Komatsu PC88MR-10 Shop Manual page 1063

4. Push rod and crosshead
1) Insert push rods (81) in the tappet guides.
a The push rods for the intake and exhaust
valves are the same.
a If the push rods are free from defects,
install them in the same positions as
before.
2) Install crosshead (82).
a Install the cross rod so that long hole (a)
faces the exhaust side and the short hole
(b) faces the inlet side.
5. Rocker arm assembly
1) Install rocker arm assembly (80).
2) Check that the ball of adjustment screw (77)
is set in the push rod socket securely.
3) Tighten rocker arm assembly (80) with stud
bolt (79) and mounting bolt (78).
PC88MR-10
50 Disassembly and assembly
Mounting bolt (78):
19.6 to 29.4 Nm {2.0 to 3.0 kgm}
a Loosen lock nut (76) and sufficiently
return adjustment screw (77).
4) Adjust the valve clearance.
a Adjust the valve clearance. For details,
see "Testing and adjusting", "Test and
adjust valve clearance".
5) Tighten lock nut (76) with adjustment screw
(77) fixed after adjustment of valve
clearance.
Lock nut (76):
39.2 to 49.0 Nm {4.0 to 5.0 kgm}
a Check the valve clearance again after
tightening the locknut.
6. Rocker housing assembly
1) Install rocker housing (75) with mounting bolt
(74) tightened in the order of [1] to [19] in the
following figure.
Rocker housing tightening order
Engine and cooling system
50-35