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Old 08-27-2010, 10:23 PM
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Intake manifold gaskets

Ok just pulled my intake manifold off my 5.7 chevy tbi engine. I can't say that I physically seen or heard the leak. The leak is based on what the dealership diagnosed. Now that I physically have the gasket out, what signs do I look for that confirms my intake manifold was actually leaking? I sure do hope the dealerships diagnosis was correct. Money and time has surily effected my pocketbook. No burn marks on gasket, somebody did use RTV on the gasket surface and there are uneven pressure marks that shows uneven torque. What else would be a sure sign? Sprayed the intake manifold down with some engine cleaner, will be cleaning all surfaces tomorow. I bought a gasket set at the dealership and was given two intake gasket and a gasket for the distributer. Its questionable if I should of been given two more small gasket for each end. One dude said use the grey silicone and would work just fine for the ends. Of course another dude said I need ths gaskets. What is ya'lls' opinion?

Tommy

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Old 08-27-2010, 10:31 PM
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Use a bead of silicone in place of the end gaskets. The end gaskets often end up squeezing out, so most mechanics throw them away.

Leaks acrossed an intake gasket are hard to spot, even for a seasoned mechanic. If the leak was to the underside(lifter valley) there will be a faint oil track acrossed the gasket. Leaks to outside air are hardly visible. Both are easily missed, thus the many methods of leak testing a running engine for vacuum leaks.

You shouldn't find any burn marks on an intake gasket.
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Old 08-29-2010, 05:54 AM
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Success at lsat

Just finished installing a intake manifold gasket on my 1987 Chevy 5.7 tbi suburban and the engine is running very smooth and has a quite of a bit more power. When I pulled the manifold I discovered that the EGR port was completley blocked and I wonder why I couldn't pass emmissions. Anyways my question is should I re-torque my intake manifold bolts after any certain period? The bolts got a 30lb torque on them now?

Tommy
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Old 08-29-2010, 06:40 AM
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It's always a good idea to check Intake & Valve covers etc.. after several heat cycles. Usually the Intake will be fine but V covers will need to be tightened.
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