VansAirForceForums  
Home > VansAirForceForums

-POSTING RULES
-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

  #1  
Old 09-17-2019, 12:05 PM
avrojockey's Avatar
avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
Posts: 423
Default 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 12:25 PM.
Reply With Quote
  #2  
Old 09-17-2019, 12:32 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,593
Default

Possible crack in the head between the exhaust port and spark plug hole?
__________________
Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
Reply With Quote
  #3  
Old 09-17-2019, 01:43 PM
xblueh2o xblueh2o is offline
 
Join Date: Apr 2011
Location: SF East Bay
Posts: 868
Default

Easy enough to test. Pull the plug and do a compression check.
If it is a leak/crack it will show itself instantly.
__________________
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
Reply With Quote
  #4  
Old 09-17-2019, 01:47 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 6,713
Default

Typical signs of exhaust leak are a matte, dark black staining/coating. Rust is something different.
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
Reply With Quote
  #5  
Old 09-17-2019, 06:45 PM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,606
Default

What is above the cylinder in that area?
__________________
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
N184P reserved (RV-8QB)
Reply With Quote
  #6  
Old 09-17-2019, 08:40 PM
Ash Ash is offline
 
Join Date: Jul 2014
Location: Teton Valley, ID / Jackson Hole, WY
Posts: 49
Default

Quote:
Originally Posted by xblueh2o View Post
Easy enough to test. Pull the plug and do a compression check.
If it is a leak/crack it will show itself instantly.

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.
Reply With Quote
  #7  
Old 09-18-2019, 07:41 AM
rvsxer rvsxer is offline
 
Join Date: May 2007
Location: Inver Grove Hgts, MN
Posts: 358
Default

Quote:
Originally Posted by lr172 View Post
Typical signs of exhaust leak are a matte, dark black staining/coating. Rust is something different.
Every exhaust leak I've seen showed as a white or light tan coating. If it's black you are too rich at idle.
__________________
Mike Hilger
RV-6 N207AM w/G3X, 1,800 hours +
South St. Paul, MN (KSGS)
A&P, EAA Tech Counselor

We're all here because we're not all there...
Reply With Quote
  #8  
Old 09-18-2019, 10:09 AM
avrojockey's Avatar
avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
Posts: 423
Default

Quote:
Originally Posted by fl-mike View Post
What is above the cylinder in that area?
There's nothing mounted on or above the head that would be causing the discoloration.
Reply With Quote
  #9  
Old 09-18-2019, 10:23 AM
snopercod's Avatar
snopercod snopercod is offline
 
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,122
Default

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
__________________
(2020 dues paid)
Reply With Quote
  #10  
Old 09-18-2019, 11:39 AM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 1,606
Default

Quote:
Originally Posted by avrojockey View Post
There's nothing mounted on or above the head that would be causing the discoloration.
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
N184P reserved (RV-8QB)
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 10:39 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.