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erratic oil temperature indication

 
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Markus



Joined: 08 Jan 2012
Posts: 8
PostPosted: Mon Jul 20, 2015 5:33 am    Post subject: erratic oil temperature indication Reply with quote
Hello all,
 
I recently noticed that the oil temp reading in our Extra became erratic and the indication is jumping between about 160°F and 200°F.
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? I´m suspecting the temp probe right now, but as the plane is more then an hour away from my home, I´d rather get as much suggestions from anyone experienced, before getting lost an endless "trial and error" hunt , chasing the issue.
 
Thanks,
Markus
 

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tim2542(at)sbcglobal.net
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PostPosted: Mon Jul 20, 2015 6:19 am    Post subject: erratic oil temperature indication Reply with quote
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 <feyerabm(at)web.de> wrote:

Subject: erratic oil temperature indication
To: aerobatic-list(at)matronics.com, lycomingengines-list(at)matronics.com
Date: Monday, July 20, 2015, 6:32 AM

--> LycomingEngines-List message
posted by: "Markus Feyerabend" <feyerabm(at)web.de>

Hello all,
 
I recently noticed that the oil temp reading in our Extra
became erratic and the indication is jumping between about
160°F and 200°F.
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? I´m suspecting
the temp probe right now, but as the plane is more then an
hour away from my home, I´d rather get as much suggestions
from anyone experienced, before getting lost an endless
"trial and error" hunt , chasing the issue.
 
Thanks,
Markus
 


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dan.pat.b(at)gmail.com
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PostPosted: Mon Jul 20, 2015 6:46 am    Post subject: erratic oil temperature indication Reply with quote
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 <carl.froehlich(at)verizon.net (carl.froehlich(at)verizon.net)> wrote:
[quote]--> LycomingEngines-List message posted by: Carl Froehlich <carl.froehlich(at)verizon.net (carl.froehlich(at)verizon.net)>

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 <feyerabm(at)web.de (feyerabm(at)web.de)> wrote:
>
> --> LycomingEngines-List message posted by: "Markus Feyerabend" <feyerabm(at)web.de (feyerabm(at)web.de)>
>
> Hello all,
>
> I recently noticed that the oil temp reading in our Extra became erratic and the indication is jumping between about 160°F and 200°F.
> 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? I´m suspecting the temp probe right now, but as the plane is more then an hour away from my home, I´d rather get as much suggestions from anyone experienced, before getting lost an endless "trial and error" hunt , chasing the issue.
>
> Thanks,
> Markus
>
>
>
>
>
>


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