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  • Re: Oil return line

    by » one year ago


    I have never seen a 7/16" oil hose on a Rotax 912 series. I would question whomever did it and change it.


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


  • Re: Oil return line

    by » one year ago


    Fred

    The engine uses the piston blow-down pressure (pressure bypass of the rings) to push the oil back to the oil tank.  If the return line from the block to the oil tank is too small, or restricted in any way, it will then build pressure inside the crankcase.  If the pressure is too high it will push the seals.  The test has to be done on the ground and not in flight. 

    Cheers

     

    30249_2_IM 912 manual P2 2021-07-30_05-32-33.jpg (You do not have access to download this file.)
    30249_2_IM 912 manual 2021-07-30_05-31-45.jpg (You do not have access to download this file.)

  • Re: Oil return line

    by » one year ago


    I bought fittings and hose from leading edge . The only hose they offer is 12mm. There is only one fitting size offered by rotax so what size are the fittings 12.12.5 or 13mm?

     


  • Re: Oil return line

    by » one year ago


    If you purchased the 840461 Fitting for the Oil Pump, it is listed as " NIPPLE 13.2/9.5-M14x1.5 " 
    It is M14x1.5 on the Pump Side and 13.2mm OD and 9.5mm ID on the Barbed end.
    12mm hose will give you a good tight fit.
    I can only guess that the Oil Tank Fitting will be similar.


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


  • Re: Oil return line

    by » one year ago


    If it doesnt work Ill have to look for large ID hose. Maybe the higher HP engine needs it. I also looked into custom  Teflon hose but they said they only have 11 MM.

     

     


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