Small Engine/Carburetor Cleaner - RC Groups
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Mar 30, 2012, 10:12 PM
Registered User
PyroMan's Avatar

Small Engine/Carburetor Cleaner

Hello everyone,
I don't do much with gas powered planes or engines so I don't know too much about them. The other day and older gentleman gave me an old Testors McCoy .049 engine. It is all gummed up and I can only move the shaft a few degrees and that alone is hard to do. I would like just to fool around with it in my free time and maybe one of these days get it running.

To get all the gunk out of it I think I will soak it in some carb cleaner solution. My only reservation is if there is something in the engine that the carb cleaner could destroy. Is there anything in this engine I need to worry about? Like gaskets or possibly plastic?

I have taken a back plug off the engine to where I can see where the piston connects to the shaft, and I have taken off the glo plug off top so I can see the top of the piston. I did this so the carb cleaner can get inside the engine itself.

So would this be a good thing to do?

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Mar 30, 2012, 11:12 PM
Transplant in 1996
I just soak in my crockpot with antifreeze. It takes about 2 days, but everything I have done this way has come out great. I put my .49 lot of engines in first to test, was able to get all but 1 to run.
Mar 31, 2012, 09:15 AM
Registered User
That along with the heat helps loosen everything up. I do this when I replace bearing, or loosen stuck wristpins. Need to rinse good afterwards and oil.
Mar 31, 2012, 10:22 AM
Master of the Figure "9"
hogflyer's Avatar
Put some raw glow fuel in it, let it sit for a while and see if that won't start to dissolve all the gunk. You can do this from the venturi, the back plate, and on the top of the piston. When things free up, then pull it apart and finish cleaning it.

Another option would be to put it in a small container submerged in glow fuel and let it soak for a while. That should also work to free it up to the point you can disassemble it.

An engine that small generally won't need to be cleaned in a crock pot unless its really coated with varnish.

Mar 31, 2012, 10:13 PM
Registered User
tacx's Avatar
you will be suprised what a heat gun can do with an old gummed up engine.
Mar 31, 2012, 11:46 PM
Registered User
PyroMan's Avatar
So I let the engine sit in carb cleaner for six hours. It looks a lot better and I can now spin the shaft 360 degrees. It's fairly easy to spin, I don't know if it could be easier though. I would like to break the engine down into all of it's parts and go from there with the cleaning process.

I now have the glo plug off and I have the back piece off what else can I take off or do to dismantle it further.

Thanks for all the advice so far,
Apr 08, 2012, 07:50 AM
Will fly for food
Heat with heat gun or hair dryer to get it moving. Then use fuel or solvent followed by oil to clean out the heat softened gunk.

Crock pot with antifreeze is very good for a thorough cleaning but remove ALL plastic parts as you can destroy them.
May 06, 2012, 02:39 PM
Registered User
PyroMan's Avatar
Here's how I went about cleaning the engine -

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