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07-13-2019, 07:04 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Pushrods on our engines are thin-walled to fail exactly as in this case. I would hammer the valve out of the guide with a brass drift and clean the guide with a ball hone. I do not like and do not use reamers for guides since the guides wear oblong on opposite ends imprecisely due to rocker geometry. A reamer will not clean the entire guide properly because of the wear so you're left with the possibility of sticking the valve again. FWIW I have never had any issues with any valve guide sticking again using a ball hone. Its very easy to reinsert the valve into the guide via the spark plug hole using a mechanical pickup tool and some soft rope.
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Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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07-14-2019, 06:21 AM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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don't forget to do a wobble test and check the rest of the valves. 
__________________
TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
addicted pickle ball player
https://i.postimg.cc/tn3h4svg/IMG-3101.jpg
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07-14-2019, 05:28 PM
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Join Date: Jul 2005
Location: Bolingbrook, Illiniois
Posts: 254
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where to find the right ball hone
Quote:
Originally Posted by rocketbob
Pushrods on our engines are thin-walled to fail exactly as in this case. I would hammer the valve out of the guide with a brass drift and clean the guide with a ball hone. I do not like and do not use reamers for guides since the guides wear oblong on opposite ends imprecisely due to rocker geometry. A reamer will not clean the entire guide properly because of the wear so you're left with the possibility of sticking the valve again. FWIW I have never had any issues with any valve guide sticking again using a ball hone. Its very easy to reinsert the valve into the guide via the spark plug hole using a mechanical pickup tool and some soft rope.
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Hi Rocket Bob, where did you find the right size for the valve guide? Do you remember which one you use?
Thanks,
Paul
__________________
Paul
N694BP reserved
RV-6A Very Slow Build!
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07-14-2019, 08:40 PM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
Last edited by rocketbob : 07-14-2019 at 08:49 PM.
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07-15-2019, 05:53 AM
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Join Date: Oct 2010
Location: Elkton, Md.
Posts: 1,652
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Thanks Rocket. That?s a must have. I had one one time that broke the push rod tube into two pieces. Apparently, it stuck, bent the push rod, broke the tube and unstuck itself! Just unbelievable.
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Wag Aero Sport Trainer built,sold and wrecked
N588DF RV12 #336 built, sold and alive and well in New York
N73DF RV12 #244 built, sold and alive and well in Florida
N91 RV RV9 I wish I could say I built this one! Mark Santoleri hit the ball out of the park on this gem.
Currently restoring a 1978 Citabria GCBC
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07-15-2019, 08:02 AM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,145
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With the hone, how do you go about clearing the cylinder of any remaining abrasive grit before closing it up? Just blowing air through the spark plug holes?
I'm not sure I have a warm-fuzzy feeling with that, over using a reamer slathered with grease to catch cuttings. The reamer will not release abrasive particles.
__________________
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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07-15-2019, 09:47 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by airguy
With the hone, how do you go about clearing the cylinder of any remaining abrasive grit before closing it up? Just blowing air through the spark plug holes?
I'm not sure I have a warm-fuzzy feeling with that, over using a reamer slathered with grease to catch cuttings. The reamer will not release abrasive particles.
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Brush research hones are not like stone hones. They don't release any abrasives in the honing process. The only thing released is the carbon junk, just like a hone.
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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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07-15-2019, 09:52 AM
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Join Date: Nov 2013
Location: Mid Michigan
Posts: 17
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Guide Damage from Driving Valve Out
Be sure to file the raised ridge/burr left by the valve keepers before driving the valve from the guide. Not do so will, more than likely, damage the valve guide.
Are there oil control seals on the valve guides on these engines?
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07-15-2019, 10:22 AM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,297
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Quote:
Originally Posted by Warden
Be sure to file the raised ridge/burr left by the valve keepers before driving the valve from the guide. Not do so will, more than likely, damage the valve guide.
Are there oil control seals on the valve guides on these engines?
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No. They have anemic oil flow to the rocker box, so no need for oil seals.
__________________
N64LR - RV-6A / IO-320, Flying as of 8/2015
N11LR - RV-10, Flying as of 12/2019
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07-15-2019, 11:24 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Quote:
Originally Posted by airguy
With the hone, how do you go about clearing the cylinder of any remaining abrasive grit before closing it up? Just blowing air through the spark plug holes?
I'm not sure I have a warm-fuzzy feeling with that, over using a reamer slathered with grease to catch cuttings. The reamer will not release abrasive particles.
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I push the oiled ball hone in very slowly with the drill, take 2-3 strokes, and pull it out. Most of the trash comes out the guide at the rocker end or falls into the exhaust. On the intake side I pull the intake tube and let it fall out and its a minuscule amount.
__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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