76. Valve Rocker Arm Cover Installation

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 into the valve rocker arm cover bolt holes. This may cause a hydraulic lock condition, when the bolts are tightened, damaging the cylinder head casting.

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 12346286 to the valve rocker arm covers, inboard of the bolt holes. The sealer must be wet to the touch, when the bolts are tightened.





3. Install the valve rocker arm cover.

Notice: Refer to Fastener Notice in Service Precautions.

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