Lookin 4 some help. small block 350 water in oil

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Old 03-07-09, 12:46 PM
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Lookin 4 some help. small block 350 water in oil

Hey guys, i have a 1999 gmc 2500 with a 5.7, theres water in the oil. Is it defenitly a blown head gasket? or could there be another cause??
Thank you for reading this and for your advise.

Nate
 
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Old 03-07-09, 01:15 PM
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would suspect an intake gasket first while a head gasket is possible if you pull the intake and look at the gasket closely you should be able to tell if it was leaking.
 
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Old 03-07-09, 01:16 PM
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Unless someone has poured water in your oil fill hole, I would conclude that you have a blown head gasket.

good luck and have a great day
 
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Old 03-07-09, 02:52 PM
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Lookin 4 some help. small block 350 water in oil

GM has had big problems with intake manifold gaskets failing on cars of that era. They claim it is the anti-freeze they put in the car and the antifreeze people say the plastic gaskets are no good. - No recalls as far as I know.

I had a problem with a failed intake manifold gasket on my 4.3L Jimmy Vortec V6. My mechanic sees them frequently and just replaced one on his wife's car. He would not replace it with the same type of gasket. - What he wants to use is a little pricier.

It took a few hours of labor, but he has the equipment and knowledge and does not charge double for some jobs that are combined, like the books say. since had it apart, he flushed the cooling system and put on a new serpentine belt for no extra labor. - I have a couple of years of good experiences with him and he said, I could have waited a while, but there was not much reason to take a chance since it already failed in one area.

Just ask a few questions when you have someone look at it.

Dick
 
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Old 03-07-09, 05:39 PM
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Intake gasket failure common on the 350. Failed on mine =(.
 
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Old 03-09-09, 06:53 PM
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He would not replace it with the same type of gasket. - What he wants to use is a little pricier.

GM has a TSB about updated gaskets for these applications...I believe you are to use the green border gaskets as opposed to the orange
 
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Old 03-10-09, 04:35 AM
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probably the intake. a leak down test would rule out the head gasket.
 
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Old 03-14-09, 07:20 PM
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[QUOTE=Concretemasonry;1534137]GM has had big problems with intake manifold gaskets failing on cars of that era. They claim it is the anti-freeze they put in the car and the antifreeze people say the plastic gaskets are no good. - No recalls as far as I know.

Sir, I have a 1994 Silverado 5.0L(305) that is pouring oil from underneath. I was told twice by some shadetree machanics that say it is the rear main seal. I went to a machanic that has worked on my truck before(did a great job for not much money), and he said he had seen alot of motors where it is a suspected rear seal when in fact it was a leak at the rear of the intake. Something about how the gasket is made.
Would that let oil pour out at a place that mimics rear main seal?

Does that sound like the same as what you are talking about?

Chaplain.D
 
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Old 03-14-09, 08:34 PM
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Chaplain:

If it's the rear main the oil will come from inside the bell housing. If it's coming from the intake or other than the rear main the oil will be running down the outside of the bell housing.

The discussion above is concerning an intake manifold gasket leaking antifreeze to the inside of the engine, into the oil.
 
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Old 03-16-09, 05:25 AM
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Is it antifreeze in the oil or water in the oil?
 
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Old 03-28-09, 02:51 PM
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Thanks for all the insite guys, looks like its time for me to play mechanic.
There was water/antifreeze in oil. the radiator was mostly water.
 
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Old 04-12-09, 11:33 PM
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probably the intake. a leak down test would rule out the head gasket.

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