BUSHING 3256029 - Caterpillar

Adjust the valve lash using the specifications from Table 2.
Lightly tap the rocker arm with a soft mallet.Note: This ensures that the roller lifter seats against the base circle of the camshaft.
Loosen the adjustment locknut for the appropriate valves.
Place the feeler gauge between the rocker arm and the valve bridge.
Turn the adjustment screw in a clockwise direction while sliding the feeler gauge back and forth between the rocker arm and valve bridge. Continue turning the adjustment screw in a clockwise direction until a slight drag is felt on the feeler gauge.
Tighten the adjustment locknut to 30 7 N m (22 5 lb ft).Note: Do not allow the adjustment screw to turn while torquing the locknut.
Recheck the valve