Push Rod: Service and Repair

Valve Rocker Arm and Push Rod Replacement

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

For Vehicles equipped with OnStar� (UE1) with Back Up Battery:

The Back Up Battery is a redundant power supply to allow limited OnStar� functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar�module). Do not disconnect the main vehicle battery or remove the OnStar� fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar� module in any way while the ignition is On or with RAP activated may cause activation of the OnStar� Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

1. Disconnect the negative battery cable.
2. Remove the valve rocker cover. Refer to Valve Rocker Arm Cover Replacement Service and Repair.






Important: Keep the components separated in order to install the components in the same location.

2. Remove the rocker arm bolts.
3. Remove the rocker arm pivot balls.
4. Remove the rocker arms.

Important: Keep the pushrods in order in order to install the pushrods in the original position.

6. Remove the pushrods.

Installation Procedure






1. Install the pushrods in the original location.
- Coat the bearing surfaces of the rocker arms and the pushrods with GM P/N 12345501 or GM P/N 88862586 (Canadian P/N 992704 or Canadian P/N 88862586) or the equivalent.
- The intake pushrods are identified with yellow stripes and are 5 3/4 inches long.
- Exhaust pushrods are identified with green stripes and are 6 inches long.
- Ensure that the pushrods seat in the lifter.
2. Install the rocker arms.
3. Install the rocker arm bolts. Refer to Valve Rocker Arm and Push Rod Installation Overhaul.
4. Install the valve rocker cover. Refer to Valve Rocker Arm Cover Replacement Service and Repair.
5. Connect the negative battery cable.