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High oil pressure on 912 ULS

in 912 / 914 Technical Questions 7 years ago

  • Re: High oil pressure on 912 ULS

    by » 7 years ago

    Thanks for the file.
    If it is not the VDO sensor what could then be the cause? Pressure regulator? Replace the spring and ball?
      
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  • Re: High oil pressure on 912 ULS

    by » 7 years ago

    The answer is YES! It could be anything!

    If you are saying you are seeing 5bar at idle immediately after startup and then 4 bar in flight with a hot engine, I would suspect the instrumentation first.

    Do you see ZERO pressure with the engine Stopped?
    Does the pressure increase with increasing engine speed? Or does it just remain constant?
    Does the pressure decrease with increasing Oil Temperature.

    The first thing to do is remove the oil sender and install a mechanical Dial and Needle type pressure gauge.
    It is unlikely the ball and spring are the problem, but they are an easy One Bolt inspection.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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  • Re: High oil pressure on 912 ULS

    by » 7 years ago

    Zero pressure when engine is stopped.
    Pressure does not increase with increasing RPM.
    Pressure decreases slightly with increasing oil temp: 5 bar from ambient to about 90 degrees C and 4 bar @ 105 degrees C oil temp.
      
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  • Re: High oil pressure on 912 ULS

    by » 7 years ago

    I would suspect instrumentation first. Install the gauge! <---<<< ***
    105°C Oil at Cruise should be below 3 bar.

    Confirm: 5 bar at startup idle?

    Unless the engine is plugged up...
    What Oil do you use?
    What Fuel? Mogas or 100LL?
    When was the last Oil Change?

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

    Thank you said by: jan kerstens
      
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  • Re: High oil pressure on 912 ULS

    by » 7 years ago

    YES it is 5 bar at startup idle! Could there be an unnecessary shim under the spring of the pressure regulator? Will check this.

    ROTAX 912 ULSFR overhauled April 2017
    Oil: AEROSHELL Sport Plus 4
    Fuel: Mogas
    Oil change: April 2017
      
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