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  #11  
Old 09-18-2023, 12:16 PM
moespeeds moespeeds is offline
 
Join Date: Apr 2021
Location: Cherry Hill, NJ
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Push it back on, torque just the big nuts, and rotate the engine with lots of lube sprayed into the bore. Get it all loosened up and try again with the cyl at TDC.

Mine was also a pia to get off, turns out the rings were delaminated and packed with flaked moly. Made everything sticky.

I wouldn't go nuts rotating the engine with no torque on the through bolts.
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  #12  
Old 09-18-2023, 12:20 PM
abuura abuura is offline
 
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Quote:
Originally Posted by rmarshall234 View Post
With the valves closed and bottom plug in, apply shop pressure to other spark plug hole? Just spitballing hereÖ
Thatís a good thought. Iíll try it. With piston at bottom center (prop wonít turn) Iíll start with 20psi on the differential side and work my way up carefully.
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  #13  
Old 09-18-2023, 12:20 PM
gasman gasman is online now
 
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Quote:
Originally Posted by RheinRivets View Post
If the air pressure gets high enough, the suddenly loosening cylinder might turn into a nice projectile. Might work but I would proceed with extreme caution.
If you were to go in this direction, it would work if the piston was at the bottom of the stroke and use hydraulic pressure = no projectile... full control.

I think the penetrating oil should work for you.
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  #14  
Old 09-18-2023, 12:22 PM
abuura abuura is offline
 
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Quote:
Originally Posted by gasman View Post
If you were to go in this direction, it would work if the piston was at the bottom of the stroke and use hydraulic pressure = no projectile... full control.

I think the penetrating oil should work for you.
Iím hoping it does. Lycoming support says using the thick end of a wood shim to rock against would be acceptable too.
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  #15  
Old 09-18-2023, 12:35 PM
gasman gasman is online now
 
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Quote:
Originally Posted by abuura View Post
Thatís a good thought. Iíll try it. With piston at bottom center (prop wonít turn) Iíll start with 20psi on the differential side and work my way up carefully.
Be careful here... 20 psi will apply over 400 pounds force.

If you are going to use air, start at O and work your way up to 5 psi.

If that doesn't work, then go hydraulic.
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  #16  
Old 09-18-2023, 02:48 PM
abuura abuura is offline
 
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Quote:
Originally Posted by gasman View Post
Be careful here... 20 psi will apply over 400 pounds force.

If you are going to use air, start at O and work your way up to 5 psi.

If that doesn't work, then go hydraulic.
Sage advice. Wilco.
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  #17  
Old 09-18-2023, 04:46 PM
Taltruda Taltruda is offline
 
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Go and climb into the cockpit and yell “clear prop” and start the engine.. it’ll come off..it might sound like Dreadnaught for a few seconds..
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  #18  
Old 09-18-2023, 05:18 PM
PilotjohnS PilotjohnS is offline
 
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Default fluid, not air

if you are going to try air pressure, I would fill the cylinder with fluid, like alcohol or something, to minimize the volume of air, and the resulting pop.

But remember, you are going to be applying force to something that is hanging up, like coked deposits or something, so that force is going to be exerted on something that hopefully, will be able to take it.
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  #19  
Old 09-18-2023, 06:21 PM
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climberrn climberrn is offline
 
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Heard a funny story recently. Difficult, rusted cylinders on a radial. They would fill the cylinder with Oxygen/Acetylene and light it. Would get it right off, and occasionally hit the ceiling.

Please don't try this. Just thought you would get a laugh out of it.
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  #20  
Old 09-18-2023, 09:19 PM
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wcalvert wcalvert is offline
 
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Huh Huh ... Fire Fire Fire
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