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Hello,

 

I added the Franz oil Thermostat on my Rotax 912 ULS because the temp was really low (75-80 C°)

after the installation the temp raise up to 110-115 C° considered an ext temp of 5 C° it's something wrong?

 

9036_1_pic.png (You do not have access to download this file.)
  • Re: High oil temp with Franz oil thermostat

    by » 5 months ago


    It sounds like the thermostat is not Closing and is continuously bypassing the Cooler.
    Remove the Thermal Cartridge and place it in a pan of water on a stove.
    Does it close as expected when you heat up the water?

    Any chance the Flow direction is reversed?
    - - -

    Roberto,
    Please contact me directly at the Email Address below.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Roberto Trivella

  • Re: High oil temp with Franz oil thermostat

    by » 5 months ago


    While you're checking the thermostat make sure no oil hose makes such a sharp turn like a 180 degrees where the hose at the bend is collapsing and slowing the oil flow. I have seen many like this and I put a spring inside to keep the hose fulling open. It usually drops the higher temps by around 20F. I'm not bending the hose in the picture. It's the way I found it.

    31731_2_Hose Crimped.jpg (You do not have access to download this file.)

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


  • Re: High oil temp with Franz oil thermostat

    by » 5 months ago


    Roger's idea of a kinked hose is a good call.
    Are you also seeing unusually low Oil pressure? (<2 bar?)

    I am not sure if there is a wrong way to install the Thermostat.
    Most installations appear to have the flow coming IN the Large Diameter end and OUT the smaller pipe end.
    Is there any chance that the Thermal Element is mis-installed or missing?


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


  • Re: High oil temp with Franz oil thermostat

    by » 5 months ago


    Here is a hose that will not collapse at 266 deg under a full vacuum while tied in a knot, it is teflon and should last the life of the aircraft.

    https://www.pegasusautoracing.com/group.asp?GroupID=PLUMANFLEX

     


  • Re: High oil temp with Franz oil thermostat

    by » 4 months ago


    I take a picture of the lower part of the thermostat, the tube is bend 180° do you think could be a problem? the pressure still in the green arc.

     

    31880_2_pic222.png (You do not have access to download this file.)

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