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Cox .049 issue

Old 12-14-2009, 02:24 AM
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jsesere
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Default Cox .049 issue

OK who has a sure fire method for getting a castor oil stuck piston free without damaging the anodizing or the cylinder?
Also info needed on how to remove the cylinder if there are no flat spots on the top of cylinder to use a Cox tool on?
Old 12-14-2009, 02:54 AM
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combatpigg
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Default RE: Cox .049 issue

Heat......and you could make a little strap wrench to break the cylinder loose. Hoppes gun solvent will penetrate gummed castor quickly.
Never stick a tool into the exhaust ports, the pilings of the Grand Coulee Dam are formed with all the Cox cylinders that were ruined that way..

Actually, I've always used a plain old pair of round jawed pliers to undo and retighten the cylinders.
Old 12-14-2009, 03:02 AM
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longdan
 
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Default RE: Cox .049 issue

There is no anodising on a cox piston. Its a steel cylinder with an iron piston. But as CP said - heat it. It will soften the gummed up castor. The boiling in antifreeze method works wonders for clearing away every last trace of castor residue, but the surfaces have to be exposed.
Old 12-14-2009, 03:42 AM
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jsesere
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Default RE: Cox .049 issue

My concerns about the anodizing were the gold and black finish on Golden Bee's and Black Widows. I have tried the round jaw pliers on an old junk cylinder but it scratched the fins. Will Hope's penetrate between the piston and the inside wall of the cylinder? I have a toaster over I can cook it in. How much heat and for how long without causing damage? Any ideas on making a strap wrench? I thought a piece of belt leather in a pair of pliers might work. My engines are mint except for the locked up pistons.
Thank you





Old 12-14-2009, 03:59 AM
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longdan
 
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Default RE: Cox .049 issue

as long as you have removed all plastic parts and gaskets (ie: only the cylinder and piston/rod in the oven) then you should be good for 200-300 F. You could probably go more, but its unnecessary. Castor will go soft in boiling water at 212F. But just because the castor is soft, doesn't mean the piston will give up without a fight. But it helps.
Old 12-14-2009, 06:48 AM
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Tim Wiltse-RCU
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Default RE: Cox .049 issue

Get a small pan with a couple cups of water and heat it up on the stove. Add a couple three drops of liquid dish washer soap(not regular dish soap). Start it out on low heat and stick your parts in for a few minutes. Turn up the heat alittle and then check your parts. Put a prop on the engine and work it free. Don't worry you won't hurt anything. It shouldn't take any time at all.

LAter,
Tim
Old 12-14-2009, 09:55 AM
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Tom Nied
 
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Default RE: Cox .049 issue

Have you tried fuel and some persuasiveness? Has always worked for me
Old 12-14-2009, 04:01 PM
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Default RE: Cox .049 issue

fuel has always worked for me too...Rog
its like cleaning oil up with gas
Old 12-14-2009, 05:04 PM
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jsesere
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Default RE: Cox .049 issue

Tim, you da man. Hoo hoo
The hot water method rocks da house. Thanks to all for their input.








Take offs are optional, landings are mandatory
Old 12-14-2009, 05:28 PM
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Tim Wiltse-RCU
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Default RE: Cox .049 issue

Glad to hear you got her all loosened up.

Tom and Rog.....yup good ol fuel does the trick too...

.......cleanig up oil with gas ....that's a good one Rog...so true!!!

Later,
Tim

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