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I found two threads on this topic but neither really answered my question.  I am wondering if my 912ULS has a clutch to see if I need to measure the friction torque in my 100hr inspection.  I have used the engine configuration search with SN 6785083 and found this:

Engine Type: ROTAX 912 ULS
Engine Version: 912 ULS2-01
Model Number: 309120110

Configuration:
    with fuel lines
    UL2 I=2,43 with clutch
    without vacuum pump
    with green valve covers
    without mech. tachom. pick up
    without external generator
    without air guide baffle
    with std. temperatur sensors
    with screw connection UNF
    with expansion tank
    without air box
    without engine truss
    starter large

 

So does that mean I have the clutch or not?  :) Not quite sure how to interpret "UL2 I=2,43 with clutch".  Normally I would just do what you suggest in your frictional torque video and put in the crankshaft locking pin, turn the prop, and see if it moves 30 degrees but I am having trouble finding the 240-880 locking pin as neither CPS-parts nor aircraft spruce seems to carry it.

 

Thanks!

Scooby

  • Re: Does my 912ULS have a clutch? (configuration search intrepretation)

    by » 5 months ago


    hey Scooby

    Yes it had a clutch in the gearbox when it left the factory.  You can check that as you noted by locking the crank and looking for hte freeplay on the prop to crank.  I would contact a current iSC for the lockpin tool, CPS (Spruce) are no longer part of the Rotax network.  Try Lockwood, LEAF or the new west coast guys Motive.  You can find the listings and contact here www.RotaxiRMT.com and select iSC to isolate the one nearest you.  if you are not in the USA contact your distributor in your region.  

     

    Cheers


    Thank you said by: RotaxOwner Admin

  • Re: Does my 912ULS have a clutch? (configuration search intrepretation)

    by » 5 months ago


    Rotax Wizard wrote:

    hey Scooby

    Yes it had a clutch in the gearbox when it left the factory.  You can check that as you noted by locking the crank and looking for hte freeplay on the prop to crank.  I would contact a current iSC for the lockpin tool, CPS (Spruce) are no longer part of the Rotax network.  Try Lockwood, LEAF or the new west coast guys Motive.  You can find the listings and contact here www.RotaxiRMT.com and select iSC to isolate the one nearest you.  if you are not in the USA contact your distributor in your region.  

    Cheers

    Thank you!

    Glad I have the clutch.

    No wonder AircraftSpruce didnt have a lot of the parts I needed, LEAF has them all in stock :)  By the way, ALL your videos are awesome.  

     

    Scooby


  • Re: Does my 912ULS have a clutch? (configuration search intrepretation)

    by » 5 months ago


    Meaning of UL2 I=2,43 with clutch

    UL2
    Option #2 = Propeller Shaft with flange for fixed-pitch propeller, P.C.D. 75 mm, P.C.D. 80 mm and P.C.D. 4 inches
    If the Prop shaft was drilled for a Hydraulic Constant Speed Prop, That would have been Option #3.
    P.C.D. = Pitch Circle Diameter. A.K.A. "Bolt Circle".

    I=2,43   = 2.43:1 Reduction Gear Box. (51:21 Gears)
    They use the comma for the Decimal Point in Europe.
    The Other Option would have been  2.27:1 (50:22 Gears) More common on the 80hp  912UL Engines. 

    With Clutch
    Obviously Means it has the Clutch installed.
    - - -

    There is nothing overly special about the Locking Tool.
    Any M8 Bolt with a dull point machined on the end will serve just as well.
    The head can be whatever you have on hand and 50mm of length is plenty too long.

    31599_2_CrankLockingBolt.jpg (You do not have access to download this file.)

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: RotaxOwner Admin

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