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I hope I am not covering old ground here. I have the 80hp 912. 40 hours since new. Installed by myself. Everything fine until today. Oil temp usually 80-90 Deg C, jumped to 135 and would quickly come back to 80-90 when closing the throttle. I was a little freaked out so did not spend much time before precautionary landing. Pretty sure the oil pressure was fine during all this. Landed, had a look around, checked no leaks, oil tank able to be touched for many seconds, not consistent with 135 deg C!. Noted some corrosion around oil temp sender. Gave the spade connector a bit of a clean, let the motor cool down, got airborn, flew home, temp never got above 70-80. Was this just an electrical issue. Can't imagine why the temp would all of a sudden go high, especially since the oil tank wasn't super hot to touch.
  • Re: Erratic Oil Temp

    by » 12 years ago


    Don't be concerned, this is an instrumentation issue for sure. Do you have an EIS? Dynon?

    Thank you said by: Paul Brydon

  • Re: Erratic Oil Temp

    by » 12 years ago


    MGL Instrument. Does rev counter, oil temp and pressure, hobbs. I will go looking for "shorts" or poor grounds tomorrow. Glad to hear no real engine problem as such. Am also glad I picked an ok place to land to check it over. Was in a bit of a panic/hurry. No harm done.
    Thanks.

  • Re: Erratic Oil Temp

    by » 12 years ago


    The oil temperature sender is a thermistor whose resistance falls with higher temperature. Your MGL Instrument is reading resistance to aircraft ground through the oil temperature sender. So high temperature spikes equal low resistance spikes as read by the MGL Instrument.

    I recently had a (oil thermostat) customer with a Dynon with a similar problem - transient high temperature spikes. In his case the problem turned out to be a resistor (200 Ohm ?) in the lead from the oil temperature sender to the Dynon. This resistor was failing short intermittently. Look for something like that. Poor grounds are also very popular for instrumentation problems.

    Thank you said by: Paul Brydon

  • Re: Erratic Oil Temp

    by » 12 years ago


    Oil temp problem solved. Was loose plug into back of gauge.

    Thanks for the suggestions.

    Paul

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