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09-17-2019, 11:05 AM
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Join Date: Aug 2019
Location: Appleton, WI
Posts: 184
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Is this an Exhaust Leak?
O-320-A1A EXHAUST PICTURE
Referencing linked picture above...What say ye concerning the rust color on the head near the exhaust flange and around the plug well?
It looks to me like a exhaust leak but isn't the typical white color. The other thing I notice is the flange studs...doesn't look like those nuts have come off in awhile which means the exhaust hasn't been removed for inspection.
Last edited by avrojockey : 09-17-2019 at 11:25 AM.
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09-17-2019, 11:32 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,120
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Possible crack in the head between the exhaust port and spark plug hole?
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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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09-17-2019, 12:43 PM
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Join Date: Apr 2011
Location: SF East Bay
Posts: 852
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Easy enough to test. Pull the plug and do a compression check.
If it is a leak/crack it will show itself instantly.
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Sam
RV-8 with the Showplanes Fastback conversion
Emp completed except for glass work
Wings completed except for bottom skin and glass work
Fuselage underway
N18451 reserved
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09-17-2019, 12:47 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,277
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Typical signs of exhaust leak are a matte, dark black staining/coating. Rust is something different.
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N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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09-17-2019, 05:45 PM
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Join Date: Jul 2005
Posts: 1,341
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What is above the cylinder in that area?
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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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09-17-2019, 07:40 PM
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Join Date: Jul 2014
Location: Teton Valley, ID / Jackson Hole, WY
Posts: 49
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Quote:
Originally Posted by xblueh2o
Easy enough to test. Pull the plug and do a compression check.
If it is a leak/crack it will show itself instantly.
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Not necessarily true. If the crack is between the exhaust valve and the exhaust manifold, a compression check will not reveal a crack/leak in that area. We found that this past week on our #2 cylinder on our Warrior. It compression tested at 76lbs, but a cracked cylinder in the exhaust port was found. |
09-18-2019, 06:41 AM
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Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 329
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Quote:
Originally Posted by lr172
Typical signs of exhaust leak are a matte, dark black staining/coating. Rust is something different.
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Every exhaust leak I've seen showed as a white or light tan coating. If it's black you are too rich at idle.
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Mike Hilger
RV-6 N207AM w/G3X, 1,600 hours +
South St. Paul, MN (KSGS)
A&P, EAA Tech Counselor
We're all here because we're not all there...
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09-18-2019, 09:09 AM
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Join Date: Aug 2019
Location: Appleton, WI
Posts: 184
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Quote:
Originally Posted by fl-mike
What is above the cylinder in that area?
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There's nothing mounted on or above the head that would be causing the discoloration. |
09-18-2019, 09:23 AM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,092
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The source of those rust-colored deposits has to be steel, so that pretty much narrows down the source. If it were my plane, I would suspect that exhaust gasket first. Good luck breaking that exhaust nut free 
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(2020 dues paid)
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09-18-2019, 10:39 AM
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Join Date: Jul 2005
Posts: 1,341
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Quote:
Originally Posted by avrojockey
There's nothing mounted on or above the head that would be causing the discoloration.
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what color is your baffle material?
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
N164WM
N184WM reserved (RV-8)....finishing kit in progress. Titan IOX-370
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