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Severe Jittering Oil Pressure

in 912 / 914 Technical Questions 9 years ago

  • Re: Severe Jittering Oil Pressure

    by » 9 years ago

    75 psi is high and may not be real. Normal for most folks is 40-55 psi. Volume is important and high psi isn't.

    Just a few items to check and rule out.
    If mine was jittery I would first put a mechanical gauge inline to see if it was real. Then bypass my installed ground wire and install a direct ground to the gauge from the battery just for a run up check to see if it is still jittery, swap the sender out and or replace the oil pressure regulator ball bearing or mushroom and spring with new ones.

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

      
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  • Re: Severe Jittering Oil Pressure

    by » 9 years ago

    Roger,
    My oil pressure also runs around 75lbs when cold. Drops to around 55-60lbs when oil is hot. Both my mechanical and elecronic gauges indicate the same. I had the same behavior as Paul. Pressure solid when oil is cold, but it jitters when oil is at normal operating temperature. Jittering was reduced to a tolerable level after I replaced the ball, spring and plug. I'm not convinced its fixed, since that is what I did the last time to fix the issue, but it came back after about 25 hours. I guess time will tell.
    Alex
      
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  • Re: Severe Jittering Oil Pressure

    by » 9 years ago

    On first cold starts sometimes the oil pressure can pop up higher than normal like your 75, but should drop down as yours does as it warms up.

    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

    Had an oil pressure issue a few days ago that had me scratching my head, and after a bit of scrolling, found this thread.

    Was cruising wen i noticed the oil pressure gauge on 0.
    Thankfully i fly rotors, so it didnt take long to put down from 100' and shut off.
    Checked everything i could in the middle of woop woop and found nothing unusual.
    Started up and felt the oil line change temp so i know i at least had circulation.
    Anyway, once i was home i found the vdo gauge to be ok, tryed 2 other identical vdo senders said no pressure, then a mechanical gauge indicated very irratic pressure.
    Found this thread, arranged a mushroom and tryed it today.
    Turns out, after a serious dummy spit, that the electric vdo gauges didnt respond coz there was a dead short in the lead.
    VDO works now, as it has for thousands of hours.
    Havent checked with the mechanical one yet, to see if the mushroom did the trick, BUT, it begs the question, how many 9## rotaxs are happily flyn round with wild, rapid oil pressure variations, that are averaged out with the use of electric VDO gauges?
    And dose it matter?
      
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  • Re: Severe Jittering Oil Pressure

    by » 8 years ago

    My oil pressure has been fluctuating somewhat with a high of 60 and a low of 20. I had replaced the plug screw with the new style last year. Today I took it apart again to check for debris and found none. What I did find, while looking at the exploded diagram, was no shim p/n 227 055, and a ball p/n 432 680, which I apparently should have replaced with the cone p/n 857 230.
    Would this explain the fluctuations? I plan to order these parts Monday and not run the engine until I have installed them.

    Also, there is no gasket but also no leak. Should some sort of sealant be used on the threads?

    Thanks for your help.

    Alan 912ULS 2006 700 hours
      
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