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Thread: EGT and CHT meters

  1. #1

    EGT and CHT meters

    Hello musketeermail members,

    We are currently experiencing false indications with our EGT and CHT
    meters. The EGT is indicating a lower then normal value and the CHT
    indication wobbles. My AP indicated that the wiring seems to be ok. Can
    these be OH or repaired? If so, would anyone know where I could get
    those repaired preferably in Canada or should I think of replacing them
    instead? What would be the replacement part numbers for these parts?

    Thank you very much for your help.

    Steph C-GMKY (Beech C-23 M1312)


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  2. #2
    I had an intermittent EGT meter, sometimes it reads low, sometimes it doesn't read at all.

    The EGT probe was checked out fine and so too the wiring, so it turned out to be the meter.

    The meter was removed and cleaned up due to a slight amount of corrosion, and then it was tested with a multimeter. For some reason there was insufficient tension on the movement spring, which can be fixed by rotating the appropriate adjustment - must have shaken around with the vibration of the the IO-360.

    The slider was re-adjusted so the external adjustment knob arm can move it either side.

    Sometimes the slider moves off to one side and then out of reach of the arm never to work again until put back in place, which requires dissassembly of the meter housing. This is what happened to mine.

    The spring tension was too low presumably because the slide managed to vibrate round and round - those dang IO360 engines that shake.

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