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912UL Engine vibration on throttle back

in 912 / 914 Technical Questions 12 years ago

  • Re: 912UL Engine vibration on throttle back

    by » 11 years ago

    Hi Roger

    I hope it keeps going :-)

    I will be happy with 4000 hrs.

    As a point of interest, do you change the plastic washer and ring halves when doing a service, or do you go on condition.

    Also, when pressing the gearbox, how many tons do you press as a maximum.

    Mark
      
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  • Re: 912UL Engine vibration on throttle back

    by » 11 years ago

    Hi Mark,

    No reason your engine should see your 4000 hrs.

    I always change the plastic washer and depending on which inspection the split ring too, but not every time I pull the box. I'm sure Rotax would like it done every time. Kind of like replacing Nylock nuts with a new one every time. CYA

    I don't measure the exact tons of pressure, I can usually feel when I bottom out. I'm not a heavy handed type and I try to make my split rings a tight insertion. Most of my gearbox re-shims come out to be right around 475-490 in/lbs.

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

      
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  • Re: 912UL Engine vibration on throttle back

    by » 11 years ago

    Is there any way to determine if the gearbox is worn before removing it? Mine does not have a slipper clutch. Can I put the crank locking pin in place and then measure the rotational play at the prop?
      
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  • Re: 912UL Engine vibration on throttle back

    by » 11 years ago

    Hi Kevin

    Unfortunately not. You will have to remove and strip the gearbox to inspect the prop shaft spline condition.

    I would suggest doing it from a piece of mind point of view, if it is worn, the more it is worn, the quicker it will wear if you understand what i mean.

    Mark
      
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  • Re: 912UL Engine vibration on throttle back

    by » 11 years ago

    Bad news folks :(

    I removed the gearbox and sent it away for inspection and unfortunately the prop shaft splines are worn. I know that I have no choice but to have it rebuilt but I have been offered the choice of rebuilding it as it was or fitting a slipper clutch.

    The cost of either option is truly eye-watering, it is over £1k or £1k5 for the slipper clutch option.

    It has been suggested that the slipper clutch will make the engine idle smoother and will help to reduce the wear on the gearbox.

    I am open to suggestions/advice on which option to choose. My engine is a 912UL (80HP).

    Thanks,

    Kevin
      
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