74. Intake Manifold Installation

Intake Manifold Installation







1. Install the splash shield.







2. Ensure the splash shield (2) snap fits between the cylinder heads (1).







3. Apply a 5 mm (0.2 inch) bead of GM P/N 12346141 (Canadian P/N 10953433) sealer (1) to the 4 engine block/cylinder head locations.







4. Install the new intake manifold end seals.







5. Apply a 5 mm (0.2 inch) bead of GM P/N 12346141 (Canadian P/N 10953433) sealer (1) onto the end seals at the 4 engine block/cylinder head locations.







6. Install the new intake manifold side gaskets onto the cylinder heads.







7. Ensure the intake manifold gasket tabs align with the hole in the head gasket.
8. Ensure the intake manifold gasket tabs align with the slot in the intake manifold end seals.







9. Install the intake manifold onto the engine block.

Notice: Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly, may result in an oil leak and serious engine damage.

Important: The entire intake manifold tightening sequence must be promptly completed due to the anaerobic thread adhesive. The final pass of the tightening sequence must be completed before the adhesive starts to cure, or false torque readings and ineffective thread locking may result.







10. Apply thread adhesive GM P/N 12345382 (Canadian P/N 10953489) or equivalent to a minimum of 8 threads of the intake manifold bolts.
11. Install the intake manifold bolts.

Notice: Refer to Fastener Notice in Service Precautions.
Fastener Notice


12. Tighten the intake manifold bolts 4 passes in sequence:
12.1. Tighten the intake manifold bolts in sequence to 5 Nm (44 lb in) on the first pass.
12.2. Tighten the intake manifold bolts in sequence to 8 Nm (71 lb in) on the second pass. Inspect the intake manifold joints for signs of intake manifold shifting. Correct as required.
12.3. Tighten the intake manifold bolts in sequence to 12 Nm (106 lb in) on the third pass.
12.4. Tighten the intake manifold bolts in sequence to 15 Nm (12 lb ft) on the final pass.

Important: Lubricate the injector O-ring seals with clean engine oil and install onto the spray tip end of each injector.







13. Install the fuel injection fuel rail
14. Install the fuel injection fuel rail studs and/or bolts.
Tighten the fuel injection fuel rail studs and/or bolts to 12 Nm (106 lb in).







15. Install the fuel pressure regulator vacuum hose.