Valve Rocker Arm Cover Replacement - Left

Valve Rocker Arm Cover Replacement - Left
Removal Procedure





1. Partially drain the cooling system. Refer to Draining and Filling Cooling System.
2. Remove the intake manifold cover.
3. Remove the front ignition wire harness at the upper intake manifold and at the spark plugs.
4. Remove the thermostat bypass pipe.
5. Disconnect the positive crankcase ventilation (PCV) vacuum hose.





6. Important: The valve rocker arm cover gasket and sealant must be carefully trimmed away from the lower intake manifold gasket. Failure to do so will damage the lower intake manifold gasket, causing a severe oil leak.

Remove the valve rocker arm cover bolts.

7. Important: When removing the valve rocker arm cover, ensure the gasket stays in place attached to the cylinder head.

Remove the valve rocker arm cover. Bump the end of the valve rocker cover with the palm of your hand or a soft rubber mallet if the cover adheres to the cylinder head.





8. Trim the valve cover and sealant away from the lower intake manifold gasket at the cylinder head to the lower intake manifold joints (1).
9. Remove the valve cover gasket.
10. Clean the sealing surface on the cylinder head with degreaser.
11. Clean the valve rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection.

Installation Procedure





1. Important: Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent, at the cylinder head to the lower intake manifold joint.

Apply sealant at the cylinder head to the lower intake manifold joints (1).





2. Install a new gasket to the valve rocker arm cover. Ensure that the gasket is properly seated in the groove of the valve rocker arm cover.
3. Install the valve rocker cover.

4. Notice: Refer to Fastener Notice.

Important: Use an alternating criss-cross pattern when tightening the valve rocker cover bolts. Failure to do so may result in oil leakage from the valve cover due to improper seating of the gasket.

Install the valve rocker arm cover bolts.
Tighten the bolts to 10 Nm (89 inch lbs.).
5. Connect the PCV valve vacuum line.
6. Install the thermostat bypass pipe.





7. Install the front ignition wire harness.
8. Refill the cooling system. Refer to Draining and Filling Cooling System.
9. Install the intake manifold cover.