Today's Message Index:
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1. 02:58 PM - Re: Sudden Oiltemp dropout during climb out (Bill Watson)
2. 05:00 PM - Re: Sudden Oiltemp dropout during climb out (Albert Gardner)
Message 1
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| Subject: | Re: Sudden Oiltemp dropout during climb out |
I've been waiting for this to come up...
I had a similar problem. That is, quick drops and rises of oil
temperature. The high points looked like 'normal' temps. The low
points were just below the recommended threshold, that is it would reads
about 150F.
This has been going on for quite awhile. I swapped out sensors but the
new sensor at first simply showed me the lower temps. For winter
flying, I blocked some of the cooling air to bring the temp up but it
seemed to have little impact. At some point, the temps again started
vacillating between 'normal' and 'low' temps with no discernible
pattern. The vacillations were instantaneous, as in '1 second'.
I never got around to trying to do some calibration testing of the
sensor. Since everything else seemed right and normal, I just ran with
it and removed the cooling air block.
I'm using a GRT engine monitor and sensor. I also have an SD-20
alternator installed on the vacuum pump pad (along with a 40amp main alt).
During my last oil change, I'm staring at the sensor and the wiring and
realize that the generous service loop I have in place for the sensor
could allow the wires to rest up against the SD-20 in flight. Could
that have something to do with the problem? I can't make any sense of
why such a thing would cause such a thing but...
I tightened up the service loop a bit so it now looks like this oil temp
sensor and SD-20 with tighter service loop
<https://www.dropbox.com/s/zcxlvu360lomkur/2014-05-21%2018.25.25.jpg>
I haven't seen anything but 'normal' oil temps since the change with no
jumping around. Observation continues.
Does this sound possible in other installations? This curious builder
wants to know.
On 6/3/2014 5:04 AM, Mike Whisky wrote:
>
> Hello
> I have seen now three times in the last 70h of flight that in long climb outs
the oil temp dropped within a second from 185 down to 150-155 it stays there
and recovers after leveling off most of the time back to normal within a second
or so. I believe that this must be a sensor issue as the oil temp can't change
that quickly. What is bothering me is that it only happens at the end of those
climbs at around d 8k ft. Did anybody come across something similar?
> Regards
> Michael
>
> --------
> RV-10 builder (flying)
> #511
>
>
Message 2
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| Subject: | Sudden Oiltemp dropout during climb out |
I initially had the short occasional drops in oil temp but cured it by
grounding the sensor case.
Albert Gardner
Yuma, AZ
N991RV
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