Oil pan gasket leak - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-13-2008, 09:40 PM   #1
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Default Oil pan gasket leak

I have a 97 Bonneville that I changed the oil pan gasket on about 2 years ago. It is now leaking again. Does GM have a mod for it so when I put a new one on it doesn't start leaking again?
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Old 01-13-2008, 09:55 PM   #2
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im not sure what you mean by a mod, but i would only assume that the proper torque was not applied. but are you certain its coming from the pan?


and welcome to BC btw
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Old 01-13-2008, 10:01 PM   #3
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I put torque wrench on it. I have read on some of the defect web sites that GM has put out a service bulletin out on this problem and didn't want to pay for it!
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Old 01-13-2008, 10:05 PM   #4
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I've done mine twice in the 9 years I've owned it. I don't think that'* a problem that GM needs to do something about, unless the 97 is in someway different than my 95.
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Old 01-13-2008, 10:09 PM   #5
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alot of "oil pan" leaks is actually a leaking/loose end plate in the rear of the engine. you have to pull the tranny to get to it. My 97 always had a wet oil pan, when my tranny was out for rebuild we found that plate wasn't even finger tight and the gasket was cracked. Since the gasket replacement my oil pan has been dry.
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Old 01-13-2008, 10:11 PM   #6
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my series 1 had 130k on it and was fine. the only reason i changed it was cuz i changed the timing chain and dropped the pan for coolant.

but idk if there is a problem with the ser 2 oil pans. what is wrong with them?
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Old 01-14-2008, 07:37 PM   #7
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The windage tray on the Series II engines with the stamped steel oil pan uses a Nylon carrier with a silicone embedded gasket... Generally this windage Tray/Gasket will be replaced over the life of the car at least once...

But its also possibe that the rear main cover can start to leak and need a new gasket or retorquing...

I'd say its possible for the rear plate to be leaking..... Also its a short possibility, but maybe the pans sealing surface is not straight?

You'll have to do some more investigating to find the leak....

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Old 01-15-2008, 08:12 PM   #8
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I always torque mine from the center out like you would a cylinder head or intake. Otherwise, you can slightly warp the mating surface and develope a leak
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Old 01-15-2008, 10:21 PM   #9
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Quote:
Originally Posted by TheDude
I always torque mine from the center out like you would a cylinder head or intake. Otherwise, you can slightly warp the mating surface and develope a leak
yes, i forgot to mention that. i do that with everything. even if the book doesnt say to.

good thinkin.
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