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Hi,

How can I tell if my gearbox (I bought a used, but nice running when removed, 912UL) has a slipper clutch?

Thanks,

Gil

  • Re: How to tell if it's a slipper clutch

    by » 2 weeks ago


    Many 912UL's didn't  come with slipper clutches and depending how old the engine is may have a 15 degree vs 30 degree gear setup. What year is the engine? Some owners added clutches on UL's


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


  • Re: How to tell if it's a slipper clutch

    by » 2 weeks ago


    Hi Gil,

    If I remember correctly there is some bolt one can stick in a particular hole in the engine case to block the crankshaft. Do that and try to move the prop in normal operating direction. No movement, no slippery clutch. 


  • Re: How to tell if it's a slipper clutch

    by » 2 weeks ago


    Go to the current maintenance manual line, MML, section 12-20-00 find where locking of the crankshaft is shown.  With the crankshaft locking pin in place then you can go the the propeller and try to turn in in one direction and then the other.  If there is no movement other than gear lash you have no clutch.  If you can move it 30 degrees you have a clutch.  There were only a small number of gearboxes from the 1990s with a 15 degree so it is unlikely you would have one of those.  If you did I would change for the 30 personally. 

    Cheers


  • Re: How to tell if it's a slipper clutch

    by » 2 weeks ago


    It was new in 2017


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