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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: krafty33 on April 05, 2010, 03:36:42 pm

Title: Exhaust leak
Post by: krafty33 on April 05, 2010, 03:36:42 pm

I have a leak that I think is coming from the collector. It is a 3 bolt flange. I am currently using the donut type gasket. Would I be better of going to the flat gasket or is there another option.

Title: Re: Exhaust leak
Post by: Josh454 on April 05, 2010, 07:59:34 pm

Do you have manifolds or headers?

Title: Re: Exhaust leak
Post by: krafty33 on April 05, 2010, 09:59:04 pm

Headers

Title: Re: Exhaust leak
Post by: beastie_3 on April 05, 2010, 11:55:34 pm

Is it a continuous problem, or has it developed over time? If its a one time thing, then you should be able to fix it and call it good.

Make sure your exhaust piping is well supported down the line also.

Title: Re: Exhaust leak
Post by: Irish_Alley on April 06, 2010, 12:17:00 am

i never had a problem with just the flat gaskets as long as you use bolts with lock washers so they don't back out, i think i got the alum ones from autozone in their "performance" section

Title: Re: Exhaust leak
Post by: Blue 82 on April 06, 2010, 07:08:32 pm

Using a high temp locknut on the bolts will help em from blowin out
One type of high temp locknut is a Stover Nut
The threads on the tapered end will be oval or have a triangular shape
(http://www.fastfixdirect.co.uk/images/prodimages/P481C.jpg)

Flex type locknuts work well in High temp applications also
(http://scfastening.thomasnet.com/ImgMedium/Flex-Type%20Locknut%20Cadmium%20Plated-Long.jpg)