Rocker Arm Assembly: Service and Repair

Valve Rocker Arm and Push Rod Replacement

^ Tools Required
- J 45059 Electronic Torque Angle Meter

Removal Procedure
1. Remove the left or the right valve rocker arm cover.





2. Remove the rocker arm bolts.

3. Remove the valve rocker arms.

Important: Place the parts on a clean surface. Store the components in order so they can be reassembled in the same location and with the same mating surfaces as when removed.






4. Remove the push rod guide plates if all the valve rocker arms are removed.





5. Remove the push rods.
6. Clean the push rods, the valve rocker arms, the bolts, and the guide plates.
7. Clean the valve rocker arm bolts of all thread adhesive.

Installation Procedure
1. Use compressed air in order to blow oil out of the tapped holes in the cylinder head.





2. Lubricate the ends of the push rods with new engine oil.
3. Install the push rods to the same position on the cylinder head.





4. Install the push rod guide plates.





5. Install the valve rocker arms.

6. Apply threadlocker GM P/N 12345493 (Canadian P/N 10953488) or equivalent to the rocker arm bolt threads.

Notice: This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.


7. Install the valve rocker arm bolts.

Notice: Refer to Fastener Notice in Service Precautions.

1 Tighten the bolts to 15 Nm (11 ft. lbs.).
2 Use the J 45059 to rotate the bolts an additional 90 degrees.
8. Install the left or the right valve rocker arm cover.
9. Inspect the valve train for noise.