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Old 07-17-2021, 07:06 PM   #1
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Exhaust doughnuts

Replaced both exhaust doughnuts (7/16/21)


Passenger side one blew while in southern Ca. back on the 11th July (my planned start day to return home). Replaced both but was unable to replace the springs and nuts. Roll forward ~1400 miles...after returning to Renton, Wa. the passenger side one was nearly gone again. I noticed the nuts were bottoming out prior to applying any tension via the springs to the flange-pipe allowing for a leak.


Pulled the pipe down on both sides again and replaced the springs and nuts. Also applied lots of copper seize on everything. Once done I started the engine a few times to heat cycle everything and re-check. All nice and quiet now.


Used Fel-Pro doughnuts.


Also have on order an EGR (electric driven) and a trans filter (will change the trans fluid).
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Old 07-17-2021, 11:30 PM   #2
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https://www.dropbox.com/s/jegzls980o...B1%5D.jpg?dl=0

The one on the left was the one I replaced in southern Ca. The one on the right was what was left of the new one after my return home ~1400 miles (HB,Ca. - Renton, Wa.)

After returning home I dropped the pipe again and installed new springs and nuts. It turns out the springs were 1/4in shorter than the new ones not allowing cinching of the flange against the flare on the pipe to seal. If you do this job replace the springs and nuts and apply lots of copper seize to everything not just the threads on the stud.
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Old 07-18-2021, 08:18 PM   #3
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Had to look up 'doughnuts' as never heard the term, flange i have heard, or exhaust flange coupler - but did correctly guess what you might be referring to.

Surprised they go out if made of good material & correct size (metal), should likely last as long as mufflers do unless taken apart ?

ps: had a catalytic converter 'blow open' going down road, boy was that noisy, not too bad off power but on power awful - sounded like a silly high school boy's exhaust or something.
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Old 07-18-2021, 09:56 PM   #4
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Originally Posted by SmilingSam View Post
Had to look up 'doughnuts' as never heard the term, flange i have heard, or exhaust flange coupler - but did correctly guess what you might be referring to.

Surprised they go out if made of good material & correct size (metal), should likely last as long as mufflers do unless taken apart ?

ps: had a catalytic converter 'blow open' going down road, boy was that noisy, not too bad off power but on power awful - sounded like a silly high school boy's exhaust or something.
They will if the springs have not shortened and lost their spring tension.

When I purchased the new springs the old springs were close to 1/2in shorter than the new ones. Some of the old ones literally had no tension at all when the engine was cold and could be easily slid up/down between the nut and flange. This would cause the doughnut to not seal allowing for air to enter creating a superheated condition on the doughnut burning them away.

Remove the flange old spring and nuts for any reason? New ones go one. Use lots of copper seize when putting back together.
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