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  • Re: Stud bolts turning in Crankcase

    by » 6 months ago


    You do not need to remove the gearbox. Maybe we are talking two different case studs. If it is just turning up on #1 there is another allen head bolt on the top left half of the case. Take a look while you turn the stud it mat be turning. You need to hold that one. You don't need any thread locker. Use the proper torque sequence listed in the SB's 


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-574-1080 Home (TRY HOME FIRST)
    520-349-7056 Cell

  • Re: Stud bolts turning in Crankcase

    by » 6 months ago


    I have checked the crankcase today at my workshop but unfortunately, 914crankcase is different from  912 UL.

    see the attached picture, the 914 studs are fixed.

    if you show the 912 UL crankcase downside, we can suggest easily the best solutions.🙋

    26897_2_crankcase upper.jpeg (You do not have access to download this file.)

  • Re: Stud bolts turning in Crankcase

    by » 6 months ago


    Hello Roger and all.

    Just to make things clear, because of language issues, I am sending a photo of the internet (not my engine). The stud on the top right and bottom right of this cylinder, are the problem. When I tried to thighten the rod with cylinder en head on, the bolts and rods were turning without thightening. The hex bolt in the crankcase is turning. Can this be the reason, or are the studs just stretching?

    26898_2_rotax-servicing-912uls-part-16-0314-cylinder-barrel-and-stud-removal-_std.jpg (You do not have access to download this file.)

  • Re: Stud bolts turning in Crankcase

    by » 6 months ago


    Dear Johann Johannsson

    until you open the crankcase by removing all cylindersx4, the adjustment /alignment of stud from inside the crankcase is not possible.

    as you hold the stud from the backside and adjust/align it.

    In this way, if the stud does not aligns/relocate to the original position, the crankcase needs replacement.

    its become a major overhauling case.

     


  • Re: Stud bolts turning in Crankcase

    by » 6 months ago


    Hello Mr Wang.

    Thank you for helping me with this problem. I just do not know why this hex nut is turning inside the housing. That is the mistery, and is a poor design to a very reliable engine. I am waiting for some new studs for the engine and will be replacing them all and will let you know if this will solve the problem.


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