1. Remove the valve rocker arm cover(s). Refer to Valve Rocker Arm Cover Replacement .



2. Remove the rocker arm bolt(s).

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.

3. Remove the valve rocker arm(s).



4. Remove the push rod guide plate(s) if all the valve rocker arms are removed.



5. Remove the push rod(s).
6. Clean the push rod(s), the valve rocker arm(s), the bolt(s), and the guide plate(s) in a suitable solution.
7. Clean the valve rocker arm bolt(s) of all thread adhesive.

Tools Required

J 36660-A Electronic Torque Angle Meter

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



2. Lubricate the ends of the pushrod(s) with new engine oil. Install the push rod(s) to the same position the push rod(s) was removed from.



3. Install the push rod guide plate(s).



4. Install the valve rocker arm(s).

Notice: This bolt is designed to permanently stretch when tightened, and therefore MUST be replaced anytime it is removed. 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.

5. Apply GM P/N 12345493 threadlocker or equivalent to the rocker arm bolt threads

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

6. Install the valve rocker arm bolt(s).

Tighten
Tighten the valve rocker arm bolt(s) to 15 N·m (11 lb ft). Use the J 36660-A in order to rotate the bolts an additional 90 degrees.

7. Install the valve rocker arm cover(s). Refer to Valve Rocker Arm Cover Replacement .
8. Inspect the valve train for noise.