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  1. #1
    RickP's Avatar
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    Old .020 Cox motor won't turn

    Hey Gang,
    I resurected an old Cox Pits control line biplane I had when I was a child. I noticed that the motor no longer turns, I assume it is all gummed up with castor oil (I hope). What is the process for cleaning these things up? I've heard something about boiling them?
    much thanks in advance.
    Rick

  2. #2
    Max_Power's Avatar
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    RE: Old .020 Cox motor won't turn

    usually a few drops of 3-1 oil or ATF at the exhaust ports and a light warming with a hair dryer while easily trying to turn the prop will free it up before it gets too hot to hold. Todd
    \"A guy told me the other day I must be very smart,......I told him \"No!, I\'\'m REALLY dumb, But learning from my mistakes!!\"\"

  3. #3

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    RE: Old .020 Cox motor won't turn

    If it's not siezed due to rust and is indeed gummed up with castor... fill a pie plate with model fuel and drop the engine in for a few hours...preferably room temp. Remove the glow plug and backplate/tank first, if possible.

    Then work it loose with further soaking if required

    Don
    Revver Brother #94

  4. #4
    RickP's Avatar
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    RE: Old .020 Cox motor won't turn


    ORIGINAL: Max_Power

    usually a few drops of 3-1 oil or ATF at the exhaust ports and a light warming with a hair dryer while easily trying to turn the prop will free it up before it gets too hot to hold. Todd
    Worked like a charm! Sounds like it will fire right up. Glow plug works too!

    Like I need another project... I would like to clean up the plastic a little better, any thoughts? It's a little fuel soaked.

    I found a new gear set on Ebay with wheels. I figure what the heck, why not get it in flight ready status? quickie little project....
    Rick
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  5. #5

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    RE: Old .020 Cox motor won't turn

    Rick, Remember the Pee Wee .020 has a reed valve in it. It too could be stuck shut. If you
    arn't comfortable disassembling the engine, continue to give it a good soaking in fuel.
    A lot of times you can hear the reed valve "pop" on it's seat when you flip the engine
    backwards, and forwards. This is a good sign that the reed is free. Good luck, Greg

  6. #6
    RickP's Avatar
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    RE: Old .020 Cox motor won't turn

    Thanks Greg,
    It was sucking oil in through the intake screen at the appropriate times. I think the reed is fine, but the gaskets are shot, I need to find a rebuild kit on line somewhere. The small black O-ring and tank to crankcase gasket are shot. Any idea where I can find parts? Was going to check on Ebay.
    Rick

  7. #7

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    RE: Old .020 Cox motor won't turn


  8. #8

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    RE: Old .020 Cox motor won't turn

    Or, EX Model Engines
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    the "other" andrew
    I'm not older than dirt, but I can remember when it was patent pending

  9. #9
    RickP's Avatar
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    RE: Old .020 Cox motor won't turn

    Thats it, Thanks guys!


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