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Exhaust donut burnout

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cmm24601
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Joined: Sat Jun 04, 2016 5:28 pm

Exhaust donut burnout

Post #1 by cmm24601 » Mon Jun 19, 2017 9:03 pm

So I replaced the exhaust donut a couple of weeks ago. After about 200 miles I noticed a leak again and just discovered the thing is completely burned up. Just the thin metal ring is left. The engine is running fine. Normal temp, between 160 and 190.

Is this a result of improper installation?
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

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chad
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Re: Exhaust donut burnout

Post #2 by chad » Tue Jun 20, 2017 7:29 am

I'm thinking the flange was not tightened up'n square?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

CZLN6
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Re: Exhaust donut burnout

Post #3 by CZLN6 » Tue Jun 20, 2017 10:28 am

Howdy:

Probably due to a leak of hot exhaust gases. Is the firewall intact?

Good luck.

Adios, David
co-author of the Falcon Performance Handbook
http://www.falcon6handbook.com/

cmm24601
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Re: Exhaust donut burnout

Post #4 by cmm24601 » Tue Jun 20, 2017 2:16 pm

All is intact. One of the studs connecting the flange to the exhaust manifold is in need of replacement. I think that kept me from being able to tighten down and align the gasket correctly.
1969 Mustang Grande
250 inline 6
Automatic Transmission
Autolite 1101 Carb

cobraguy
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Re: Exhaust donut burnout

Post #5 by cobraguy » Tue Jun 20, 2017 4:12 pm

I had problems keeping my exhaust pipe from loosening up at the manifold. I finally took it to an exhaust shop and they made a support bracket and bolted it to the block and used a muffler clamp on the pipe about 6" down from the manifold flange. Haven't had a problem since.
62 Falcon 2 dr sedan 250/C4 8" "Magoo"
63 Ranchero 200/SROD DS II, Weber "Barney" SOLD

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xctasy
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Re: Exhaust donut burnout

Post #6 by xctasy » Tue Jun 20, 2017 5:01 pm

cobraguy wrote:I had problems keeping my exhaust pipe from loosening up at the manifold. I finally took it to an exhaust shop and they made a support bracket and bolted it to the block and used a muffler clamp on the pipe about 6" down from the manifold flange. Haven't had a problem since.



Has to have the support bracket. They existed for the bigger 250's and later cars. The take care of the shaking movment of the whole exhaust.
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chad
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Re: Exhaust donut burnout

Post #7 by chad » Tue Jun 20, 2017 6:32 pm

cobraguy wrote:... and they made a support bracket and bolted it to the block and used a muffler clamp on the pipe about 6" down from the manifold flange...

Thnx!!!
Got a pic Mr. Cobra guy?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", tool boxes, etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

Rinke
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Re: Exhaust donut burnout

Post #8 by Rinke » Thu Jul 20, 2017 5:17 pm

Hi.

I had this problem as well, burning through these rings.
The pipe to block brace was not properly attached, allowing the pipe to "wiggle" itself free.
You need this brace, that attaches to a threaded hole I believe just below the freeze plugs on the PS of the engine.
You attach the pipe to the bracket with a simple exhaust clamp.

http://www.cjponyparts.com/6-cyl-head-p ... /p/HW1409/

Good luck
Rinke
64 Falcon Station Deluxe
3 on the tree
170
3.50:1 rear end
Been collecting dust & adding rust for 30 years
Goal: to keep it all working from okt 2008 till all eternity

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