Komatsu PC500LC-10R, Shop Manual, Page: 435 / 758

4.
Remove the plate (5) of the engine flywheel housing, and
insert the gear A.
5.
Rotate the crankshaft in the normal direction with gear A,
align the stamped mark (11) on the crank pulley (10) to the
fan shaft center from the undercover (2) side in order to
set No. 1 cylinder to the compression top dead center.
REMARK
• Check that both of the intake rocker arm and exhaust
rocker arm at the compression top dead center are
movable the same amount of valve clearance by hand.
• If the rocker arm cannot be moved, No. 1 cylinder is
not at its compression top dead center. In that case, ro-
tate the crankshaft one more turn.
• Only 1 stamped line is made on the circumference.
6.
While No. 1 cylinder is at the compression top dead center,
check the valve clearance marked with ● in the figure.
7.
Rotate the crankshaft clockwise by 1 turn and check the
valve clearance of the remaining valves marked with ○.
REMARK
You may check the valve clearance of No. 1 cylinder while
No. 1 cylinder is at the compression top dead center. You
may check the valve clearance of each cylinder in the fir-
ing order by turning the crankshaft in the normal direction
by 120 ° at a time.
Firing order: 1-5-3-6-2-4
30 TESTING AND ADJUSTING TEST AND ADJUST VALVE CLEARANCE
PC500LC-10R 30-29