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post #1 of (permalink) Old 11-13-2002, 02:33 PM
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IS the header gasket crtitical to repair?

My jeep started vibrating when I down shift and during some accelaration. I checked for evident broken U-joints but nothing is obvious. The only thing I noticed is under the hood, the gasket for the intake (header is partially sticking out on one of the cylinder entrances. Could this be what is causing my vibration during eangine braking/down shifting / accelaration? If it is, how long does this repair normally take with adequate tools?
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post #2 of (permalink) Old 11-13-2002, 05:14 PM
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Re: IS the header gasket crtitical to repair?

The intake is a manifold. Headers are for exhaust and are generally made of steel tube welded together. Exhaust manifolds are cast iron.

Now, if it's an intake manifold gasket, it should be fixed pronto because the engine is sucking air, making that cylinder lean, and if the engine is fuel injected, making all the other cylinders rich. Engine damage can result.

If it's an exhaust manifold or header, the gasket probably won't cause any damage quickly. Long term it can cause some damage, but noise and the CO leak are more significant problems.

Neither condition can cause a vibration when you're off the pedal, but a badly leaking intake can cause the engine to run rough and miss at idle and under power.

Assuming it's a 6-cylinder, it's anywhere from an hour to an afternoon or more depending on your skill and a few things such as what accessories might be bolted to the manifolds, how badly the studs are rusted, and so on. It's one of those jobs that can turn into a nightmare of broken studs.
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post #3 of (permalink) Old 11-13-2002, 06:19 PM
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Re: IS the header gasket crtitical to repair?

Thanks for the input Jim, I aplogize for the missed names of the parts, it's been a while since I get under my jeeps hood.

However, it is the Manifold and the gasket is sticking out from the 2 middle cylinder (4-cylinder 2.5 motor) which is TBI.

I will get on top of that job this weekend, hopefully I wont run in to toomany snags. My Yj is a 89 and I do know I am missing at least one stud. Any further advise on trying to figur eout where the heck the vibes are coming from would be apreciated from anyone. Thank you
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