Removal Procedure
- Remove the left valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement
- Remove the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement
- Remove the valve rocker arm nut.
- Remove the valve rocker arm with the ball.
- Remove the pushrod.
- Inspect the valve rocker arms and balls at their mating surfaces. There surfaces should be free from wear or other damage.
- Inspect the valve rocker arm areas that contact the valve stems and the socket areas that contact the ends of the pushrods. These areas should be free of damage and wear.
- Inspect the pushrods for scoring or roughness.
- Roll the pushrod on a flat surface in order to determine if it is bent. If the pushrod is bent, the rod will not roll freely. Replace the pushrod if necessary.
Important: If only the pushrod is to be replaced, back the valve rocker arm nut off until the valve rocker arm can be moved away from the pushrod. Then pull the pushrod out.
Important: Store the used components in an exact order, so they can be reassembled in the same position from which they were removed.
Installation Procedure
- Install the pushrod. Make sure that the pushrod seats properly in the valve lifter.
- Install the valve rocker arm and ball.
- Install the valve rocker arm nut.
- Install the valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement or Valve Rocker Arm Cover Replacement .
Important: When new valve rocker arms or balls are installed, coat the contact surfaces with high viscosity oil containing zinc GM P/N 12345501 or the equivalent.
Tighten
Tighten the valve rocker arm nut to 25 N·m (18 lb ft).
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.
