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On start up my 912 uls has 100 lbs+ oil pressure at about 2500 rpm is this unusual for it?It will drop to 80 psi after 15 min. or so(when the oil is warmed up to 110-120 deg F.) in the air it will hit 100 psi for a couple of minutes also, and then goes down to normal.Am I going to hurt anything with these pressures or is this normal?I also have another 912 uls that will stay within 80-90 psi after takeoff and then after a few seconds will normalize at 60 psi(normal).They both have the updated pressure relief valve in them.
  • Re: Oil pressure 912 uls.

    by » 10 years ago


    A little bit high.
    I have (after relief update) 5bar in startup and it drop's down do ~3,5bar when hot.

  • Re: Oil pressure 912 uls.

    by » 10 years ago


    Those pressures are awful high and not the norm. Two things. What oil do you use? Did you put any shims in the oil pressure plug screw?
    I would put a pressure gauge inline and compare oil pressure. My guess is that 80-100 psi isn't correct. You may just need a new pressure sender or it is possible you have a bad wire connection or a poor ground.

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


  • Re: Oil pressure 912 uls.

    by » 10 years ago


    Took out the one shim that was in it on the regulator and it now starts at 80 psi will give that a try when it warms up a bit.Thanks Roger!

  • Re: Oil pressure 912 uls.

    by » 10 years ago


    Normally it should be no or one shim in regulator.
    I have one shim, new spring and new type valve and it's work's fine.

  • Re: Oil pressure 912 uls.

    by » 10 years ago


    Too many people put oil pressure shims in without confirmation of a TRUE low pressure from the engine. The low pressure is from something else and then the owner sees that on the gauge which may be wrong too and automatically puts a shim in.

    You really should confirm you have a real low pressure situation before just tossing a shim in. You may raise the reading on your gauge, but that may be over max with the underlying true pressure. Anytime I have an oil pressure that is in question I put a mechanical gauge inline to confirm what is seen in the cockpit. 98% of the time what the owners sees in the cockpit is a bad reading and not the true pressure.

    You don't need special gauges to check this. For about $20 you can make a quick and easy test gauge setup.

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


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