GM Tech Tip: Intake Manifold Inspection After Severe Internal Engine Damage – UnderhoodService

GM Tech Tip: Intake Manifold Inspection After Severe Internal Engine Damage

When replacing an engine due to internal damage, extreme care should be taken when transferring the intake manifold to the new 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.
2014 and Prior GM Cars and Trucks 
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. This makes 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 engine. This will cause damage or potential failure of the new engine long block.
Courtesy of MotoLOGIC® Repair & Diagnostics:

You May Also Like

How (And Why!) To Clean An Engine

Beauty is more than skin deep. Here are 11 steps to help clean any car’s engine compartment.

A well-kept car looks amazing when rolling down the street, and it drives better. But, more driving means exposing a car to pebbles, grime, greasy and oily residues, dirt and particles. This unwanted debris can also accumulate under a car’s hood.

For a car owner to enjoy the beauty of a clean car, it’s vital to address the cleanliness of the interior, exterior and under the hood — the engine.

Spark Plug Fouling

Understanding why spark plugs get dirty.

Aging Plastic Intake Components May Cause Leaks

BMW valve covers and intake manifolds made of plastic are susceptible to warpage and gasket failure.

Diagnosing Intercooler Boost Trouble Code P0299

The criteria for setting the code is very basic.

Understanding Coolants

All-season coolant used inorganic acid technology and worked great for almost 30 years.

Other Posts

Misfire Codes P0300, P0301-P0312 and P0313+P0314

The only way to clear the code is to use a crankshaft position relearn with a scan tool.

Belt-In-Oil Timing Systems

Oil contamination of the belt drive has been a death sentence, due to the rubber and fiber construction of the belt.

What Caused The Turbo To fail?

Up to 50% of turbocharger failures are due to oiling problems.

New Oil Specifications

Many 0W16 oils have a new donut certification mark on the bottle called API SN-PLUS and SN-PLUS Resource Conserving.