86. Lower Intake Manifold Installation

Lower Intake Manifold Installation (L32)




1. Clean the lower intake manifold sealing surface using GM P/N 12346139 (Canadian P/N 10953463) or equivalent prior to installing any seals or gaskets.
2. Install the lower intake manifold gaskets and seals.
3. With gaskets and seals in place, apply a small drop 8-10 mm (0.31-0.39 in) 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.
5. Apply Threadlocker 272 GM P/N 12345493, (Canadian P/N 10953488) to the bolt threads.





Notice: Refer to Fastener Notice in Service Precautions.

6. Install the lower intake manifold bolts including the two hidden bolts.

Tighten the bolts in sequence to 15 N.m (11 lb ft).