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  1. #1

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    How to disassemble O.S. 140 RX

    Hi there,

    When disassembling the O.S. 140 RX for cleaning/bearing exchange I am having problems to remove the connecting rod. Even after pulling the cylinder sleeve and setting the piston in top dead center there is not enough play to slip the rod from its lower bearing at the crank pin. It gets stuck half way even if I try to work the rod on the piston pin towards the same side. Thank you for any suggestions.

    Best regards

    Winrich

  2. #2
    Moderator
    Join Date
    Apr 2002
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    Champaign, IL
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    RE: How to disassemble O.S. 140 RX

    You have to use something as a lever to force the rod off of the crankpin. The only other way would be to try to remove the spring retainer on the piston pin through the exhaust port, but it's very difficult because there is little room to work.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com

  3. #3

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    RE: How to disassemble O.S. 140 RX

    Hi Bax,

    thank you for your reply. I am just hesitant to use much force because I am afraid to distort the bearing bushing - or is that less sensitive than I thought?

    Best regards

    Winrich

  4. #4

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    RE: How to disassemble O.S. 140 RX

    Hi Bax,

    I got it out now. A dentist mirror brought it to light. The problem was, that the piston pin was seized in the upper rod bearing and all what the rod did was to rotate the pin in the piston bore holes. After soaking with WD40 I could work the rod along the pin a bit to the side, enough to finally get the rod also off the crank pin.

    Best regards

    Winrich


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