Rocker Arm Assembly: Service and Repair

Valve Rocker Arm and Push Rod Replacement

Removal Procedure
1. Remove the valve rocker arm cover.

Important: Mark, sort, and organize all the components for assembly.





2. Remove the valve rocker arms.





3. Remove the valve rocker arm supports.





4. Remove the valve pushrods.

Important: Parts that are to be reused must be marked, sorted, and organized for assembly.

5. Mark, sort, and organize the components for assembly.
6. Clean the components with cleaning solvent.
7. Dry the components with compressed air.





8. Inspect the valve rocker arm components for the following:
^ Valve rocker arm valve pushrod socket contact surface (1)
The contact surface must be smooth with no scoring or excessive wear.
^ Valve rocker arm roller pivot for binding or damage (2)
^ Valve rocker arm valve stem contact surface (3)
The contact surface should be smooth with no scoring or excessive wear.
^ Valve rocker arm bolt threads for damage (4)





9. Inspect the valve pushrods for the following:
^ Restriction of the oil passage (1)
^ Wear or scoring of the end contact surfaces (2)
The end contact surfaces must be smooth with no scoring or excessive wear.
^ Shaft for bends (3)
Roll the valve pushrod on a flat surface to determine if the valve pushrod is bent.





10. Inspect the valve rocker support for excessive wear or damage.

Installation Procedure

Important: Be sure to keep parts in order. Parts must be reinstalled into the original location and position.





1. Install the valve pushrods.

Important: Be sure that the arrow on the valve rocker arm support is in the up position.





2. Install the valve rocker arm supports.





3. Apply prelude GM P/N 12345501 (Canadian P/N 992704) or equivalent to the following valve rocker arm contact surfaces:
^ Valve pushrod socket (1)
^ Roller pivot (2)
^ Valve stem tip (3)

Notice: Refer to Fastener Notice in Service Precautions.





4. Install the valve rocker arm assemblies as follows:
4.1. Finger start the bolt at location (1).
4.2. Finger start the bolt at location (2).
4.3. Finger start the bolt at location (3).
4.4. Finger start the remaining valve rocker arm bolts.





5. Rotate the crankshaft balancer to position the crankshaft balancer alignment mark (1) 57 - 63 degrees clockwise or counterclockwise from the engine front cover alignment tab (2).

Important: Once the valve rocker arm assemblies are installed and properly torqued, no additional valve lash adjustment is required.

6. Tighten the valve rocker arm bolts
Tighten valve rocker arm bolts to 30 Nm (22 ft. lbs.).
7. Install the valve rocker arm cover.