Removal Procedure
- Remove the valve rocker arm cover. Refer to
Valve Rocker Arm Cover Replacement
.
- Remove the valve rocker arm nut. If only the pushrod is to be replaced,
back the valve rocker arm nut off until the valve rocker arm can be swung
away from the pushrod. Then pull the pushrod out.
- Remove the valve rocker arm with the ball.
Important: Store used components in order so they can be reassembled in the same
location.
- Remove the pushrod.
- Inspect the valve rocker arms and balls at their mating surfaces.
These surfaces should be smooth and free from scoring or other damage.
- Inspect the valve rocker arm areas that contact the valve stems
and the sockets that contact the pushrods. These areas should be smooth and
free of damage and wear.
- Inspect the pushrods for bending. Roll the pushrod on a flat surface
to determine if the pushrod is bent. Replace the pushrod if necessary.
- Inspect the ends of the pushrods for scoring or roughness.
Installation Procedure
- Install the pushrod. Make sure the pushrod seats properly in the valve lifter.
Important: When new valve rocker arms and/or balls are installed, coat their bearing
surfaces with high viscosity oil with zinc. Use GM P/N 12345501 or the equivalent.
- Install the valve rocker arm with the ball.
- Install the valve rocker arm nut.
- Adjust the valves. Refer to
Valve Lash Adjustment
.
- Install the valve rocker arm cover. Refer to
Valve Rocker Arm Cover Replacement
.