Dood Posted May 9, 2018 Report Share Posted May 9, 2018 (edited) Hello, after a period of inactivity of 4 months, I find that I can not raise the temperature of the oil of my aircraft to more than 165. it is very low and I even received a warning from savvyanalysis because 96% of aircraft have a much higher temperature. Anyone has an Idea ? thanks cyrille Edited May 9, 2018 by Dood Quote Link to comment Share on other sites More sharing options...
carusoam Posted May 9, 2018 Report Share Posted May 9, 2018 Cyrille, Talk to your mechanic... the vernatherm seems to be stuck open1, sending the oil to the oil cooler all the time... the vernatherm is temp sensitive and gets tested by putting it in a pot of water. Raising the temp, closes the valve... if it doesn’t meet spec it gets replaced... keep an eye open for anything stuck in the valve.... chunks of metal would be bad.... (unlikely) PP thoughts only, not a mechanic... Best regards, -a- note 1: the vernatherm May be stuck allowing oil to flow to the cooler. Whether it is stuck open or closed depends on what oil line it is in...? Quote Link to comment Share on other sites More sharing options...
Marauder Posted May 9, 2018 Report Share Posted May 9, 2018 Hello, after a period of inactivity of 4 months, I find that I can not raise the temperature of the oil of my aircraft to more than 165. it is very low and I even received a warning from savvyanalysis because 96% of aircraft have a much higher temperature. Anyone has an Idea ? thanks cyrille It sounds like your Vernatherm is stuck open.Sent from my iPad using Tapatalk Pro 1 Quote Link to comment Share on other sites More sharing options...
N231BN Posted May 10, 2018 Report Share Posted May 10, 2018 A common misconception here but a vernatherm actually works backwards from a thermostat in a car. When it expands it plugs off the cooler bypass and forces the oil to go through the cooler. If it was stuck open you would have high temps. There shouldn't be a failure mode of the vernatherm that results in low temps. Quote Link to comment Share on other sites More sharing options...
carusoam Posted May 10, 2018 Report Share Posted May 10, 2018 Thanks MB231... I added some edits to my post... Check out my fancy edits above... I’m not sure where the vernatherm is located on my plane... in the cooler by-pass line, or the cooler’s oil line... Either way... if it failed, it is allowing oil to the cooler when it shouldn’t... and can be tested in a pot of hot water... If the vernatherm passes the test... it is probably a gauge issue after that... Compare OilT to the actual temp of the oil...measured independently. PP thoughts, -a- Quote Link to comment Share on other sites More sharing options...
N231BN Posted May 11, 2018 Report Share Posted May 11, 2018 19 hours ago, carusoam said: Thanks MB231... I added some edits to my post... Check out my fancy edits above... I’m not sure where the vernatherm is located on my plane... in the cooler by-pass line, or the cooler’s oil line... Either way... if it failed, it is allowing oil to the cooler when it shouldn’t... and can be tested in a pot of hot water... If the vernatherm passes the test... it is probably a gauge issue after that... Compare OilT to the actual temp of the oil...measured independently. PP thoughts, -a- On the IO-550-G the vernatherm is in the bottom of the cooler itself. Item 15 in the attached dwg. On the OP's aircraft, it depends on the engine but it is usually in the oil filter housing. No matter where it's located the function is the same. Oil is allowed to bypass the cooler core and as it warms up the vernatherm expands to block the bypass forcing oil through the core. It has a pressure relief spring on the end which allows oil to pass in the event of a plugged or congealed oil cooler so it doesn't explode! It is 1930's technology in a smaller package, pretty ingenious. 1 Quote Link to comment Share on other sites More sharing options...
carusoam Posted May 11, 2018 Report Share Posted May 11, 2018 Thanks again MB231! Now that’s an MS style answer! Technical detail with drawings! Go MS! Best regards, -a- Quote Link to comment Share on other sites More sharing options...
Dood Posted May 13, 2018 Author Report Share Posted May 13, 2018 Thanks, i’ll Check the vernatherm beacuse i’m sure it isn’t A faultly sensor booth (EDM and gauge) give the same indication with two different sensors. Quote Link to comment Share on other sites More sharing options...
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