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Severe Jittering Oil Pressure

in 912 / 914 Technical Questions 9 years ago

  • Re: Severe Jittering Oil Pressure

    by » 8 years ago

    Michael, I'm the original poster to this thread. My manual oil pressure gauge behaves just like the one on your video once the engine warms up. Just today, I replaced the pressure regulator parts (ball, spring and plug screw) for the fourth time on a 160 hour engine. As usual, it fixed the problem. Oil pressure readings are now rock solid. Based on past history, I expect this fix will last 25 to 50 hours before the jittering oil pressure problem returns. I filed another "on-line" problem report with Rotax. They really need to step up and find a solution to this ongoing problem.

    Alex
      
    Report

  • Re: Severe Jittering Oil Pressure

    by » 8 years ago

    Hi Alex,

    You have some other issue going on. This isn't a repeat problem with the oil pressure plug screw, spring and mushroom.
    have you replaced the old style oil pressure plug screw? If not that could be the problem. If you have did you repalce the ball bearing? If not you need to install the mushroom and toss the ball bearing. Once these are done then if this continues I would have a hard look at the pressure sender or gauge.

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

      
    Report

  • Re: Severe Jittering Oil Pressure

    by » 8 years ago

    Hi Alex,

    You have some other issue going on. This isn't a repeat problem with the oil pressure plug screw, spring and mushroom.
    have you replaced the old style oil pressure plug screw? If not that could be the problem. If you have did you replace the ball bearing? If not you need to install the mushroom and toss the ball bearing. Once these are done then if this continues I would have a hard look at the pressure sender or gauge.

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

      
    Report

  • Re: Severe Jittering Oil Pressure

    by » 8 years ago

    Update.

    I just changed to the mushroom, with a new spring, and a new pressure sensor. I also remotely mounted the sensor on the firewall, using a kit from Lockwood which includes an orifice. I couldn't fly because of weather/wind concerns, but the pressure was rock solid during warm up, starting out at 70 and dropping to 60 at 160 degrees CHT. It has never been this stable. I'm guessing the mushroom and orifice has something to do with that.

    Alan 699.7 hrs, 10.5 years
      
    Report

  • Re: Severe Jittering Oil Pressure

    by » 8 years ago

    Yes, The mushroom because of its shape and hole in the top prevent surface tension that and otherwise smooth round surface like the ball bearing might have that may cause the oil pressure to chatter / fluctuate. Many still have the ball bearing and don't have issues. A side effect of the mushroom was an increase of about 5 psi for some.

    I recommend the mushroom to everyone. Rotax at this point still uses the ball bearing. That one has kind of escaped my logic since they thought it was a good idea to Mfg it and recommend it, but not use it right out of the factory.

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

      
    Report
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