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Old 02-20-2003, 12:20 PM   #1
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BEST Exhaust Leak Sealant

Since putting on some new Hedman Hedders and Y-pipe, I have got one hell of an exhaust leak. Anyone know what the best sealant is for this situation? Thanks for any replies.

Will
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Old 02-20-2003, 01:05 PM   #2
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i havent tried this yet but i bought a book of 1001 high performance tech tips by wayne scraba? it said before installing header or exhaust gaskets to soak them in water for around 20 mins. cant remember why off hand. also make sure u have the bolts and everything as tight as they can go.
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Old 02-20-2003, 01:18 PM   #3
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Thanks for the response

I will have to try that tip with the soaking in water. I have tightened them down as much as can be done.
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Old 02-20-2003, 02:15 PM   #4
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I have heard many times that Hedmans are prone to leakage. Its the crappy collectors..
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Old 02-20-2003, 02:27 PM   #5
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ultra-copper RTV is a high temp sealant. try it. i have even had good luck with regular red high temp rtv before. some good soft-aluminum gaskets will work real well and they are resuable. you can also get reusble aluminum collector gaskets.
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Old 02-20-2003, 03:38 PM   #6
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Quote:
Originally posted by darbleinad
ultra-copper RTV is a high temp sealant. try it. i have even had good luck with regular red high temp rtv before. some good soft-aluminum gaskets will work real well and they are resuable. you can also get reusble aluminum collector gaskets.
I'll second that. I've used several different gasket types (regular, copper, dead soft aluminum) and spent nearly $100 in doing so. They ALL leaked! I finally bought a tube of Permatex Ultra-Copper and have never had a problem since.
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Old 02-25-2003, 11:24 AM   #7
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did you ever use the permatex between the flange and the heads or just the collectors?
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Old 02-25-2003, 11:27 AM   #8
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Quote:
Originally posted by strokedtpi
did you ever use the permatex between the flange and the heads or just the collectors?
i have never used it between the header flange and heads but i have heard of people doing it. i have always used the the reusuable soft aluminum gaskets there. they work very well. i have just used the RTV on the collectors.
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Old 02-26-2003, 05:21 PM   #9
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All the headers I've used were ball flange type collectors. I used the Ultra Copper on the header flange/head.
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Old 02-26-2003, 11:37 PM   #10
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Re: BEST Exhaust Leak Sealant

Quote:
Originally posted by TBIformula91
Since putting on some new Hedman Hedders and Y-pipe, I have got one hell of an exhaust leak. Anyone know what the best sealant is for this situation? Thanks for any replies.

Will

is the leak from below the engine?


the y pipe needs to be welded on all the way around. that slip fit is ment to be welded.


take it to a shop, have them tack weld it then unbolt the y pipe and have it welded all the way around.


as for teh header gaskets, the ones that it comes with will work great once retorqued once. if you remove the headers they will tear and leak. if you remove the headers, get some nice copper header and collector gaskets... i got mine from summit... they can be reused about 4 or 5 times... and dont leak. they should not require re torquing either.




btw NEVER use RTV on exhaust. even "high temp" copper stuff... and dont bother with thoes exhaust puddys either.. or any of that other cr-ap. if you're going to bother fixing somthing, atleast fix it correctly.

PS i know for a fact that JB weld melts and smokes on exhaust pipes. regardless of what anyone tells you, do NOT use it. it is NOT a replacement for a real weld.
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Old 02-27-2003, 08:58 PM   #11
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Sealant? You don't use sealant for exhaust leaks. You fix them by replacing the gaskets, tightning things, or welding.
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Old 03-01-2003, 02:45 PM   #12
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Are the collector bolt-flanges on your headers welded on or are they the kind that can be moved around? If they are welded onto the collector, as some are, you may want to check to see if they are bent. If they are bent, then you may have to pull them out to starighten them. I'm not sure if this is as important for the movable flanges though.
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Old 03-01-2003, 04:48 PM   #13
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Quote:
Originally posted by rezinn
Sealant? You don't use sealant for exhaust leaks. You fix them by replacing the gaskets, tightning things, or welding.


A good trick when replacing gaskets is to use vortec exhaust manifold gaskets. They are just like headder gaskets and seal better then cheapo Mr Gasket even better then the felpro headder gaskets, they dont break or wear as quickly either and I need to mention $8
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Old 03-02-2003, 10:06 AM   #14
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Quote:
Originally posted by darbleinad
ultra-copper RTV is a high temp sealant. try it. i have even had good luck with regular red high temp rtv before. some good soft-aluminum gaskets will work real well and they are resuable. you can also get reusble aluminum collector gaskets.
they best stuff i have found to date, but i kinda stopped looking once i found this stuff, it will work
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Old 03-02-2003, 10:50 AM   #15
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I have the ultra copper sealant on my cat-y-pipe seam, it's been there for a month or so now, hasn't burned off and is still soft even. I think they say it's good to 700+*F.

JB weld is just an epoxy with metal powder in it.
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Old 03-02-2003, 10:50 AM
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