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Old 06-04-2015, 11:28 AM   #1
kevster0522
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1995 SL1
Question Exhaust Problems Advice

Hello all. I was hoping to get some advice for the problems I've been having with my exhaust.

Ever since I got my 95 sl1 there has been a small leak in the flex pipe right before the braiding on it. This has slowly gotten bigger and louder over the years and I finally ordered a replacement pipe. This new pipe bolted onto the exhaust manifold and then slid inside the existing pipe before the cat. I also used permatex ultra copper on the gasket at the top of the pipe. This fixed all the loud exhaust problems.

I usually just stick around the city but I recently went on a short trip (about 70 miles) and by the time I arrived I noticed that the exhaust was significantly louder. After I returned I took the pipe off to have a look around. I discovered all the of the gasket sealer turned into powder and the gasket has been worn away. I've only had this new pipe on for a week!

Should I just replace the gasket and try again? Any advice on the matter would be greatly appreciated. Thank you in advance.
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Old 06-04-2015, 11:48 AM   #2
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Default Re: Exhaust Problems Advice

Clean the pipe flange and the manifold flange. Buy a new gasket, Walker brand preferred, Buy a can of spray galvanize paint, http://www.homedepot.com/p/Rust-Oleu...5838/100142963, You can find this from other sources if you want. Apply 2 or 3 coats to both sides of the new gasket an let it dry between coats. Install gasket and torque. Run car until hot and allow to cool, re-torque. You must have the clamp at the lower support plate installed or the gasket will fail again.

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Old 06-04-2015, 12:27 PM   #3
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Default Re: Exhaust Problems Advice

Thanks for the response OldNuc I will give that a try. Should I also put on the ultra copper gasket stuff again or would that be a bad idea?

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Old 06-04-2015, 12:30 PM   #4
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Default Re: Exhaust Problems Advice

No, just the high zinc pigment paint. The ultra copper can not take the heat, no RTV can.

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Old 06-04-2015, 12:31 PM   #5
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Default Re: Exhaust Problems Advice

Sounds good. Thanks for the help!

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Old 06-05-2015, 10:58 AM   #6
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Default Re: Exhaust Problems Advice

I just wanted to give an update. I believe I fixed the issue. I got a new gasket and sprayed it like oldnuc suggested but when I put everything back together it was still leaking up by the flange by the manifold even after the bolts were as tight as possible. Turns out the problem was that I accidentally secured the pipe too far forward which was causing the pipe to bind and was keeping me from tightening the nuts completely. I loosened all the clamps and pushed the pipe back farther towards the cat and it seems to be sealed now. Thanks for all the help!

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Old 06-05-2015, 11:04 AM   #7
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Default Re: Exhaust Problems Advice

Yes, alignment is critical. The cold galvanize will prevent the gasket from burning up. Retorque after a day of running as the gasket will shrink.

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Old 06-05-2015, 12:47 PM   #8
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Default Re: Exhaust Problems Advice

I used RTV on my exhaust gasket's 3-4 weeks ago, still working fine on my EJ251. This Permatex Red stuff. Exhaust feels like it gets hotter than it did with my LLO's, but I could be wrong. May not be fine on the head flange but the rest should be fine.

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Old 06-05-2015, 01:58 PM   #9
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Default Re: Exhaust Problems Advice

RTV 106, the old style red stuff that poisons O2 sensors, will incinerate slowly at the lower manifold flange on the DOHC and this is the highest temp rated RTV.

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