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Slipper clutch date's

in 912 / 914 Technical Questions 11 years ago
Hello Rotax Family members.......

When did Rotax start installing the slipper clutches with the new motors.....
I have serial# 4428472

Thanks.......
Warren
kitfox7
Maui,Hawaii

  • Re: Slipper clutch date's

    by » 11 years ago

    The overload clutch was first introduced on the certified engines back in 1989. They are standard on all certified engine to this day (certification requirement: the multi-piece crank must have overload protection)
    They are considered as "standard" for the 912ULS 100hp since approx 2001 (for the North American market anyways)
    Your engine is a 2002 sold by the USA distributor so it likely has the clutch. It is easy to test; Can the tip of the prop be moved approx 8" with a strong guy holding the flywheel bolt with a wrench? Yes? you have a clutch.
    For the 912UL 80hp the clutch is still an option.
      
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  • Re: Slipper clutch date's

    by » 11 years ago

    My rotax was built in 2002 with the serial number of 4427978. I'm doing a condition inspection and I put the stop bolt in and tried to slip the clutch, at 42.5 lbs i stop pulling because I thought I was going to break something. I had this box rebuilt 210 hours ago from lockwood, what do you guys think.

    does my engine have a clutch?
      
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  • Re: Slipper clutch date's

    by » 11 years ago

    It doesn't sound like your gearbox has a clutch.
    If it has a clutch it will start to move around 11-12 ft/lbs if you are pulling from 28-30 in. out from the center of the prop hub and should be somewhere around 420-490 in/lbs for a normal range for the final results.

    inches from the prop hub center x ft/lbs (from the scale) = in/ lb (or Nm) final reading

    i.e.
    28 inches X 17 ft/lbs = 476 in/lbs (or 53.7 Nm)

    Hi Rob,

    I think the clutches were standard in the US in 2003 from Kodiak if I remember what Eric told me.


    p.s.

    Whatever you do do not bend that crank lock pin inside the case. If you do you will have to split the case to remove it.

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

      
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  • Re: Slipper clutch date's

    by » 11 years ago

    My 100HP 912ULS Serial Number 4427595 does not have a slipper clutch. I do not know the date of manufacture.

    Ron Greene
      
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  • Re: Slipper clutch date's

    by » 11 years ago

    Up to about 2003 they were optional in the ULS in the US. Then they all stated to come with them. If yours doesn't have one you can still install it.

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

      
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