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Oil pressure drop to zero

in General Tech Discussion 5 years ago
The oil pressure drop to zero when the engine getting hot (in the green area) , what is the funktion of the screen in the oil tank, is it to prevent the oil to foaming, can it be so that the pump can not suck the oil if there will be some air bubbles in the oil and the pressure goes to zero.

  • Re: Oil pressure drop to zero

    by » 5 years ago

    The Oil is returned to the Oil tank under the force of the crankcase blowby pressure.
    It Spits and Gurgles into the outside of the tank.
    The screen separates the oil from the majority of the air.
    The hotter the Oil the quicker the Air will separate.
    The will always be some small amount of inconsequential air bubbles carried in the Oil.
    They will not cause your oil pressure to change.

    The Oil external to the engine is not under any significant pressure.
    The Oil hose from the engine to the Oil tank has well less than 5psi of pressure.
    The Oil Hose from the Oil tank to the Oil Pump has a few psi of suction.

    Zero pressure with a hot engine is most likely caused by the suction Oil hose becoming soft at higher temperatures and collapsing, causing the oil flow to stop.

    Inspect your Oil Pump Input hoses for soft spots or tight radiuses.
    A tried and true solution is to insert a stretched spring within the suction hose to prevent it from kinking or collapsing.

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

    Thank you said by: Roy D. Roller
      
    Report

  • Re: Oil pressure drop to zero

    by » 5 years ago

    Thank´s for the answer

    Regards

    Steven
      
    Report
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