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Post  rsv1cox Sun Apr 24, 2016 1:25 pm

Flea market find. Seller wanted $15 for the Cox, tossed in the needle less OS .20 for five bucks more.... $15 for the .15, $20 for the .20 sorta of a co inky dink. Smile I need a nap. Smile

Medallion R/C .15 and friend Cox_1511

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Can you boil these Medallions in A/F? I'm afraid to try. Once I left a plastic R/C throttle control on an OS and it wound up as a blob on the bottom of the pot. Sad
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Post  fit90 Sun Apr 24, 2016 2:31 pm

Sweet deal!
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Post  Marleysky Sun Apr 24, 2016 2:39 pm

Bob- I've never put a medallion in the antifreeze/crockpot. I do know they ( plastic carb bodies) tend to change color or turn whiteish
https://www.coxengineforum.com/t9484-carb-body-cleaning-plastic#120581
To disassemble before the AF boil,  try warming it in the oven or with a hair dryer to soften up the old baked on castor. If yore gonna run/fly it, clean it up with old fuel or rubbing alcohol. If you're making a display engine the replacement carb bodies aren't cheep, but they're not outrageously  expensive either.  Congrats on the flea market find!
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Post  rsv1cox Mon Apr 25, 2016 6:55 am

Thanks, It's pretty beat but I think it will clean up.

I'm just going to run it.  I have a couple of .15 sized models that are just begging for power.  I think I have a couple of .15 sized wrenches left over from previous engines.  Gonna need the spanner to remove the prop drive assembly.  

The strap-on module is huge, to bad I don't have anything to use it on.  It's cracked any way and a little out of plumb.  I love those little .20 sized OS's, it won't be difficult to find a use for it.  

Bob
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Post  rsv1cox Mon Apr 25, 2016 3:22 pm

I cleaned up the flea stuff this morning. Found a nice little Williams tank in the module.

Medallion R/C .15 and friend CampM%201%20005_zps7efdhvwk

Removed the needle on the .15, everything else is stuck solid.

Medallion R/C .15 and friend CampM%201%20004_zps32j4hamk

Throwing caution to the wind I dumped the whole thing in the pot. But I did not bring it to a boil, I cut it off when a little steam occurred. About three hours.

Medallion R/C .15 and friend CampM%201%20012_zps7h69ug57

Medallion R/C .15 and friend CampM%201%20015_zpsrpmqqcyg

I got the cylinder off but the back plate would not budge, had to apply the old heat wrench to remove it.

Medallion R/C .15 and friend CampM%201%20021_zpstozy7nz0

Then the throttle sleeve would not come off and the heat gun was no help. I put it back in the pot this time bringing it to a boil and it slid right off. Everything cleaned up with a little 0000 steel wool and a soft tooth brush on the plastic and aluminum parts.

Medallion R/C .15 and friend CampM%201%20023_zps34zz6vft

Got it back together and lookin’ good.

Medallion R/C .15 and friend MampC%20017_zpss9xvddqn

But......this is strange, the cylinder to case gasket expanded, or the engine shrunk. Now the gasket is to large to use, it hangs out over the edge and it’s metal....But there is tons of compression in this engine. Also I forgot to note how the piston came out. The COX print on the con rod faces out right?
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Post  Ken Cook Mon Apr 25, 2016 4:28 pm

Bob, I'm a fan of the piston pin vs the ball socket. Yes, the words face out on the con rod. In addition, the base gasket was probably used due to the piston coming too close to the landing of the glow plug. I have used head gaskets from different engines to jack the cylinder up if needed. Cox would suggest to cut a paper clip the same width of the landing and lay it across the cylinder. Turn the engine over and see if the piston pushes the paper clip wire up and off the landing. If so, shim the cylinder as needed. Neat engines, very loud in the control line version, they don't make a lot of power as some would claim. They're just a decent light little engine.
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Post  rsv1cox Mon Apr 25, 2016 5:42 pm

Thanks Ken, I will try that paper clip trick.

But I think I will tape that case gasket down to a piece of wood and use a dremel cutoff disc to cut out a small portion then pinch it with my fingers and screw on the cylinder. May work. I have no idea how it expanded, it seemed to fit correctly when I removed it.

BTW, the case pressure nipple was never drilled through and the glow plug is good. Smile

Bob
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Post  ian1954 Tue Apr 26, 2016 8:02 am

All the base gaskets I have for these protrude slightly and are not tight fits.

Looking at the "before" pictures I think that the gasket size was masked by the goo.

Another nice engine clean up.

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