Rotax 912 ULS CHT indication fix?

Hi all,

I have 701 with Rotax 912 ULS which I di not build

My left bank CHT gauge recently stopped working.

I want to gather info and perhaps replacement parts before I take off the cowling and start investigating.

I assume it can be 

Faulty sensor

Connection - CHT sensor to gauge wire

Broken wire

Connection - gauge wire to CHT gauge

Bad gauge

What do you think is most likely?

I am very familiar with small 2 strokes for powered paragliding and the sensor is bimetal ring that goes under the spark plug. What does the sensor look like and where is it located on Rotax 912 ULS?

Thanks in advance for any answers

Andre

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Permalink Reply by Bob Hartunian on January 29, 2021 at 8:26pm

Don't know what readout instrument you are using. I'd run a continuity check on leads going to readout. This will tell whether any lead is disconnected/broken. The official 912 CHT probe is a thermistor that screws into cyl head. If the readout instrument uses a thermocouple instead, many are done by a ring washer with TC leads attached and it's placed under a bolt screwed into same port as the thermistor. So start by looking and tracing the location of the sensor to determine which type is being used. The TC (thermocouple) will have 2 leads and thermistor has one lead.

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