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Old March 13th, 2012, 12:01 AM   #1
chevyk10
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Default 96 Cutlass LIM Gasket (UPDATED)

I have a 96 Cutlass Supreme and it started leaking coolant from the back of the block (looks as if its coming from between the head / block). My first guess was a head gasket, but I've also been told it could be an intake gasket. The car runs very smooth, no white smoke, but seems it might have oil in the coolant, but the oil looks fine. Any ideas? I basically bought this car on Sunday and got screwed.

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Old March 13th, 2012, 12:06 AM   #2
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intake gasket... buy the upgraded steel gaskets.. easy job... and its very common..
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Old March 13th, 2012, 12:22 AM   #3
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intake gasket... buy the upgraded steel gaskets.. easy job... and its very common..
Thanks, I'm really hoping its the intake. Looks like its leaking coolant from front and back of the block in a few different places around where the intake gasket is. I over payed for the car big time but at least its in good shape with new tires and a very smooth running 3100. If it was a head gasket I'm guessing it would have coolant in the oil then?
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Old March 13th, 2012, 12:32 AM   #4
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well.. no.. it would be burning the coolant or leaking it outside the block.. if the intake gaskets were wasted it would put coolant in the oil.. get em changed asap. to prevent overheating and head gasket failure.
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Old March 13th, 2012, 12:35 AM   #5
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well.. no.. it would be burning the coolant or leaking it outside the block.. if the intake gaskets were wasted it would put coolant in the oil.. get em changed asap. to prevent overheating and head gasket failure.
It probably needs head gaskets and intake then, and since I'll already have the intake off I might as well take the heads off too. Its pissing coolant out the back side of the block pretty bad by the intake, but barely leaks out the front. Maybe the gasket is bad in more than 1 spot?

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Old March 13th, 2012, 02:11 AM   #6
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Really glad I just found this site cause this is exactly what the leaks look like on my car. Gonna start tearing into the motor this weekend...

http://www.d-tips.com/general/articl...icle.aspx?id=2
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Old March 19th, 2012, 01:46 AM   #7
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Took 4.5 hours of labor including marking all wires with tape to help re-intall them. I've never done this job before except for on an F150, and it was difficult, but really not all that bad, just very time consuming. Will be installing new gasket and putting everything back together next week. As you can see the junk gasket cracked along the coolant passage to the rear of the motor allowing coolant to spray out between the intake. Check out pic number 1.
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Old March 19th, 2012, 02:08 AM   #8
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Now can anyone tell me where I can find the torque specs for the lower and upper manifolds?
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Old March 25th, 2012, 10:49 PM   #9
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this is super common on these motors, mine has 150,000 and has been done 3 times. is your car a 2 door or 4 door?? just out of curiosity.
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Old March 26th, 2012, 09:33 AM   #10
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this is super common on these motors, mine has 150,000 and has been done 3 times. is your car a 2 door or 4 door?? just out of curiosity.
Mines a 4 door with 188k. I just replaced the gaskets yesterday with new Felpro metal ones so I'm hoping that fixes everything. Haven't got a chance to start it up yet cause I was waiting for the RTV to dry. The old gaskets were so bad and cracked in about 4 different places.
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Old March 26th, 2012, 09:07 PM   #11
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lower:

Apply sealer GM P/N 12345382 or equivalent to the lower intake manifold bolt threads.

NOTICE: Failure to tighten vertical bolts before the diagonal bolts may cause an oil leak.

Tighten the lower intake manifold center bolts in sequence to7 Nm (62 inch lbs.). first pass
Tighten the lower intake manifold center bolts in sequence to 13 Nm (115 inch lbs.). final pass
Tighten the lower intake manifold diagonal bolts in sequence to 13 Nm (115 inch lbs.) first pass.
Tighten the lower intake manifold diagonal bolt in sequence to 25 Nm (18 ft. lbs.) final pass.


upper:


Apply thread-lock GM P/N 12345382 or equivalent to the threads.

Tighten the upper intake manifold bolts and studs to25 Nm (18 ft. lbs.).

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