Lower Intake Manifold: Installation
NOTE:
When replacing lower intake manifold gasket, a revised intake manifold gasket has been introduced by manufacturer. This new design gasket helps resolve issues related to intake manifold oil/coolant leaks. The gasket requires a revised torque specification and procedure in addition to the use of NEW revised intake manifold bolts. Please review TSB ENGINE OIL OR COOLANT LEAK (INSTALL NEW INTAKE MANIFOLD GASKET)
for complete information.
- Clean all gasket mating surfaces. Install lower intake manifold gaskets. With the gaskets in place, apply a 0.31-0.39" (8-10 mm) drop of GM® RTV sealer (12346286 US; 10953472 Canada) or equivalent to the 4 corners of the intake manifold-to-block joint. Connect the drops at both ends on the ridge where the front and rear of lower intake manifold contacts the block with a bead of RTV sealer that is 0.31-0.39" (8-10 mm) wide and 0.12-0.20" (3.0-5.0 mm) thick.
- Install push rods into original position and tighten rocker arms to specification. See TORQUE SPECIFICATIONS . Install lower intake manifold. Apply Sealant (12345282) to bolt threads.
- Hand tighten vertical bolts. Hand tighten diagonal bolts. Tighten bolts to specification. See TORQUE SPECIFICATIONS . See Fig 1. To complete installation, reverse removal procedure.
NOTE:
All gasket-mating surfaces need to be free of oil, and foreign material.
NOTE:
An oil leak may result if vertical bolts are not tightened before diagonal bolts.