78. Valve Rocker Arm Cover Installation - Left

Valve Rocker Arm Cover Installation - Left





1. Clean the sealing surfaces on the cylinder head and the valve rocker arm cover, so that the surfaces are free from oil and foreign material.





Notice: Do not allow the RTV sealant to enter any blind threaded hole. RTV sealant that is allowed to enter a blind threaded hole can cause hydraulic lock of the fastener when the fastener is tightened. Hydraulic lock of a fastener can lead to damage to the fastener and/or the components. Hydraulic lock of a fastener can also prevent the proper clamping loads to be obtained when the fastener is tightened. Improper clamping loads can prevent proper sealing of the components allowing leakage to occur. Preventing proper fastener tightening can allow the components to loosen or separate leading to extensive engine damage.

Important: The RTV should be applied such that it follows and overlaps the stepped ridge. This will distribute RTV on both the upper and lower levels of the step. When the valve rocker arm cover is fastened to the cylinder head, the RTV should flow on to both upper and lower levels of the step.

2. Apply a 5 - 8 mm (3/16 - 5/16 inch) bead of RTV sealant GM P/N United States 12346286, GM P/N Canada 10953472, to the left valve rocker arm cover, inboard of the bolt holes. The sealer must be wet to the touch, when the bolts are tightened.





3. Install the left valve rocker arm cover.

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the left valve rocker arm cover bolts.
^ Tighten the left valve rocker arm cover bolts to 27 Nm (20 ft. lbs.).