Engine - Intake Manifold Inspection/Replacement
INFORMATIONBulletin No.: 00-06-01-026D
Date: May 02, 2012
Subject: Intake Manifold Inspection/Replacement After Severe Internal Engine Damage
Models:
2013 and Prior GM Passenger Cars and Trucks
Supercede:
This bulletin is being revised to add model years and update the Goodwrench name to Genuine GM Part. Please discard Corporate Bulletin Number 00-06-01-026C (Section 06 - Engine).
- When replacing an engine due to internal damage, extreme care should be taken when transferring the intake manifold to the new Genuine GM Part service engine long block. The internal engine damage may have resulted in the potential discharge of internal engine component debris into the intake manifold via broken pistons and/or bent, broken, or missing intake valves.
- After removing the intake manifold from the engine, the technician MUST carefully inspect all of the cylinder head intake ports to see if the valve heads are still present and not bent. Usually when the valve heads are missing or sufficiently bent, internal engine component debris will be present to varying degrees in the intake port of the cylinder head. If this debris is present in any of the cylinder head intake ports, the intake manifold should be replaced.
- This replacement is required due to the complex inlet runner and plenum configuration of most of the intake manifolds, making thorough and complete component cleaning difficult and nearly impossible to verify the complete removal of debris. Reinstallation of an intake manifold removed from an engine with deposits of internal engine component debris may result in the ingestion of any remaining debris into the new Genuine GM Part service engine. This will cause damage or potential failure of the new Genuine GM Part service engine long block.
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