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Oil Temperature Thermostat

in 912 / 914 Technical Questions 12 years ago
Would like to install an oil temp thermostat to the oil circuit of my 80 hp 912 to acheive min temp sooner on warm-up and maintain it at higher altitudes without guessing how much cooler to cover with tape. Temps below 180F. seem to have a direct effect on oil pressure (lowering) apparently due to oil pump starvation. The question is, how do you purge the oil system per Rotax bulletin with the thermostat in place? If cold, only the bypass side will be purged and, if hot, the cooler side. Is it necessary to artificially heat the thermostat to open it while purging? Anyone had experience with this?

  • Re: Oil Temperature Thermostat

    by » 12 years ago

    The way I understand it is the thermostat always allows a little oil to pass through it, but opens up more when the oil heats up.
    Thank you said by: Paul Winder
      
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  • Re: Oil Temperature Thermostat

    by » 12 years ago

    Thanks, James, do you think the first oil pressure indication would still mean the air is out or would you push a little extra oil through?
      
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  • Re: Oil Temperature Thermostat

    by » 12 years ago

    Paul,

    The oil thermostat never closes off the oil flow to the cooler completely. The reason being that If you shut it off completely, when the thermostat opened it would suddenly dump very hot oil into a very cold oil cooler. By letting a little oil through the cooler constantly, it is warmed and gets no cold shock from being suddenly filled with hot oil as the thermostat opens. You can purge a cold engine with a thermostat per rotax instructions just as you would an engine without a thermostat. It just may take a few more pulls on the prop. If you are adding the thermostat to an engine that has already been run, and your inlet and outlet are on top of the oil cooler, the cooler will be full of oil already and you should have no problem at all purging. If your inlet and outlet are on the bottom of the cooler, it may take a little longer to get the air out of the cooler. Richard can probably give you more details than I can.

    Bill.
    Thank you said by: Paul Winder
      
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  • Re: Oil Temperature Thermostat

    by » 12 years ago

    I removed the upper spark plugs and turned the prop over by hand until I had oil pressure on my gage and then installed the spark plugs and turned engine over until I heard the gurgle in the oil tank serviced the tank up to the full mark. I then started the engine keeping a close watch on the oil pressure, ran engine maybe 5 minutes or so and shut down and checked oil level in tank again, at that time I had to add a bit more. Thats what I did.
    Thank you said by: Paul Winder
      
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  • Re: Oil Temperature Thermostat

    by » 12 years ago

    Here is the correct way to purge the system. Just rotating the prop and looking for oil pressure will give a false reading. You may get oil pressure, but still have air in one of the lifters and then you run it and the lifters can't pump air so you ruin the lifter, rod and more. You need pressure to all areas that get oil and depend on the oil to operate correctly. Oil purges aren't hard and really don't take that long once you have done one.



    http://www.rotax-owner.com/information-reg/expanded-video-instructions-reg/33-exp-si-912-018

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

    Thank you said by: Paul Winder
      
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