00-06-01-026F

Bulletin No.: 00-06-01-026F
Date: May-2015
Subject:
Intake Manifold Inspection/Replacement After Severe Internal Engine Damage
Models:
2016 and Prior GM Passenger Cars and Trucks
Attention:
This Bulletin also applies to any of the above models that may be Export vehicles.
This Bulletin has been revised to add the 2015-2016 Model Years. Please discard Corporate Bulletin Number 00-06-01-026E.
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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.
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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.
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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.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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