Cleaning and Inspection Procedure - Conditional

NOTE:

Perform the following cleaning and inspection or overhaul steps, as necessary. ONLY perform steps when components are removed with the intention of reinstallation.

WARNING:

Refer to Safety Glasses and Compressed Air Warning .

Intake Manifold

Courtesy of GENERAL MOTORS COMPANY

Clean all sealing surfaces.
Dry the intake manifold with compressed air.
Inspect the intake manifold cylinder head deck for warpage.
Place a straight edge (1) across the intake manifold cylinder head deck surface.
Inspect the intake manifold for the following conditions:
1. Inspect for loose threaded inserts or studs.
2. Inspect for damaged or broken vacuum fitting.
3. Inspect the intake manifold assembly for cracks or other damage.
4. Inspect for damaged intake manifold gasket sealing surfaces.
Position the straight edge (1) across a minimum of two runner port openings and check for warpage using a feeler gage. Engine Mechanical Specifications (L84)
Inspect the ventilation system passages for restrictions.