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Sudden Oiltemp dropout during climb out

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jdriggs49(at)msn.com
Guest

Posted: Tue Jun 03, 2014 5:19 am Post subject: Sudden Oiltemp dropout during climb out

It really sounds like a wiring problem involving the sensor. The sensor itself can go out of tolerance or totally go bad but intermittent problems like this is usually always a wire problem. Loose connection or a semi broken wire.

[quote] Subject: Sudden Oiltemp dropout during climb out

 From: rv-10(at)wellenzohn.net

 Date: Tue, 3 Jun 2014 02:04:29 -0700

 To: rv10-list(at)matronics.com

 --> RV10-List message posted by: "Mike Whisky" <rv-10(at)wellenzohn.net>

 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

 --------

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 #511

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dave.saylor.aircrafters(a
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Posted: Tue Jun 03, 2014 6:20 am Post subject: Sudden Oiltemp dropout during climb out

 I had almost the exact same problem.  Replaced the sensor, no help.  Finally I put a dedicated ground from as close to the sensor as possible to the firewall.  That fixed it.  I have a very robust ground from the case to the engine mount, but the OT sensor needed the additional ground.

  

--Dave



 



On Tue, Jun 3, 2014 at 2:04 AM, Mike Whisky <rv-10(at)wellenzohn.net (rv-10(at)wellenzohn.net)> wrote:

[quote]  --> RV10-List message posted by: "Mike Whisky" <rv-10(at)wellenzohn.net (rv-10(at)wellenzohn.net)>

 

 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

 

 

 

 

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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Tue Jun 03, 2014 7:00 am Post subject: Re: Sudden Oiltemp dropout during climb out

Thank you for your replies I will follow your advice and check if it appears again. 



Regards

Michael

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#511

Gordon Anderson

Joined: 16 Apr 2012
Posts: 41
Location: Switzerland

Posted: Tue Jun 03, 2014 8:53 am Post subject: Sudden Oiltemp dropout during climb out

Michael,



3 times in same flight conditions seems a little suspect to pinpoint it as a sensor / electrical issue, although I would certainly follow advice and add the ground to eliminate that possibility.

Having had problems with oil foaming in a previous career, I would wonder if there is a combination of rpm / aircraft attitude / ambient pressure in the climb phase which results in the sensor being in an air or foam pocket rather than having full oil contact, which is then resolved by transition to cruise.  That could potentially falsify the sensor reading but might not be a cause for concern if there is no related change in oil pressure.

Cheers,

Gordon

41015, engine on, baffled 



On Jun 3, 2014, at 4:19 PM, Dave Saylor wrote:

[quote] I had almost the exact same problem.  Replaced the sensor, no help.  Finally I put a dedicated ground from as close to the sensor as possible to the firewall.  That fixed it.  I have a very robust ground from the case to the engine mount, but the OT sensor needed the additional ground.

  

--Dave



 



On Tue, Jun 3, 2014 at 2:04 AM, Mike Whisky <rv-10(at)wellenzohn.net (rv-10(at)wellenzohn.net)> wrote:

 	  Quote: 	
		    --> RV10-List message posted by: "Mike Whisky" <rv-10(at)wellenzohn.net (rv-10(at)wellenzohn.net)>

 

 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

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=424275#424275

 

 

 

 

 Attachments:

 

 http://forums.matronics.com//files/image_480.jpg

 

 

 

 

 ===========

 " target="_blank">http://www.matronics.com/Navigator?RV10-List

 ===========

 MS -

 k">http://forums.matronics.com

 ===========

 e -

           -Matt Dralle, List Admin.

 t="_blank">http://www.matronics.com/contribution

 ===========

 

 

 

 



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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Tue Jun 03, 2014 9:20 am Post subject: Re: Sudden Oiltemp dropout during climb out

Hi Gordon,

thanks for sharing your thoughts I had a similar suspicion. I will now go through my flights and analyze them in Savvyanalysis.com to see if the phenomena occurred really always in a similar attitude, RPM or hight band.

But I have found already one exception so wiring/grounding is currently on top of my list.

Cheers

Michael

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#511

Mauledriver(at)nc.rr.com
Guest

Posted: Thu Jun 05, 2014 1:58 pm Post subject: 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

       

       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:

     

     [quote]        	  Quote: 	
		  --> RV10-List message posted by: "Mike Whisky" <rv-10(at)wellenzohn.net> (rv-10(at)wellenzohn.net)



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





	
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Albert Gardner

Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ

Posted: Thu Jun 05, 2014 4:00 pm Post subject: Sudden Oiltemp dropout during climb out

[quote]I initially had the short occasional drops in oil temp but cured it by grounding the sensor case.Albert GardnerYuma, AZN991RV [b]

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