection nozzle
7 Gasket
8 Adjusting screw
9 Rocker bracket bolt
10 Cylinder head bolt (long)
11 Rocker arm
12 Rocker shaft
13 Rocker shaft bracket
14 Bridge cap
15 Valve bridge
16 Push rod
17 Cylinder head bolt (short)
18 Cylinder head (Approx. 29 kg [64 lb])
19 Valve cotter
20 Valve rotator
21 Valve spring
22 Stem seal
23 Valve
24 Cylinder head gasket
25 Tappet
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