74. Intake Manifold Installation
Intake Manifold InstallationNotice: Apply the proper amount of the sealant when assembling this component. Excessive use of the sealant can prohibit the component from sealing properly. A component that is not sealed properly can leak leading to extensive engine damage.
Important: The lower intake manifold must be Installed and the fasteners tightened while the adhesive is still wet to the touch.
1. Apply a 4.0 mm (0.157 inch) patch of adhesive GM P/N United States 12346141, GM P/N Canada 10953433, or equivalent, to the cylinder head side of the lower intake manifold gasket at each end.
2. Install the lower intake manifold gasket onto the cylinder head. Use the gasket locator pins in order to properly seat the lower intake manifold gasket onto the cylinder head.
Notice: Apply the proper amount of the sealant when assembling this component. Excessive use of the sealant can prohibit the component from sealing properly. A component that is not sealed properly can leak leading to extensive engine damage.
Important: All sealing surfaces must be clean, free of oil, dirt, or any other foreign material.
3. Apply a 5 mm (0.197 inch) bead of adhesive GM P/N United States 12346141, GM P/N Canada 10953433, or equivalent, to the front top of the engine block.
4. Extend the adhesive bead 13 mm (0.50 inch) onto the each lower intake manifold gasket.
5. Apply a 5 mm (0.197 inch) bead of adhesive GM P/N United States 12346141, GM P/N Canada 10953433, or equivalent, to the rear top of the engine block.
6. Extend the adhesive bead 13 mm (0.50 inch) onto each lower intake manifold gasket.
7. Install the lower intake manifold onto the engine block and the cylinder heads.
Notice: Refer to Fastener Notice in Service Precautions.
8. Apply threadlock GM P/N United States 12345382, GM P/N Canada 10953489, or equivalent, to the threads of the lower intake manifold bolts.
Notice: Proper lower intake manifold fastener tightening sequence and torque is critical. Always follow the tightening sequence, and torque the intake manifold bolts using the 3 step method. Failing to do so may distort the crankshaft bearing bore alignment and cause damage to the crankshaft bearings.
9. Install the lower intake manifold bolts.
9.1. Tighten the bolts on the first pass in sequence (1-8) to 3 Nm (27 inch lbs.)
9.2. Tighten the bolts on the second pass in sequence (1-8) to 12 Nm (106 inch lbs.).
9.3. Tighten the bolts on the final pass in sequence (1-8) to 15 Nm (11 ft. lbs.)
10. Connect the Evaporative Emission (EVAP) canister purge solenoid valve harness.
10.1. Push the elbow inward until the quick connect snaps into place.
10.2. Pull the elbow outward in order to ensure proper connection.