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912S back firing problems + ignition timing

in 912 / 914 Technical Questions 12 years ago

  • Re: 912S back firing problems + ignition timing

    by » 12 years ago

    Hi Jaap.

    Do you only have change the flywheel or also the sprag clutch
    at the same time?
    Changing both is good but makes us question if the solution is to be on one or the other repair.

    Thanks
    Robert
      
    Report

  • Re: 912S back firing problems + ignition timing

    by » 12 years ago

    Hello Robert,

    Due to the fact that during our previous trouble shooting we have experienced many times violent back firings , and while continueing with all kind of error seeking like mixture igntion etc , our sprag clutch has expereinced so many violent back firing that at a certain moment while staring / cranking the engine it sounded like a old fashioned coffee beans shredder.
    So coming on the questions if your spragclutch has to be replaced ; it all depents how many violent kick back it might have suffered . When occasionally a few times you might concider to leave it as it is . However if any doubt => replace it also .

    Rgds
    Jaap
    Aero Club Valkenburg Netherlands
    www.ac-valkenburg.nl
      
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  • Re: 912S back firing problems + ignition timing

    by » 12 years ago

    Hi Jaap,

    You are absolutely right. If any of you have a kick back problem on start up you need to find out what the cause it immediately. Too many kickbacks can indeed destroy the sprag clutch. That requires the removal of the stater / water pump housing on the engine and special tools.

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

      
    Report

  • Re: 912S back firing problems + ignition timing

    by » 11 years ago

    Hi guys,

    I'm very worry with my sprag clutch right now. Is a faulty sprag clutch can cause an in-flight engine failure or it acts only on start-up?

    Thank you
      
    Report

  • Re: 912S back firing problems + ignition timing

    by » 11 years ago

    Greg,

    The sprague clutch is only in use during engine starting. Once the engine is running, it is no longer functioning.

    Bill.
      
    Report
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