How to Adjust Valve Clearance for Komatsu PC25-1, PC30-7

by Dave Jack Auto Car Repair Knowledge
Komatsu PC25-1, PC30-7  Komatsu CSS Full Set
1. Remove the cylinder head cover.

2. Rotate the crankshaft in the normal direction, set No.1 cylinder at compression top dead center, andalign pointer(1) on the gear case with mark (2) on the crankshaft pulley. When rotating, check the movement of the valve.
Komatsu LinkOne Parts Catalogue
★When the crankshaft is rotated, the valves of the cylinder at compression top dead center do not move.
If the valves move, rotate the crankshaft one more turn and align pointer (1) with mark (2).

3. To adjust the valve clearance, loosen locknut (6). then insert feeler gauge E between rocker lever (3)
and valve stem (4), and turn adjustment screw (5)
until the clearance is a sliding fit. Then tighten locknut (6) to hold the adjustment screw in posi-tion.
o] Locknut:4.5±0.5kgm

4. After adjusting No.1 cylinder at top dead center, turn the crankshaft 240° each time and adjust the valve clearance of the remaining cylinders according to the firing order.
* Firing order:3-1-2
★As another method of adjustment, set No.1 cylinderat top dead center, and adjust the valves marked ..
Next, rotate the crankshaft one turn (360°) in thenormal direction and adjust the clearance of the remaining valves marked o.

Use a pressure gauge in the same way as when measuring the tire inflation pressure on a car,and check carefully that there is no leakage of gas when measuring.There is a push button installed to the pres-sure gauge.Press it after measuring the pressure to return the pressure to 0 kg/cm2.
When measuring or adjusting the pressure,always return the gauge pressure to 0 kg/cm2 before starting.

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About Dave Jack Advanced   Auto Car Repair Knowledge

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Joined APSense since, April 13th, 2017, From Tukwila, United States.

Created on May 13th 2020 21:22. Viewed 499 times.


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