Rocker Arm Assembly: Adjustments

VALVE ROCKER ARMS AND PUSHRODS

Rocker Arms And Pushrods:

1. Adjust valves when lifter is on base circle of camshaft lobe as follows:
a. Rotate engine until mark on torsional damper lines up with the "0" mark on the engine front cover timing tab, and the engine is in the # 1 cylinder firing position. This may be determined by observing the # 1 cylinder valves as the mark on the damper comes near the "0" mark. If both intake and exhaust valves are closed, the engine is in the # 1 cylinder firing position. If either valve is off its seat as the mark comes up to the timing tab, the engine is in # 6 cylinder firing position and should be rotated 360° to reach the # 1 cylinder position. The # 1 cylinder firing position can also be detected by a gust of air exiting the spark plug hole as the piston approaches "TDC".
b. With the engine in the # 1 firing position, the following valves may be adjusted:

^ Exhaust -- 1, 3, 4, 8.

^ Intake -- 1, 2, 5, 7.

c. Tighten rocker arm nuts until there is no movement of the pushrod. This can be determined by rotating pushrod while turning adjusting nut. Turn adjusting nut an additional 360°.
d. Rotate the crankshaft one revolution until the pointer "0" mark and torsional damper mark are again in alignment. This is the # 6 cylinder firing position. With the engine in this position, the following valves may be adjusted:

^ Exhaust -- 2, 5, 6, 7.

^ Intake -- 3, 4, 6, 8.