Komatsu Galeo PC138US-8 Shop Manual page 806

SEN02710-00
2) Install the exhaust manifold and tighten
the mounting bolt.
3
Exhaust manifold mounting bolt:
9.8 – 12.7 Nm {1.0 – 1.3 kgm}
[*14]
a One (1) of the water pump mounting bolts is
tightened together with the alternator mounting
bracket.
[*15] [*16]
a Before installing rocker arm assembly (77),
loosen lock nut (74) and fully loosen adjust-
ment screw (75).
a When installing rocker arm assembly (77),
tighten the mounting bolts alternately by
checking that the adjustment screw ball fits to
the push rod socket.
3
Rocker arm mounting bolt (76):
19.6– 29.4 Nm {2.0– 3.0 kgm}
For adjustment of the valve clearance, refer to
q
"Adjusting valve clearance" in Testing and
adjusting.
[*17]
Tightening procedure for the cylinder head
q
mounting bolt
Apply molybdenum disulphide lubricant (LM-P)
to the threads of cylinder head mounting bolt,
and tighten the bolts in the order shown in the
diagram.
3
Cylinder head mounting bolt:
1st time: 68.6 ± 9.8 Nm {7.0 ± 1.0 kgm}
2nd time: 107.8 ± 4.9 Nm {11.0 ± 0.5 kgm}
3rd time: Mark the bolt head and cylin-
der head, and turn the cylinder
head by 90
a After tightening, stamp a punch mark (n),
indicating the number of tightening, on the
bolt head.
a If a bolt has 5 punch marks, do not reuse.
Replace it with a new one.
18
° °
(+30/0 ) to tighten.
50 Disassembly and assembly
(In the diagram, (F) indicates the front of engine,
(R) the rear and (b) a plastic region turning angle
tightening bolt.)
(In the diagram, (p1) indicates a cylinder head
marking and (p2) the bolt head.)
PC138US, USLC-8