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Oil Pressure Drop on Take-off - SOLVED!

in 912 / 914 Technical Questions 5 years ago

  • Re: Oil Pressure Drop on Take-off - SOLVED!

    by » 5 years ago

    ... Are we talking the ground wire on the back of the Gauge? Or a wire on the sender?


    The answer is YES!

    Both the Gauge and the Sender have ground connections. And they both need to be good.
    The sender may be grounded in the engine compartment or, preferably, it may have the ground wire connected at the gauge.

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

      
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  • Re: Oil Pressure Drop on Take-off - SOLVED!

    by » 5 years ago

    OK Thanks Bill. I will check it out.
      
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  • Re: Oil Pressure Drop on Take-off - SOLVED!

    by » 5 years ago

    Had this same issue a few months ago.
    The guys here help me solve it.

    The low oil pressure on takeoff was due to a 5 in diameter bend that the last mechanic put in when he did the 5 year rubber. Previous owner Installed a thermostat which made a few spots pretty tight.

    I recall a 8 inch diameter bent the minimum. The low on takeoff is probably something like that.

    If your gauges are good, think about the mushroom style oil regulator, new spring and bolt for the low pressure other than takeoff.
      
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  • Re: Oil Pressure Drop on Take-off - SOLVED!

    by » 5 years ago

    That’s interesting as it’s not long had the rubber replacement. Do you know where in the system?

    I will trace all of the lines and check it out.

    Cheers
    John
      
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  • Re: Oil Pressure Drop on Take-off - SOLVED!

    by » 5 years ago

    So this weekend I went to the airfield to do some work on the plane, and try and get to the bottom of the oil issue.

    I checked all terminals and reseated them etc... still the same.

    Here is what I found and a short video.

    On cold start oil pressure hits about 80PSI and then when warmed up, and it drops to what looks to be about 40PSI.

    Then when advanced to 3000RPM, the pressure drops. At take off (5500+) it drops even lower.

    I might look to swap out the sensor first, and see what happens.

    See below.

    https://www.dropbox.com/s/5y57a6ny1rrsfsr/IMG_5039.m4v?dl=0

    Cheers
    John
      
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