Bill3558 Posted March 25, 2022 Report Share Posted March 25, 2022 10 minutes from the airport I got a high EGT alert. Pulled power back to 4000 and went back to the airport. Here is a video of my static run up. Ordered a new sensor. I hope that’s all it is. I’m getting pretty unhappy with the reliability of the Rotax engine. IMG_0125.MOV Quote Link to comment Share on other sites More sharing options...
Skunkworks85 Posted March 25, 2022 Report Share Posted March 25, 2022 Most likely a loose connection, What does a failed sensor/loose connection have to do with engine reliability? Quote Link to comment Share on other sites More sharing options...
Tip Posted March 25, 2022 Report Share Posted March 25, 2022 Hi Bill, I had to replace a sensor that was doing the same on a 200 hour engine. Aircraft Spruce has them. Quote Link to comment Share on other sites More sharing options...
Bill3558 Posted March 25, 2022 Author Report Share Posted March 25, 2022 1 hour ago, Skunkworks85 said: Most likely a loose connection, What does a failed sensor/loose connection have to do with engine reliability? Maybe I’m just a cranky old guy. But I’ve had boats, motorcycles, and cars my whole life. I’ve never had an oil line come off, never had an oil pressure sending unit fail, , and never had an egt probe fail, never had a voltage regulator fail on any of them. I’ve had all three happen in 300 hours behind a Rotax. I have the IS engine. Lockwood says I have to disconnect the fuel rail to get to the connection. I’m already over my head and there is not a Rotax mechanic within a 100 miles. I’ll figure it out, but it seems like I am just waiting for the next “caution” when I fly now. Quote Link to comment Share on other sites More sharing options...
Anticept Posted March 25, 2022 Report Share Posted March 25, 2022 Rotax's electronics suck. You aren't alone in how annoyed we are with their choices in that department. Quote Link to comment Share on other sites More sharing options...
John Vance Posted March 25, 2022 Report Share Posted March 25, 2022 If I recall correctly, a loose connection would cause it to indicate low, not high. If this were a carbureted engine (Rotax), you might expect a high reading on cyl 2 to be mirrored on cyl 4, since they’re attached to the same carb. Maybe the electronics are working for you this time, and there’s a real problem. Clogged injector? Quote Link to comment Share on other sites More sharing options...
Tom Baker Posted March 25, 2022 Report Share Posted March 25, 2022 It would be running rough if a clogged injector really that made it run that hot. Quote Link to comment Share on other sites More sharing options...
Anticept Posted March 26, 2022 Report Share Posted March 26, 2022 Just got off work and saw the video. Loose connection. Causes them to run all over the place, high and low, with no rhyme or reason. A bad EGT usually just reads low or not at all. One thing to keep in mind is that the closest thing to the kind of stress aircraft engines and systems deal with, would be boats. We expect these engines to run at redline for minutes at a time, often longer, then down to 70% power for hours, with environments from hot to freezing, wet to dry, sometimes only minutes apart. EGT probes are right in the exhaust blast, inches away from the valves. The environment is really rough on them. In my experience, EGTs tend to have a lifespan of about 500 hours. Quote Link to comment Share on other sites More sharing options...
Bill3558 Posted March 28, 2022 Author Report Share Posted March 28, 2022 On the assumption it might be a bad connection, I put some dielectric grease on the connector. It didn’t help. Installed new probe and did static run up to almost full power. Everything looked good so I hope the problem is solved. Appreciate the help. Quote Link to comment Share on other sites More sharing options...
Bill3558 Posted October 25, 2022 Author Report Share Posted October 25, 2022 And today #3 EGT sensor failed on a cross country flight. Had audio warnings and lane B light flashing the whole time. Landed to reset everything but it failed again on take off. Flew it home and ordered another sensor. 2 down, 2 to go. annoying. Quote Link to comment Share on other sites More sharing options...
okent Posted October 26, 2022 Report Share Posted October 26, 2022 I had this issue and went ahead and replaced them all. My plane is a 2013 and I just figure that there is an hour life and a shelf life once in use. No issues since. Quote Link to comment Share on other sites More sharing options...
Steve Moliterno Posted October 27, 2022 Report Share Posted October 27, 2022 I had the same erratic egt, traced it down to an exposed wire which the insulation was melted and shorting to the engine. The more bumps in the flight the more it shorted. Quote Link to comment Share on other sites More sharing options...
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