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skyking1107(at)yahoo.com
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 Posted: Sun Feb 20, 2011 7:56 pm Post subject: Oil Temp Question |
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I have a 1981 Yak 50 with about 188 hours TTSN Airframe and about 150 hours TTSN on the engine. Since I have owned the aircraft the oil temp gauge has read on the high side. I have replaced the oil temp probe and changed out the gauge with the same result. It seems as though the high reading is from some unknown source. Fortunately I have access to two other Yak 50's and two yak 52's based at my airport. A few days ago I took ambient readings from each of the oil temp gauges in each aircraft as well as the ASOS from the airport. The following are the readings: ASOS 23C, My Yak 50 40C, Yak 52 #1 Front 21C, Rear 20C, Yak 52 #2 Front 21C, Rear 21C, Yak 50 #2 25C, Yak 50 #3 25C. My aircraft's Oil Temp in ambient conditions reads some 15 to 20 degrees C higher than the reference or other similar aircraft.
Can anyone explain why this is or what to do to bring it more in line?
Thanks in advance and best regards,
John
[quote][b]
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dsavarese0812(at)bellsout
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| Posted: Sun Feb 20, 2011 8:07 pm Post subject: Oil Temp Question |
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Sounds like you may have an oil cooler issue John. If the vernatherm is
stuck in by-pass, no oil would pass through the oil cooler fins. Thus
the higher oil temps.
Dennis
On 2/20/2011 9:53 PM, John Sykes wrote:
| Quote: | I have a 1981 Yak 50 with about 188 hours TTSN Airframe and about 150
hours TTSN on the engine. Since I have owned the aircraft the oil temp
gauge has read on the high side. I have replaced the oil temp probe and
changed out the gauge with the same result. It seems as though the high
reading is from some unknown source. Fortunately I have access to two
other Yak 50's and two yak 52's based at my airport. A few days ago I
took ambient readings from each of the oil temp gauges in each aircraft
as well as the ASOS from the airport. The following are the readings:
ASOS 23C, My Yak 50 40C, Yak 52 #1 Front 21C, Rear 20C, Yak 52 #2 Front
21C, Rear 21C, Yak 50 #2 25C, Yak 50 #3 25C. My aircraft's Oil Temp in
ambient conditions reads some 15 to 20 degrees C higher than the
reference or other similar aircraft.
Can anyone explain why this is or what to do to bring it more in line?
Thanks in advance and best regards,
John
*
*
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Feb 20, 2011 8:13 pm Post subject: Oil Temp Question |
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Defective sender or gauge, one would think with an outside chance of defective wiring or connectors. There may be calibration of the gauge, which I assume is the usual triple gauge in Yaks. If this were CHT, the circuit has a sensitivity to the exact length of the harness and uses wire of a particular metal, I forget which. IN that case, you can't alter the wire length or it will skew the reading. Having said this, I think the oil pressure sender is a variable resister and requires power to register. I would take readings at both the sender (resistance), and at the gauge (voltage) and see where the deviation is.
On Feb 20, 2011, at 10:53 PM, John Sykes wrote:
[quote]I have a 1981 Yak 50 with about 188 hours TTSN Airframe and about 150 hours TTSN on the engine. Since I have owned the aircraft the oil temp gauge has read on the high side. I have replaced the oil temp probe and changed out the gauge with the same result. It seems as though the high reading is from some unknown source. Fortunately I have access to two other Yak 50's and two yak 52's based at my airport. A few days ago I took ambient readings from each of the oil temp gauges in each aircraft as well as the ASOS from the airport. The following are the readings: ASOS 23C, My Yak 50 40C, Yak 52 #1 Front 21C, Rear 20C, Yak 52 #2 Front 21C, Rear 21C, Yak 50 #2 25C, Yak 50 #3 25C. My aircraft's Oil Temp in ambient conditions reads some 15 to 20 degrees C higher than the reference or other similar aircraft.
Can anyone explain why this is or what to do to bring it more in line?
Thanks in advance and best regards,
John
| Quote: |
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[b]
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Feb 20, 2011 8:14 pm Post subject: Oil Temp Question |
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Yeah, but his ambient temp is wrong, right?
On Feb 20, 2011, at 11:04 PM, A. Dennis Savarese wrote:
| Quote: |
Sounds like you may have an oil cooler issue John. If the vernatherm is stuck in by-pass, no oil would pass through the oil cooler fins. Thus the higher oil temps.
Dennis
On 2/20/2011 9:53 PM, John Sykes wrote:
> I have a 1981 Yak 50 with about 188 hours TTSN Airframe and about 150
> hours TTSN on the engine. Since I have owned the aircraft the oil temp
> gauge has read on the high side. I have replaced the oil temp probe and
> changed out the gauge with the same result. It seems as though the high
> reading is from some unknown source. Fortunately I have access to two
> other Yak 50's and two yak 52's based at my airport. A few days ago I
> took ambient readings from each of the oil temp gauges in each aircraft
> as well as the ASOS from the airport. The following are the readings:
> ASOS 23C, My Yak 50 40C, Yak 52 #1 Front 21C, Rear 20C, Yak 52 #2 Front
> 21C, Rear 21C, Yak 50 #2 25C, Yak 50 #3 25C. My aircraft's Oil Temp in
> ambient conditions reads some 15 to 20 degrees C higher than the
> reference or other similar aircraft.
> Can anyone explain why this is or what to do to bring it more in line?
> Thanks in advance and best regards,
> John
>
> *
>
>
> *
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Feb 20, 2011 8:24 pm Post subject: Oil Temp Question |
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I meant in comparison to the other Yak-50 or 52....
On Feb 20, 2011, at 11:11 PM, Eric Wobschall wrote:
| Quote: | Defective sender or gauge, one would think with an outside chance of defective wiring or connectors. There may be calibration of the gauge, which I assume is the usual triple gauge in Yaks. If this were CHT, the circuit has a sensitivity to the exact length of the harness and uses wire of a particular metal, I forget which. IN that case, you can't alter the wire length or it will skew the reading. Having said this, I think the oil pressure sender is a variable resister and requires power to register. I would take readings at both the sender (resistance), and at the gauge (voltage) and see where the deviation is.
On Feb 20, 2011, at 10:53 PM, John Sykes wrote:
| Quote: | I have a 1981 Yak 50 with about 188 hours TTSN Airframe and about 150 hours TTSN on the engine. Since I have owned the aircraft the oil temp gauge has read on the high side. I have replaced the oil temp probe and changed out the gauge with the same result. It seems as though the high reading is from some unknown source. Fortunately I have access to two other Yak 50's and two yak 52's based at my airport. A few days ago I took ambient readings from each of the oil temp gauges in each aircraft as well as the ASOS from the airport. The following are the readings: ASOS 23C, My Yak 50 40C, Yak 52 #1 Front 21C, Rear 20C, Yak 52 #2 Front 21C, Rear 21C, Yak 50 #2 25C, Yak 50 #3 25C. My aircraft's Oil Temp in ambient conditions reads some 15 to 20 degrees C higher than the reference or other similar aircraft.
Can anyone explain why this is or what to do to bring it more in line?
Thanks in advance and best regards,
John
href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
href="http://forums.matronics.com/">http://forums.matronics.com
href="http://www.matronics.com/contribution">http://www.matronics.com/contribution
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[quote][b]
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