LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Blown Head Gasket??

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Old 08-19-2007, 10:42 AM
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Default Blown Head Gasket??

I was filling my radiator this morning while the car was running. There were a lot of bubbles coming out of the water and the water level was going down. It will not stay full and there are no leaks. Later on I am going to take a compression test and then drain the oil. One of my friends told me that it sounds like a head gasket. Just wondering if anyone has ever heard of diagnosing a head gasket by seeing bubbles coming out of the coolant while the car is running.
Old 08-19-2007, 11:01 AM
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Its tough to get all of the air out of an LT1 coolant system, so if the coolant level was low you may have bubble in it.

However, you seem to be adding significant amounts of coolant and state (NO LEAKS) so it has to be going somewhere:



I'd do the following checks before digging into the engine

Pull the dip stick and look at the condition of the oil, you should be able to see coolant contamination of your oil if its significant.

check exhuast for white smoke/steam

Seemingly small leaks can be bigger when the car is on the road and the engine is loaded so check every where for leaks, ......do you smell coolant anywhere?
Is the carpet wet on the passenger side?

If nothing pans out I'd go to:

pull and check plugs condition/compression test
coolant test for combustion gases
pressure test the cooling system
Mike

Last edited by aboatguy; 08-19-2007 at 11:22 AM.
Old 08-19-2007, 01:00 PM
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Originally Posted by aboatguy
Its tough to get all of the air out of an LT1 coolant system, so if the coolant level was low you may have bubble in it.

However, you seem to be adding significant amounts of coolant and state (NO LEAKS) so it has to be going somewhere:



I'd do the following checks before digging into the engine

Pull the dip stick and look at the condition of the oil, you should be able to see coolant contamination of your oil if its significant.

check exhuast for white smoke/steam

Seemingly small leaks can be bigger when the car is on the road and the engine is loaded so check every where for leaks, ......do you smell coolant anywhere?
Is the carpet wet on the passenger side?

If nothing pans out I'd go to:

pull and check plugs condition/compression test
coolant test for combustion gases
pressure test the cooling system
Mike
Ditto ^^^, except I'd do the coolant and pressure checks before the compression check since it's a bitch to get to the plugs.
Old 08-19-2007, 01:09 PM
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my friends lt1 had very visable condensation/steam at the tips... ditto aboatguy.
Old 08-19-2007, 04:36 PM
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I looked at the oil and it seemed a bit thin. But no antifreeze mixture. then i bled the system again and so far everything is good. I drove it and it never went past 195-200. I am going to drive it again a lil later. I think It just had air in it. I actually made a taller bleeder for it so it is a lil easier than it was in stock form.
Old 08-19-2007, 06:26 PM
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Hey aboatguy, what's the thing about the passenger carpet being wet?
Old 08-21-2007, 05:35 PM
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Originally Posted by Ralls
Hey aboatguy, what's the thing about the passenger carpet being wet?
Heater core!




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