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Hello everyone 

I am experiencing a high oil temp in my 912 engine fited on an Autogyro CALIDUS. 

It goes high to the yellow arck and keeps moveng from High green to Mid yellow. 

I cleaned the oil cooler and the oil thermostat. 

It keeps doing the same . My area temprture is 40+ ,Hoever i was flying in July and Augast in Higher temperature but i did not face any high temp issues . The CHT is in the lower green 

Any body have any idea ? 

  • Re: High Oil Temp

    by » 2 weeks ago


    You need to determine if it is an instrumentation problem or genuine high oil temperature.If the oil pressure is lower than usual then you probably do have genuinely high oil temp.

    You could swap the sensor wires on the CHT gauge and the oil temp gauge. If the CHT gauge (now showing oil temp) gives the same high reading as before then you know that your gauges are probably working.

    You can always swap the CHT and oil temp sensors over to eliminate a sensor fault.

    I know from my own measurements that the gauges can have a 6-7°C error.

    The standard small Rotax oil cooler gives approximately a 15°C temp drop from inlet to outlet so you could tape a thermocouple to each pipe and measure the temp drop in flight. If the cooler is working correctly and not being bypassed by the thermostat then you might have an oil hose with too tight a bend that is collapsing when it gets too hot.

    Hopefully it will be something easy to find and fix.


  • Re: High Oil Temp

    by » 2 weeks ago


    Thank you very much for your reply. 

    I will do the sensors swap. And check . And diffntly i will post the feed back . 


  • Re: High Oil Temp

    by » 2 weeks ago


    This is what i was talking about . 

    30524_2_20210904_173415.jpg (You do not have access to download this file.)

  • Re: High Oil Temp

    by » 2 weeks ago


    It looks like your oil temp is just over 120°C but your oil pressure looks about 3.5 bar. I think that when I have seen oil temps as high as yours the pressure is less than 3 bar and closer to 2.5 bar due to how thin the oil has become at that temperature.


  • Re: High Oil Temp

    by » 2 weeks ago


    Awod, what size oil cooler does your gyro have? I changed out the small cooler for the large a few years ago for the same issue.


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