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I have a 912 ULS with analog UMA CHT gauge.  I started engine up, warmed it, taxied to do runup but when I ran engine up to 4000 rpm to check things out, the CHT gauge was in the red.  So, I taxied back to the hangar.  I let it sit for a while, then restarted engine.  It appeared ok until I increased the RPMs then needle jumped to the red again.  Is this most likely a gauge or sensor problem?  Thanks.

  • Re: CHT Issues

    by » 6 weeks ago


    Make sure the connector at the probe is snug and not loose. if it's loose you can squeeze it with a pair of pliers. It could be a loose connection somewhere else on the wire into the gauge.


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


  • Re: CHT Issues

    by » 6 weeks ago


    Have you definitely got coolant in the reservoir on top of the crankcase? Do the coolant hoses all feel hot?

    You could swap the CHT & oil temp sensor connections and see if the high temp moves to the oil temp gauge. If it does then you have a sensor fault or genuinely high temperatures. If the high temp stays with the CHT then it is a gauge fault. If it is the former, then you'll have to swap the sensors (they are the same) to see where the fault ends up.


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