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01-03-2013, 08:50 AM
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Join Date: Jan 2005
Location: Park Ridge, IL
Posts: 369
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Ouch
About all I can say.... Ouch!!
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Jim Pappas VAF #13
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01-03-2013, 09:00 AM
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Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,156
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Quote:
Originally Posted by turbo
scott, do you have any info on the borescope you are planning on getting. cost, contact? thanks 
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Sure. I just ordered the first piece of junk off of Amazon that I found. We'll see if it works out with modifications. If not, my plan B is the ATS Borescope, which I may very well get anyway.
Amazon: "Sewell USB IntraOral Oral Dental Camera, 2 MegaPixel, 4 LED"
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Scott Card
CQ Headset by Card Machine Works
CMW E-Lift
RV-9A N4822C flying 2200+hrs. / Cedar Park, TX
RV8 Building - fuselage / showplanes canopy (Done!)
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01-03-2013, 09:04 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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While we're on the subject of diagnosing things, can someone provide a link to an engine idiot on HOW to conduct a compression test that might uncover these sorts of things. and thanks!
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01-03-2013, 09:15 AM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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S'cuse me , Bob, but ...
did you want a link TO and engine idiot, or a link FOR an engine idiot? 
(sorry, couldn't resist.)
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Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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01-03-2013, 09:20 AM
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VAF Moderator
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Join Date: Jan 2005
Location: Pine Junction, CO
Posts: 655
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Quote:
Originally Posted by LettersFromFlyoverCountry
While we're on the subject of diagnosing things, can someone provide a link to an engine idiot on HOW to conduct a compression test that might uncover these sorts of things. and thanks!
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http://v2.ez.org/cp63-p7.htm
The above link is one of many if you search the internet. Have someone who knows how to perform the DC test walk you through the first time.
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Gary "Seismo" Zilik
Pine Junction, Colorado
RV-6A N99PZ S/N 22993 SOLD
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01-03-2013, 09:26 AM
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Join Date: Jun 2005
Posts: 693
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Well Scott, if you replace the e-bus diode, polish the fetzer valve, and reverse the master switch polarity this should not happen again! 
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
Thinking about low and slow backcountry build.
VAF Advertiser - Aircraft Wiring Guide
Book to help with experimental aircraft wiring.
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01-03-2013, 10:52 AM
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Join Date: Aug 2012
Location: Newberg, OR
Posts: 18
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Burnt valve
Scott,
Lycoming exhaust valves have rotator caps that sit on top of valve stem and allow the valve to turn each time it opens. The one darker spot on that valve indicates a place where the valve was not transferring heat to the seat (should be a solid ring all the way around). I'm curious that the valve may have stopped rotating due to build up of carbon in the guide; Lycoming has all sorts of bulletins about sticking valves and reaming guides.
Mike Busch did a webinar for EAA that has info related to exhaust valves and it's worth 45 minutes of your time. I think it was last spring sometime.
Post a picture of the rocker box area around the spring seat so we can see if there is evidence of high heat around the guide.
Keep 'em flying.
Grub
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01-03-2013, 11:44 AM
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Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,069
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so, is the valve replaced or the entire cylinder?
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Ryan Allen, CFII
RV7 N612RA, flying since july 2012
E-170/175
RV10 Tail Kit complete, Wings 90%, fuse on order
Acro Sport 2, building
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01-03-2013, 12:08 PM
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Forum Peruser
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Join Date: Jan 2005
Location: Austinville, Alabama
Posts: 2,458
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Quote:
Originally Posted by scard
... That point came this past weekend when Tanya wanted to go do a dog rescue for pilots-n-paws and I said "Sorry, you can't go", as I held my head in shame...
... Feel sorry for Tanya, she has to write the checks  .
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Scott, I think the least you could have done for her was to rent a Cessna or Piper for her to complete the PnP mission! 
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Don Hull
RV-7 Wings
KDCU Pryor Field
Pilots'n Paws Pilot
N79599/ADS-B In and Out...and I like it!
?Certainly, travel is more than the seeing of sights;
it is a change that goes on, deep and permanent, in the ideas of living." Miriam Beard
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01-03-2013, 12:26 PM
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Join Date: Aug 2012
Location: Newberg, OR
Posts: 18
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Valve replacement
Ryan,
I think the exhaust valve would be replaced because at 500+ hours the chrome flashing has worn off the valve stem and I suspect has some abrasion from carbon built up inside the valve guide. Guide could be reamed and then dimensionally inspected; if worn it would be replaced. Valve seat should be fine as long it is ground/cut so the new valve has a proper seating surface.
Lycoming's transfer most of their heat through the valve stem as opposed to the seat like a Continental does. Lyc SI 1200A details the need for a very smooth surface finish on the guide so you have good stem-to-guide contact to enable heat transfer.
No need to replace the cylinder, just tidy it up as above.
Grub
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