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.





10. 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 prior to the curing of the bolt threadlocking and intake manifold sealing materials. Failure to do so may result in false torque readings and ineffective bolt threadlocking.
^ DO NOT use the original intake manifold bolts again during assembly.

Install the NEW intake manifold bolts.

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

Tighten the intake manifold bolts (1-10) in sequence, using 4 passes.
1. Tighten the intake manifold bolts a first pass in sequence to 5 Nm (44 inch lbs.).
2. Tighten the intake manifold bolts a second pass in sequence to 8 Nm (71 inch lbs.). Inspect the intake manifold joints for signs of intake manifold shifting. Correct, as required.
3. Tighten the intake manifold bolts a third pass in sequence to 12 Nm (106 inch lbs.).
4. Tighten the intake manifold bolts a final pass in sequence to 15 Nm (11 ft. lbs.).





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

Install the fuel injection fuel rail with injectors.
13. Install the fuel injection fuel rail bolts/studs.
Tighten the fuel injection fuel rail bolts/studs to 12 Nm (106 inch lbs.).





14. Install the throttle body gasket (501) and throttle body (502).
15. Install the throttle body nuts (503).
Tighten the throttle body nuts to 10 Nm (89 inch lbs.).





16. Install the vacuum plug (513).