Uplander AWD V6-3.5L VIN 8 (2005)
Important: All gasket-mating surfaces need to be free of oil and foreign material. Use GM P/N 12346139 (Canadian P/N 10953463), or
equivalent, to clean surfaces.
1. Install the lower intake manifold gaskets.
2. Install the valve rocker arms and pushrods.
3. With gaskets and seals in place apply a small drop 8-10 mm (0.31-0.39 inch) of RTV sealer GM P/N 12378521 (Canadian P/N 88901148), or
equivalent, to the 4 corners of the intake manifold to block joints (1).
4. Install the lower intake manifold.
Notice: Maximum gasket performance is achieved when using new fasteners, which contain a thread-locking patch. If the fasteners are not
replaced, a thread locking chemical must be applied to the fastener threads. Failure to replace the fasteners or apply a thread-locking chemical
MAY reduce gasket sealing capability.
Notice: Failure to tighten vertical bolts before the diagonal bolts may cause an oil leak.
5. Apply sealer GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the lower intake manifold bolt threads.
Notice: Refer to Fastener Notice in Service Precautions.
6. Install the new lower intake manifold bolts, if applicable, in sequence.
1. Tighten the lower intake manifold bolts in sequence to 13 Nm (115 inch lbs.) on the first pass.
2. Tighten the lower intake manifold bolts (1, 2, 3, 4) in sequence to 20 Nm (15 ft. lbs.) on the final pass.
3. Tighten the lower intake manifold bolts (5, 6, 7, 8) in sequence to 25 Nm (18 ft. lbs.) on the final pass.
