Cylinder Head - Komatsu PC20R-8 Shop Manual

Hydraulic excavator
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REMOVAL AND INSTALLATION
10 - Take out the screws (14) in the sequence indicated
and remove the complete cylinder head (15).
H The cylinder head gasket (16) must be substituted
every time it is dismantled.
INSTALLATION OF THE

CYLINDER HEAD

To install, reverse the removal procedure.
.
1 - Fill up the cooling circuit.
Coolant: approx. 4
2 - Start the engine to circulate the liquid through all cir-
cuits. Stop the engine and check the level.
H Only for cabin version. Make sure that the heat-
ing cock is open.
Screws:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nm
Nuts: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nm
Nut: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nm
Screw: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nm
H Adjust valve clearance. (For details, see «20. CON-
TROLS AND ADJUSTMENTS - Adjusting valve clear-
ance»).
H Raise the cylinder head, keeping it horizontal, and
place it on the gasket without shifting anything.
H Lubricate the screw-threadings with engine oil.
H Tighten the screws in the sequence indicated.
(See figure).
Cylinder head screws: 68.6w1.96 Nm
PC20R-8 PC27R-8
,
15
Exhaust side
8
14
12
2
9
4
10
11
6
13
Intake side
Exhaust side
1
7
13
3
6
11
5
4
2
9
Intake side
CYLINDER HEAD
14
16
RKP06410
5
3
1
7
RKP05131
10
12
14
8
RKP05141
30-15

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