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Hi, I will be replacing the valve piston(857230), compression spring(838122) and plug screw(841983) on my ROTAX 912 ULS lub oil pump.

i intend doing this at the next oil/filter change and mag plug check.

My intention would then be to turn the engine with top spark plugs out to ensure I have oil pressure.

Once I have good oil pressure my intention would be to replace the plugs, check the oil and once level is correct start the engine.

My concern is, since I have replaced the aforementioned Lub Oil pump parts should I go through a full purging process in case air got in during short time it too to change these components.

thanks

  • Re: Oil pump pressure regulator

    by » 7 months ago


    I would certainly do the full purge after anything but a routine oil change.


    Thank you said by: Archie Nicholson

  • Re: Oil pump pressure regulator

    by » 7 months ago


    All of those parts are AFTER the Oil Pump and BELOW the Oil Tank.

    Expect a very small dribble of Oil coming OUT.

    Air will not be going IN.  NO Purge needed!

     - - -

    WHY are you changing these parts???


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


    Thank you said by: Archie Nicholson

  • Re: Oil pump pressure regulator

    by » 7 months ago


    Thanks for your reply.

    reason I am changing them is I have a MGL EFIS and the oil pressure fluctuates between 2.1 bar and about 4.5 bar when at normal operating temperature in flight.

    i don’t believe there is an oil pressure issue, the engine has 160 hrs and I have owned it since 120 hours. Everything else is normal

    Read somewhere that the electronic readout maybe very sensitive to the original ball / spring arrangement so thought I would try a new spring with valve piston instead of the ball and and a new type plug screw with a longer internal bore which may (or may not) steady the spring.

    just trying to iron out the fluctuations as disconcerting to myself especially due to my motor engineering profession.

    thanks again for your interest and response.


  • Re: Oil pump pressure regulator

    by » 7 months ago


    This is Deja Vu all over again.

    Your new parts will probably make very little difference.

    Check out This Thread


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


    Thank you said by: Archie Nicholson

  • Re: Oil pump pressure regulator

    by » 7 months ago


    Thanks again, deja vu right enough.

    will see how it goes and as looks likely will not make any difference will contact you at your email.

     


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