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Clearences

in 912 / 914 Technical Questions 12 years ago
Where can I find the Crankshaft main bearing minimum and maximum clearences, 912 ULS :unsure:
Regards, Robert

  • Re: Clearences

    by » 12 years ago

    Hi Robert,

    Have you split the case?
    I believe that is in the Overhaul manual and that's guarded like the Roswell Aliens. They don't want the public splitting the case. Distributors that split the case usually spend a week back in Austria learning how and what specific tools you'll need.
    Do you have an Overhaul manual?

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

      
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  • Re: Clearences

    by » 12 years ago

    Yes I have split the cases and have checked the clearences with plastiguage. 1 journal has .002" clearence and 2 journals have .0015" clearence.
    Robert.
      
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  • Re: Clearences

    by » 12 years ago

    Hi Robert,

    Since you have split the case the only good source for this info may be a Rotax distributor. You'll need to call them. It may be limited info depending on the distributor. Maybe one that reads this forum may chime in. I do not have an overhaul manual.

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

      
    Report

  • Re: Clearences

    by » 12 years ago

    Robert,

    Don't know if this helps any, but there are two bearing groups, "group C" and "group D"

    The "C" bearing has tolerances of 1.820mm to 1.829mm thickness

    The "D" bearing has tolerances of 1.830mm to 1.839mm thickness

    I'm just guessing here but if you haven't spun a bearing or have no crank journal wear, You might be able to mike the bearings and see if they fall into the tolerance parameters. Don't know why they have two bearing sizes unless the "D" bearing is a one over bearing for a turned crank.

    Have tried to find an overhaul manual with no success. Would gladly pay for a manual if I could find one (if anyone out there is listening).

    Bill.
      
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