Intake Manifold Replacement (Lower)

REMOVAL PROCEDURE
1. Disconnect the battery negative cable from the battery.
2. Remove the upper intake manifold from the lower intake manifold.
3. Remove the fuel filter from the lower intake manifold.
4. Remove the EGR/Boost solenoids (L56 only) with the bracket from the intake manifold studs.
5. Remove the Boost solenoids (L65 only) with brackets from the Intake Manifold studs.
6. Remove the lower intake manifold stud/bolts from the engine block.
7. Remove the lower intake manifold and the gasket from the engine block.
8. Clean and check the sealing surfaces of the engine block.

INSTALLATION PROCEDURE

IMPORTANT: Be sure to use the correct gasket. The gasket for the L56 models have openings for the EGR Valve, the gaskets for the L65 models do not have openings.





1. Install the lower intake manifold gasket to the cylinder head.
2. Install the lower intake manifold to the cylinder head.





IMPORTANT: There are four stud/bolts, numbers 9, 11, 13, and 15 exposed to the crankcase, and should be sealed with Teflon sealer. Apply threadlocker GM P/N 12345493 to the threads of bolts and studs numbers 1 through 8 and 10, 12, 14, and 16.

NOTICE: Refer to Fastener Notice Service Precautions.

3. Install the lower intake manifold bolts to the cylinder head.
Tighten the bolts to 42 Nm (31 lb ft).

4. Install the EGR/Boost solenoids (L56 only) with the bracket to the intake manifold studs.
Install the Boost solenoids (L65 only) with brackets to the intake manifold studs.
5. Install the fuel filter to the lower intake manifold.
6. Install the upper intake manifold (L56 shown) to the lower intake.
7. Connect the battery negative cable to the battery.