56. Intake Manifold Clean and Inspect - Lower

Intake Manifold Cleaning and Inspection - Lower

^ Tools Required
- J 21882 Oil Suction Pipe Installer





1. Remove the engine coolant temperature sensor





2. Remove the intake manifold coolant pipe bolt if required.
3. Remove the intake manifold coolant pipe, if required.





Important: Use GM P/N 12346139 (Canadian P/N 10953463) or equivalent to clean the intake manifold mating surfaces.

4. Clean the intake manifold gasket mating surfaces.
5. Clean the fuel injector bores.
6. Inspect the threaded holes for damage.
7. Inspect the intake manifold mating surfaces for damage. Repair or replace the intake manifold as necessary.





8. Apply sealant GM P/N 12345493 (Canadian P/N 10953488) to the end of a new intake manifold coolant pipe.
9. Install the intake manifold coolant pipe using the J 21882.

Notice: Refer to Fastener Notice in Service Precautions.

10. Install the intake manifold coolant pipe bolt.
^ Tighten the intake manifold coolant pipe bolt to 10 Nm (89 inch lbs.).





11. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the engine coolant temperature sensor.
12. Install the engine coolant temperature sensor.
^ Tighten the engine coolant temperature sensor to 23 Nm (17 ft. lbs.).