5-3
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
22
23
20
21
30
31
2
3
4
5
6
7
9
12
13
14
19
29
8
10
11
17
18
1
15
16
20
24
25
26
27
28
Wear at both ends,
bend
Cam contact face
and outer peripheral
contact face wear
Settling, crack
Wear
Wear
Wear, oil hole clogging
Stem and seat face wear,
corrosion, flaw,
carbon deposit
Crack, oil leak,
settling
Replace
Replace
Replace
Replace
Crack, carbon deposit,
flaw, scale deposit
Replace
Replace
Replace
Crack, flaw, settling,
rubber crack
Contact, wear
Crack, oil leak,
scale deposit
Flaw
Exhaust
Double spring spec
Disassembling Sequence
1 Rocker cover
2 Fuel inlet connector
3 Washer, nut
4 Nozzle gland
5 Fuel injection nozzle
6 Gasket
7 Adjusting screw
8 Bolt
9 Rocker arm
10 Spacer
11 Rocker shaft
12 Bridge cap
13 Valve bridge
14 Push rod
15 Water outlet connector
16 Rocker case
17 Cylinder head bolt
18 Cylinder head (Approx 35 kg [77.2 lb])
19 Inlet port packing
20 Valve cotter
21 Valve rotator
22 Valve spring
23 Stem seal
24 Valve rotator
(24 to 28 exhaust double spring spec)
25 Inner valve spring
26 Outer valve spring
27 Lower retainer
28 Stem seal
29 Valve
30 Cylinder head gasket
31 Tappet
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