Komatsu ecot3 PC300LC-8 Shop Manual page 353

30 Testing and adjusting
6. Adjust the valve clearance in the following
procedure.
a When No.1 cylinder is at the compression top
dead center, adjust the valve clearance indi-
cated with q mark in the valve arrangement
drawing.
1) Insert clearance gauge C2 to the clearance
between rocker lever (8) and cross head (9).
2) Loosen locknut (10) and adjust the valve
clearance using adjustment screw (11).
a With the clearance gauge being inserted,
turn the adjustment screw until it allows
clearance gauge C2 to move slightly.
3) Fix adjustment screw (11) and tighten
locknut (10).
3
Locknut:
24 ± 4 Nm {2.45 ± 0.41 kgm}
a After tightening the locknut, check the
valve clearance again.
PC300, 350-8
4) Turn the crankshaft forward by 360
align the counter mark applied in step 5
above accurately to the pointer.
a This alignment moves the supply pump
gear stamp line (b) to the position of
stamp line (c) situated directly below.
5) Adjust the valve clearance indicated with Q
mark in the above valve arrangement
drawing.
a Firing order: 1 - 5 - 3 - 6 - 2 - 4
a The adjustment procedure is the same as
that employed for adjustment of q mark.
7. After finishing adjustment, return the removed
parts.
3
Cylinder head cover mounting bolt:
11.8 ± 1.96 Nm {1.2 ± 0.2 kgm}
SEN02625-06
and
°
13