fbpx

 

Upon initial installation (newer Rotax 914, latest Rotax oil pressure sensor, Dynon Skyview) oil pressure correctly read zero. After filling the engine and purging, pressure remained at 4 psi.

I opened the oil system to insure there was really no pressure on the sensor, and it stayed at 4 psi. I then did my initial startup, ran the engine just long enough to confirm oil flow from the turbo, and shut down. Pressure lingered around 10 psi for a bit, then dropped to 4 psi and stayed there.

Has anyone run into this?

  • Re: oil pressure when engine off

    by » 3 months ago


    Pull the wire off the Oil Sender.

    The panel gauge should read ZERO.

    If it doesn't, there is a wiring problem.  Chaffing???

    If it reads zero, measure the sender's resistance.

    It should be >240 ohms.

    If it is reading ~225 ohms, that is where your 4 psi is coming from!  Sender problem!

    It will probably need replacement, but flushing it out with kerosene in a squirt bottle is worth a try.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    whertzel1@yahoo.com
    Clicking the "Thank You" is appreciated by all.

    Thank you said by: Ken Ryan

  • Re: oil pressure when engine off

    by » 3 months ago


    Thanks Bill. Where did you get that resistance data for the sensor?


  • Re: oil pressure when engine off

    by » 3 months ago


    The most common sender is 240-30 ohms. 0-80 psi

    You may need to look yours up if it is different.

    It may be stamped on the sender's body.

    But the general troubleshooting procedure will be the same.

    It will at least get you pointed in the right direction!

     


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    whertzel1@yahoo.com
    Clicking the "Thank You" is appreciated by all.

  • Re: oil pressure when engine off

    by » 3 months ago


    Just found this...

    https://www.dynonavionics.com/includes/guides/Addendum_Kavlico_Sensors-Rev_C.pdf

    It is not a "Problem" is is a "Feature".  

    - - -

    If you have a 3 wire sender.  Ignore my previous instructions.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    whertzel1@yahoo.com
    Clicking the "Thank You" is appreciated by all.

  • Re: oil pressure when engine off

    by » 3 months ago


    Bill,

    That Dynon document is definitely interesting, but it is talking about Kavlico sensors (is the Rotax sensor a Kavlico sensor?) and it does not refer to Skyview, only earlier Dynon systems (but they may have published a separate document for Skyview). Another thing that isn't quite right is the document says a 4 psi reading occurs with the 50 psi sensor. Surely the sensor is not the 50 psi sensor.


You do not have permissions to reply to this topic.