Komatsu Galeo PC138US-8 Shop Manual page 338

SEN02458-01
Adjust the valve clearances marked with q in
5.
the valve arrangement drawing according to
the following procedure.
1) While fixing adjustment screw (1), loosen
locknut (2).
2) Insert thickness gauge B2 in the clearance
between rocker arm (3) and valve stem (4)
and adjust the valve clearance with
adjustment screw (1).
a With the thickness gauge inserted,
turn the adjustment screw to a degree
that you can move the thickness
gauge lightly.
3) While fixing adjustment screw (1), tighten
locknut (2).
3
Locknut:
24 ± 4 Nm {2.45 ± 0.41 kgm}
a After tightening the locknut, check the
valve clearance again.
6. Rotate the crankshaft forward 1 turn according
to step 4 to set the No. 4 cylinder to the com-
pression top dead center and adjust the valve
c l ea r a nc e s m a r k ed wi th Q i n t he va l v e
arrangement drawing similarly to those marked
with q .
10
7. After finishing adjustment, remove the adjust-
ing tools and return the removed parts.
k
Take care not to forget remove gear B1.
3
Cylinder head cover mounting nut:
8.82 ± 0.98 Nm {0.9 ± 0.1 kgm}
30 Testing and adjusting
PC138US, USLC-8