Valve Clearance: Adjustments

1. Remove rocker arm cover.
2. Crank engine until the mark on the vibration damper aligns with the "0 mark on the timing tab and the engine is in the number one firing position. This may be determined by placing fingers on valves of number one cylinder as the mark on the damper comes near the " 0 mark on the timing tab. If the rocker arms are not moving, the engine is in the number one firing position. If the rocker arms move as the marks comes up to the timing tab, the engine is in the number six firing position and should be turned over one more time to reach the number one firing position.
3. With the engine in this position, exhaust valves 1, 3, 4 and 8 and intake valves 1, 2, 5 and 7 can be adjusted. Even numbered cylinders are in the right bank, odd numbered cylinders are in the left bank when viewed from the rear of the engine.
4. Back off the adjusting nut until lash is felt at the pushrod, then turn in the adjusting nut until all lash is removed. This can be determined by rotating the pushrod while turning the adjusting nut. When play has been removed, turn the adjusting nut in one full additional turn.
5. Crank engine one complete revolution until the timing tab " 0 mark and vibration damper mark are aligned. This is the number six firing position.
6. With the engine in this position, exhaust valves 2, 5, 6 and 7 and intake valves 3, 4, 6 and 8 can be adjusted.
7. With valves properly adjusted, install rocker arm cover.