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Valve cover gaskets-912ULS

in 912 / 914 Technical Questions 9 years ago

  • Re: Valve cover gaskets-912ULS

    by » 9 years ago

    I find the revision control of the heavy maintenance manual very strange. The latest for the 912UL is meant to be Edition 1 Revision 3 Oct 01/2010 but a number of the pages on the document still show Edition 1 Revision 0 May 01/2007. How does that work?

    Anyway, I can only find reference to 10 Nm on the top of page 93. Interestingly in the 912iS manual it states 12 Nm (top of page 29). It looks like it uses the same bolt and gasket so why the difference? It may be that the slightly higher torque fixes pesky oil leaks ;-)

    Kevin
      
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  • Re: Valve cover gaskets-912ULS

    by » 9 years ago

    It can be confusing as to which document to follow for the correct torques and loctites, lubricants etc. The Parts catalogue may have one figure, the Maintenance Manual a different figure and then a Service Bulletin something different again.
      
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  • Re: Valve cover gaskets-912ULS

    by » 9 years ago

    I'm just getting ready to hop a plane. It's a travel day for me. Let me get home and look for it.

    Maybe Rob is hanging around and can respond.

    I do know the one 912uls Heavy maint. manual says 10nm and the 912is is 12nm. I'm sure Kodiak told me this a couple years back. I'll get back to you when I get home.

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

      
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  • Re: Valve cover gaskets-912ULS

    by » 9 years ago

    The valve cover torque is still 10Nm-90 inlbs for the 912 & 914 series engines.The Heavy Maintenance Manual is the authoritative document.
    At some point it will be standardized with the 912iS but I don't know for sure what the value will be but I suspect it will be 10NM.
    Always check the Table of Amendments if you are not sure what the revision status of your manual. The footer of each page is not a reliable way to check the revision status as many pages get changed over the years and many pages remain unchanged over the years.
      
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  • Re: Valve cover gaskets-912ULS

    by » 9 years ago

    Rob just to confirm so we all understand.
    You suggest we should use the HMM which I agree should be the way it is done, however the IPC was updated last year with new loctites and a number of changes to the torque settings which are different to the HMM.
    One example for this is the sprag clutch nut.
    HMM (dated Oct 2010)- Taper Loctite 221, Nut Loctite 648 & torque 120Nm
    IPC (dated Jan 2014) - Taper Loctite 603, Nut Loctite 603 & torque 150Nm.

    If we were to follow the IPC which is a later publication does this torque apply to earlier engines as well, I know they may have a slightly different sprag housing with a different clearance.
      
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