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Author Topic:   Header leak help
tc67pony
Journeyman

Posts: 12
From: st. louis, mo , usa
Registered: Aug 2001

posted 08-15-2001 05:20 PM     Click Here to See the Profile for tc67pony     Edit/Delete Message   Reply w/Quote
I have a really bad header leak on the #1 cylinder and I've chaged the gasket a few times and uesd mr.gasket ultra seal and that doesn't help. I was wondering if those copper gaskets would fix the problem, if not any ideas?

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JAAZZY
Gearhead

Posts: 776
From: Bay Area, CA
Registered: Apr 2001

posted 08-15-2001 06:22 PM     Click Here to See the Profile for JAAZZY     Edit/Delete Message   Reply w/Quote
I would guess that you have a slightly bent header if gasket changes aren't working.

One thing I did in the past with my Tri-Ys was to soak the gaskets overnight in water and then install them the next day. After the exhaust got good and hot I'd let it sit for a while and retorque them. Usually worked for me.

The only other thing I can think of is this metal reinforced cement like substance my local muffler shop uses. I've never used it between the heads and headers but I used it on the flanges and it worked great. I can't remember what it's called but something like Muffler cement.


quote:
Originally posted by tc67pony:
I have a really bad header leak on the #1 cylinder and I've chaged the gasket a few times and uesd mr.gasket ultra seal and that doesn't help. I was wondering if those copper gaskets would fix the problem, if not any ideas?

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bluestreek
Gearhead

Posts: 1724
From: Athens,GA
Registered: Jul 2001

posted 08-15-2001 07:21 PM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I think Jaazzy is on the right track..
The copper coated gaskets should stand up better to heat, but you definately need to retorque all the bolts after the engine cools from a full temperature run session. I repeat this about 4 times until it stays tight.. Then check them again ever so often..
.. You may want to pull the one off that's giving you trouble and check the mating surface for any cracks or low spots.. The burned gasket and flange should make it pretty obvious.. Hot exhaust pressure can cut through anything, if given the slightest chance of a leak.. When all else fails, I have used 2 gaskets to seal up stubborn manifolds.

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Doc
Gearhead

Posts: 466
From: Redwood City, Ca. USA
Registered: Jan 2001

posted 08-15-2001 08:39 PM     Click Here to See the Profile for Doc   Click Here to Email Doc     Edit/Delete Message   Reply w/Quote
You might also try tighting #1 first then work back to help flaten the header flange, many times hi temp (orange) silicone without a gasket works best, don't use much though it can get real ugly with that bright orange crap slithering out for all to see .

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If you had a rubber cam would it get wilder as the RPMs go up?

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