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high oil pressure at startup

in General Tech Discussion 13 years ago
Can anyone explain why the oil pressure on my 912uls at startup shows max.. and then decreases to between 4-6 after warmup..is this normal? engine has 700 hrs on it and has always reflected as described. seems odd..the max at start up that is..

  • Re: high oil pressure at startup

    by » 13 years ago

    Hi Dave,
    I take it by saying 4-6 you mean bar.
    Max is 73 psi (4.9 bar) and that can be normal at first crank of the day especially when the weather is cool or cold. Usually the normal when it settles down and as it warms up is usually 45-60 psi (3-4 bar) with 50 psi (3.4 bar)fairly normal. Some have pressures as low as 35-40 psi. That may be the sender or even the old oil pressure regulator system not doing as good as a job as it could.

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

      
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  • Re: high oil pressure at startup

    by » 13 years ago

    Thanks for the interest Roger.. yes I do mean Bar.the normal operating pressure i have no problem with as it is spot on spec.. my dilemma is the initial max oil pressure .. more than 10 on my gauge..which gradually decreases as the oil temp climbs to about 50 deg C when the oil pressure then settles at about 5 bar... any ideas ? I have always put it down to a sender problem.. what do you think?
      
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  • Re: high oil pressure at startup

    by » 13 years ago

    Sorry Roger..I am slow on the uptake.. you have already answered my question.. as you say it could be a pressure reg. problem.. thanks for that.
      
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  • Re: high oil pressure at startup

    by » 13 years ago

    Hi Dave,

    With this new info I am leaning towards the sending unit. 10 bar is 147 psi which is so far out of line that it is hard to believe. Many of our oil pressure gauges only go to 100 psi. Even where you say it settles at 5 bar (73 psi) sounds too high to be an accurate reading. 73 psi or 5 bar is the max allowable oil pressure.
    I believe it is the sender, but the only way to know for sure is to compare it with another gauge. If you happen to have a spare sender you could just pop it in a check, other wise it may be a good idea to use a second in line gauge to check the real pressure.
    One way to double check this is to put a mechanical gauge in line with the other oil sender and compare one against the other. This is very easy to do and can be done for about $20 in parts.

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

      
    Report

  • Re: high oil pressure at startup

    by » 13 years ago

    Roger.. Ok got that I will check it against another sender unit.. thanks for the help .I'll let you know what transpires.
    D
      
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