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01-10-2016, 10:00 PM
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Join Date: Mar 2013
Location: El Dorado Hills, CA
Posts: 696
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Exhaust flange warp
I call it a warp but it almost looks as if it was heat distortion when welded.
I plan on draw filing it as much as I can. What is the best gasket that spans the full flange? It had the steel gasket with no leak o ring but it allowed the flange to pull down when torqued.
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Blain
R-22 sold.
RV-8 AW Cert 02-09-17
N82 Sierra Tango
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Dues gladly paid thru Nov. 2020(my reminder ).
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01-10-2016, 10:57 PM
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Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
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Torqued flanges is what usually cause this. The "spiratallic" gasket you had I believe is the most tolerant. This is really common. The flanges are fairly ductile. Find a good firm surface and a way to brace/hold it there with the flange down. Then use a blunt punch or a well blunted air chisel (you can use an intermediate block to avoid scars). That should knock it most of the way flat and then finish the face with your favorite tool. Draw file, stone, other file or a 3 inch fiber wheel if you're steady eddie.
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Actual repeat offender.
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01-11-2016, 07:14 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,122
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Quote:
Originally Posted by aerhed
Find a good firm surface and a way to brace/hold it there with the flange down. Then use a blunt punch or a well blunted air chisel (you can use an intermediate block to avoid scars).
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Rivet gun with flat face?
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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01-11-2016, 10:02 AM
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Join Date: Oct 2012
Location: New Ulm, Minnesota
Posts: 283
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Shaping the metal part
Warm it up with a torch and hammer it flat. For a very flat surface file the surface then sand it using a steel or aluminum block that keeps the sandpaper flat against the surface.
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Robin Mckee
New Ulm, MN 56073
RV3b N219BB
420 hours and counting
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01-11-2016, 08:05 PM
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Join Date: Mar 2013
Location: El Dorado Hills, CA
Posts: 696
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Gasket?
So what gasket should I go back with if I get it straight?
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Blain
R-22 sold.
RV-8 AW Cert 02-09-17
N82 Sierra Tango
Avatar courtesy of AircraftStickers.com!
Dues gladly paid thru Nov. 2020(my reminder).
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01-11-2016, 08:17 PM
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Join Date: Jul 2012
Location: Hot Springs SD
Posts: 90
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Give me a call
Hi Brian, the blo proof gasket will offer the best sealing for an uneven flange, but yours looks to be too warped to seal properly. The best solution is to file the face back flat, but I'm curious to know why it is warping like that because that is just something we don't see with a 1/4" flange. At any rate we are glad to re face the flange. Clint/ Vetterman Exhaust
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01-11-2016, 08:35 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,642
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A belt sander does a good job of truing up the surface.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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01-12-2016, 10:10 PM
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Join Date: Mar 2013
Location: El Dorado Hills, CA
Posts: 696
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PM me
Quote:
Originally Posted by Clint B
Hi Brian, the blo proof gasket will offer the best sealing for an uneven flange, but yours looks to be too warped to seal properly. The best solution is to file the face back flat, but I'm curious to know why it is warping like that because that is just something we don't see with a 1/4" flange. At any rate we are glad to re face the flange. Clint/ Vetterman Exhaust
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Thanks Clint. Hit me with a PM and I'll call you.
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Blain
R-22 sold.
RV-8 AW Cert 02-09-17
N82 Sierra Tango
Avatar courtesy of AircraftStickers.com!
Dues gladly paid thru Nov. 2020(my reminder).
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