---------------------------------------------------------- LycomingEngines-List Digest Archive --- Total Messages Posted Mon 07/20/15: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:33 AM - erratic oil temperature indication (Markus Feyerabend) 2. 06:52 AM - Re: erratic oil temperature indication (Carl Froehlich) 3. 07:19 AM - Re: erratic oil temperature indication (Tim Andres) 4. 07:46 AM - Re: erratic oil temperature indication (Dan Bergeron) ________________________________ Message 1 _____________________________________ Time: 06:33:45 AM PST US From: "Markus Feyerabend" Subject: LycomingEngines-List: erratic oil temperature indication Hello all, I recently noticed that the oil temp reading in our Extra became erratic and the indication is jumping between about 160F and 200F. The high value seems to be at around the level I expect, while the low level is certainly too low. The needle in the temp gauge (Westach twin indicator for oil pressure and temp) is not moving slowly but jumping quite fast back and forth. It seemed to be ok when I warmed up the oil on the ground before an oil-change, but in flight (with higher oil temps) the problem came back. Has anyone seen something like this before and can give some recommendations to what we should look at? Im suspecting the temp probe right now, but as the plane is more then an hour away from my home, Id rather get as much suggestions from anyone experienced, before getting lost an endless "trial and error" hunt , chasing the issue. Thanks, Markus ________________________________ Message 2 _____________________________________ Time: 06:52:44 AM PST US Subject: Re: LycomingEngines-List: erratic oil temperature indication From: Carl Froehlich Probe. If you have a connector in line with the probe you might get lucky and find that is the problem - for that matter look over the probe wire itself to see if it has chaffed or otherwise damaged. Carl > On Jul 20, 2015, at 8:32 AM, Markus Feyerabend wrote: > > > Hello all, > > I recently noticed that the oil temp reading in our Extra became erratic and the indication is jumping between about 160F and 200F. > The high value seems to be at around the level I expect, while the low level is certainly too low. The needle in the temp gauge (Westach twin indicator for oil pressure and temp) is not moving slowly but jumping quite fast back and forth. > It seemed to be ok when I warmed up the oil on the ground before an oil-change, but in flight (with higher oil temps) the problem came back. > > Has anyone seen something like this before and can give some recommendations to what we should look at? Im suspecting the temp probe right now, but as the plane is more then an hour away from my home, Id rather get as much suggestions from anyone experienced, before getting lost an endless "trial and error" hunt , chasing the issue. > > Thanks, > Markus > > > > > > ________________________________ Message 3 _____________________________________ Time: 07:19:18 AM PST US From: Tim Andres Subject: Re: LycomingEngines-List: erratic oil temperature indication Almost a topic for the "aerolectric connection" instead of engines. You know the temp cant jump like that so its the gauge indicating incorrectly. Most likely a bad sending unit, or unintentional ground in the wiring. Most guages will peg to high if the wire is shorted to ground. Try wiggeling the wire as it leaves the sendor and see if you can make it move the gauge. But after a good inspection of the wiring the sending unit is what I would replace. Good luck Tim -------------------------------------------- On Mon, 7/20/15, Markus Feyerabend wrote: Subject: LycomingEngines-List: erratic oil temperature indication To: aerobatic-list@matronics.com, lycomingengines-list@matronics.com Date: Monday, July 20, 2015, 6:32 AM --> LycomingEngines-List message posted by: "Markus Feyerabend" Hello all, I recently noticed that the oil temp reading in our Extra became erratic and the indication is jumping between about 160F and 200F. The high value seems to be at around the level I expect, while the low level is certainly too low. The needle in the temp gauge (Westach twin indicator for oil pressure and temp) is not moving slowly but jumping quite fast back and forth. It seemed to be ok when I warmed up the oil on the ground before an oil-change, but in flight (with higher oil temps) the problem came back. Has anyone seen something like this before and can give some recommendations to what we should look at? Im suspecting the temp probe right now, but as the plane is more then an hour away from my home, Id rather get as much suggestions from anyone experienced, before getting lost an endless "trial and error" hunt , chasing the issue. Thanks, Markus LycomingEngines-List Email Forum - - MATRONICS WEB FORUMS - List Contribution Web Site - -Matt Dralle, List Admin. ________________________________ Message 4 _____________________________________ Time: 07:46:25 AM PST US Subject: Re: LycomingEngines-List: erratic oil temperature indication From: Dan Bergeron Markus I recently had the same issue on my Mattituck TMX-IO-360 (a Lycoming clone) installed in an RV-7A - I have the Grand Rapids Technology (GRT) dual display unit system which includes engine data - I replaced the sending unit - problem solved - in 515 hours of flight time I've replaced two EGT probes - one oil temp probe - one oil pressure probe - and one OAT probe - in every instance replacing the probe solved the problem - possible you have a bad connector or gauge but most likely it's the probe - not terribly expensive and easily replaced - at least on an RV-7 - not so sure about an Extra though - good luck Dan Bergeron RV-7A N307TB 515 hours since first flight early Aug 2009 On Mon, Jul 20, 2015 at 9:51 AM, Carl Froehlich wrote: > carl.froehlich@verizon.net> > > Probe. If you have a connector in line with the probe you might get luck y > and find that is the problem - for that matter look over the probe wire > itself to see if it has chaffed or otherwise damaged. > > Carl > > > > On Jul 20, 2015, at 8:32 AM, Markus Feyerabend wrote: > > > feyerabm@web.de> > > > > Hello all, > > > > I recently noticed that the oil temp reading in our Extra became errati c > and the indication is jumping between about 160=C2=B0F and 200=C2=B0F. > > The high value seems to be at around the level I expect, while the low > level is certainly too low. The needle in the temp gauge (Westach twin > indicator for oil pressure and temp) is not moving slowly but jumping qui te > fast back and forth. > > It seemed to be ok when I warmed up the oil on the ground before an > oil-change, but in flight (with higher oil temps) the problem came back. > > > > Has anyone seen something like this before and can give some > recommendations to what we should look at? I=C2=B4m suspecting the temp p robe > right now, but as the plane is more then an hour away from my home, I=C2 =B4d > rather get as much suggestions from anyone experienced, before getting lo st > an endless "trial and error" hunt , chasing the issue. > > > > Thanks, > > Markus > > > > > > > > > > > > > > =========== =========== =========== =========== > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message lycomingengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/LycomingEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/lycomingengines-list Browse Digests http://www.matronics.com/digest/lycomingengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.