Donut gaskets? - Vintage Mustang Forums
 
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post #1 of 13 (permalink) Old 10-31-2001, 01:55 PM Thread Starter
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When I got my vert, a couple of months ago, there was an exhaust leak at the donut gaskets. I had them replaced at a reputable muffler shop and the noise went away. Now in the last few days, the noise is returning. Assuming its the donuts again, what could be causing the problem to reappear? I'm a very conservative driver, if that matters, and I'm not aware of any other problems with the engine or exhaust system.

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Randy
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post #2 of 13 (permalink) Old 10-31-2001, 01:59 PM
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It is possible that they have "seated themselves". Have you tried tightening them up?

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post #3 of 13 (permalink) Old 10-31-2001, 02:03 PM
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I think a simple retightening will fix the problem. I believe it's a 5/8 nut. Find four of them on your V8.
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post #4 of 13 (permalink) Old 10-31-2001, 02:04 PM
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Well, Mighty Mouse, the problem is you are a very conservative driver. These donuts were designed with Phil Hill in mind, so get out there and do some donuts![IMG]/forums/images/icons/wink.gif[/IMG]

I think Mr. Sanborn is on the right track....

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post #5 of 13 (permalink) Old 10-31-2001, 02:06 PM
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Yeah, try tightening them up first. Sometimes those rings can change shape due to heat, etc. whether the vehicle is old or newer. Two additional options:
1. Apply a very light coat of high temp sealer (like for header gaskets, etc.) to the rings and reinstall.
2. Have a muffler shop build you a flat flange that attaches diretly to the manifold eliminating the "rings".
3. On one truck in our family, it about drove us all nuts after a year, my dad pulled the rings out, made a copper gasket- it lasted for about 8 years and 160,000 miles on a work truck!
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post #6 of 13 (permalink) Old 10-31-2001, 02:14 PM
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post #7 of 13 (permalink) Old 10-31-2001, 02:19 PM
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What the heck is this Mr. crap?

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post #8 of 13 (permalink) Old 10-31-2001, 02:23 PM
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Isaw they have this limited edition Homer Simpson cereal at the supermarket. It's shaped like donuts and has that expression on the box.
post #9 of 13 (permalink) Old 10-31-2001, 02:36 PM
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Sorry, Dave, my fault. And you can call me Mr. Crap all you want[IMG]/forums/images/icons/wink.gif[/IMG], since I was the one who brought up the kitty litter cake and all......[IMG]/forums/images/icons/laugh.gif[/IMG]

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post #10 of 13 (permalink) Old 10-31-2001, 02:44 PM Thread Starter
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Thanks! I'll try tightening them.

Happy Trails!!
Randy
65 Convert, 289, 4v, C4, PS, AC
Nothing shows poor workmanship like wrinkles in the duct tape!
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post #11 of 13 (permalink) Old 10-31-2001, 02:58 PM
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Ha! Had it for breakfast. SWMBO bought that and the Bart Simpson peanut butter chocolate crunch.

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post #12 of 13 (permalink) Old 11-01-2001, 10:34 AM
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Some of the replacement exhaust required a sleeve insert which the donut set onto. I had this problem with my 69 exhaust. New donuts and the leak was still there. Did not do any good to retighten as in a few days the leak was back. I took it to a muffler shop where the owner also restores cars and he knew what was wrong right away. He inserted the little sleeve, has a ring in the center and the donut sits on top of this, no more problems.
DGC

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post #13 of 13 (permalink) Old 11-01-2001, 10:53 AM Thread Starter
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I tightened the exhaust bolts last night and the noise is gone for now. If it comes back, I'll take it back to the muffler shop with your note. Thanks!

Happy Trails!!
Randy
65 Convert, 289, 4v, C4, PS, AC
Nothing shows poor workmanship like wrinkles in the duct tape!
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