Rocker Arm Assembly: Service and Repair

Valve Rocker Arm and Push Rod Replacement

Removal Procedure

Important: Mark, organize and sort the cylinder head components. Return the components to their original location during reassembly.





1. Remove the valve rocker arm cover.
2. Remove the valve rocker arm nuts, valve rocker arm balls, and valve rocker arms.





Important: The exhaust pushrods (2) are longer than the intake valve pushrods (1).

3. Remove the pushrods
4. Store the removed components in order so that the components can be reassembled in the same location.





5. Remove the valve rocker arm studs and pushrod guide plates, if necessary.
6. Clean and inspect the valve rocker arms and pushrods.

Installation Procedure

Important: Be sure to keep parts in order. Parts must be pus back from where they were removed.





1. Apply sealant GM U.S. P/N 12346004, Canada P/N 10953480, or equivalent to the valve rocker arm stud-to-cylinder head threads.

Notice: Refer to Fastener Notice in Service Precautions.

2. Install the pushrod guides and valve rocker arm studs.
^ Tighten the valve rocker arm studs to 50 Nm (37 ft. lbs.).





Important: The exhaust valve pushrods (2) are longer than the intake valve pushrods (1).

3. Install the valve pushrods.





4. Coat the valve rocker arm and valve rocker arm ball bearing surfaces with lubricant GM U.S. P/N 12345501, Canada P/N 992704, or equivalent.
5. Install the valve rocker arms, valve rocker arm balls, and valve rocker arm studs.
^ Tighten the valve rocker arm nuts slowly to 25 Nm (18 ft. lbs.) while guiding the tips of the rocker arms over the tips of the valves.
6. Install the valve rocker arm cover.