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  #11  
Old 07-13-2019, 07:04 AM
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rocketbob rocketbob is offline
 
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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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  #12  
Old 07-14-2019, 06:21 AM
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don't forget to do a wobble test and check the rest of the valves.
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  #13  
Old 07-14-2019, 05:28 PM
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pczar3 pczar3 is offline
 
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Default where to find the right ball hone

Quote:
Originally Posted by rocketbob View Post
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.
Hi Rocket Bob, where did you find the right size for the valve guide? Do you remember which one you use?
Thanks,
Paul
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  #14  
Old 07-14-2019, 08:40 PM
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https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

https://www.amazon.com/dp/B002XUL0AO/ref=biss_dp_t_asn
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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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  #15  
Old 07-15-2019, 05:53 AM
Dave12 Dave12 is online now
 
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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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  #16  
Old 07-15-2019, 08:02 AM
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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.
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  #17  
Old 07-15-2019, 09:47 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by airguy View Post
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.
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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  #18  
Old 07-15-2019, 09:52 AM
Warden Warden is offline
 
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Location: Mid Michigan
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Default 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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  #19  
Old 07-15-2019, 10:22 AM
lr172 lr172 is offline
 
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Quote:
Originally Posted by Warden View Post
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?
No. They have anemic oil flow to the rocker box, so no need for oil seals.
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  #20  
Old 07-15-2019, 11:24 AM
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rocketbob rocketbob is offline
 
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Quote:
Originally Posted by airguy View Post
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.
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.
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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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