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Antifreeze keeps running out!!

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Old Dec 28, 2005 | 08:50 AM
  #1  
IROC-Turbo's Avatar
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Antifreeze keeps running out!!

Car is a 91 TBI 305 T-5.I can fill my radiator and watch it pour out the back of the engine-not as fast though.Looking from the top i cant see where its comeing from.Looking from underneath its coming from above the bellhousing and running down the pass side of it.Im also getting water in the oil.I dont remem seeing freeze plugs in this area.Can it be a head gasket blown to the outside??Back of a head cracked??Never heard of a block cracking that high!!

What you guys think will determen whether i pull the engine whole(which i dont really want to do).Then pour water through the thermestat hole till i see where its coming out.Or whether i break it down piece by piece.
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Old Dec 28, 2005 | 09:15 AM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Intake manifold would be my 1st guess.
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Old Dec 30, 2005 | 11:04 AM
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Vader's Avatar
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You could always just pressure test the system.
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Old Dec 30, 2005 | 11:50 AM
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From: Macedonia ,OH
Car: Formula
Engine: 6.0 LSX
Transmission: 4L60E
Axle/Gears: 9 Bolt 3:27
Rear heater hoses to the firewall?
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Old Dec 30, 2005 | 12:22 PM
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From: ready room
Car: NCC-1701-D (docked in AZ)
Engine: impulse drive
Transmission: fusion reactors
Axle/Gears: Rescued from the Borg by my crew
Originally posted by five7kid
Intake manifold would be my 1st guess.
I agree...
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Old Dec 30, 2005 | 12:31 PM
  #6  
Tom 400 CFI's Avatar
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From: Park City, UT
Car: '92 Corvette, '89 1/2-a-'Vette
Engine: LT1, L400
Transmission: ZF6, T5
Axle/Gears: 3.45, 3.31
Originally posted by CaptPicardsZ28
I agree...
Me too.

But;
Originally posted by Vader
You could always just pressure test the system.
-There's a sure way to find out.
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Old Dec 30, 2005 | 02:28 PM
  #7  
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From: Wild Blue Yonder
Car: 1991 RS Camaro
Engine: 350 TBI
Transmission: 700R4
Axle/Gears: 3.42 Posi
Cracked head or blown headgasket? Did you overheat the car before this began happenning?

Sounds like you need to pull some of the A/C stuff out of the way and find where its originating.
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Old Dec 31, 2005 | 08:29 AM
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IROC-Turbo's Avatar
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I bought the car and it was like this.Never found this leak out till i cured the vats prob.The oil was clean when i got it.Filled it with antifreeze and started it(have to hit throttle to get it started).Then oil filled with water and antifreeze started running out.Dont know about its life before hand but i know it sat for atleast a year with a vats issue.

How you pressure test the system??

Thanks
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Old Dec 31, 2005 | 08:56 AM
  #9  
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Remove the radiator cap, install a test cap with a hose fitting, attach a small pump with a gauge, and raise the pressure to 12-14 PSIG (if you can hold that pressure). Any leakage should become apparent unless it is due to warpage as the engine warms.

I didn't catch the part about coolant in the oil in your first post. That's not likely a freeze plug, but is more likely a gasket for the head or intake.

On a positive note, at least you'll be able to get a look at the inner workings of what you bought. For me, if the intake is coming off, it would be a really good excuse to remove the water pump for inspection. Then, since the timing cover is right there, and you have to drain the oil due to contamination anyway, removing the timing cover to check the chain wear would be prident. At that point, the lifter would come out for a quick inspection, and the cam would be screaming to be removed.

However, if the engine still has the swirlie heads (reportedly, some later year TBIs did not) I'd be tempted to resolve that problem.

But test the system first.
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