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05-23-2013, 08:05 PM
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Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
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For those who had sensor failures what was the indication: zero pressure? Fluctuations? Oil leak?
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05-23-2013, 08:06 PM
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Join Date: Aug 2009
Location: Redding,Ca
Posts: 633
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Don't recall
Quote:
Originally Posted by RFSchaller
Tim
I still have the engine mounted sender. You mentioned a failure of a sensor. Was it a Honeywell or one of the older types that looks like a small can? Intuitively the Honeywell seems to have a smaller moment arm and should be less susceptible.
Rich
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Sorry I don't recall. As I said this was an automotive application (fire engines), likely they were Cole Hersy or Stewart Warrner. And the failure mode being discussed here is different, these were breaking off, usually only after extended pump ops.
Tim
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05-23-2013, 08:20 PM
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Join Date: Jan 2013
Location: Shingle Springs, CA
Posts: 57
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Quote:
Originally Posted by RFSchaller
For those who had sensor failures what was the indication: zero pressure? Fluctuations? Oil leak?
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Erratic oil pressure readings, usually steady for a while then will start to "hunt" +or- 20 psi or so.
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05-23-2013, 08:22 PM
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Join Date: Jan 2013
Location: Shingle Springs, CA
Posts: 57
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Sensor
Quote:
Originally Posted by tim2542
Sorry I don't recall. As I said this was an automotive application (fire engines), likely they were Cole Hersy or Stewart Warrner. And the failure mode being discussed here is different, these were breaking off, usually only after extended pump ops.
Tim
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All my failures have been with the earlier VDO type sensors, don't have any experience with the Honneywells.
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05-23-2013, 08:35 PM
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Join Date: Mar 2008
Location: Milan, Illinois
Posts: 130
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Oil Pressure Sensor
"For those who had sensor failures what was the indication: zero pressure? Fluctuations? Oil leak?"
I was flying along with my 20 hour RV12, on my way to the paint shop and really into checking out displays with the Dynon ADS-B I had just installed. Received a warning over the headphones - "oil pressure low" or words to that effect. Went over to the Skyview engine screen and oil pressure was in the 17 - 20 pounds range. I backed off power, oil pressure went back up. Put power back in, oil pressure OK for a minute or so, then back to the teens.
Nearest airport was "on the way" so I continued. Oil pressure reading varied from normal to almost zero for a few minutes with more and more time near zero. Everything else normal with engine. I decided it was just the sensor and continued to destination. Eventually Skyview displayed a red X instead of the oil pressure reading.
I never did dig through the menu enough to shut off the oral warning. I did find that the RV12 audio overrides the Skyview warning with regular radio reception. So I was able to get some "peace" by tuning an ATIS that was close enough to hear.
There happened to be a Rotax dealer at the airport with the paint shop. I am having them replace the sender with the new sender Rotax is using in place of the Honeywell. Hope to pick up the plane with new paint and oil pressure sensor next week.
__________________
Keith Williams
Milan, IL
Built RV6 #756, 1989-99, flew until selling 5/2016.
Built RV12 #533, 5/2011 to 11/2012, flying
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05-23-2013, 09:56 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Keith Williams
"For those who had sensor failures what was the indication: zero pressure? Fluctuations? Oil leak?"
I was flying along with my 20 hour RV12, on my way to the paint shop and really into checking out displays with the Dynon ADS-B I had just installed. Received a warning over the headphones - "oil pressure low" or words to that effect. Went over to the Skyview engine screen and oil pressure was in the 17 - 20 pounds range. I backed off power, oil pressure went back up. Put power back in, oil pressure OK for a minute or so, then back to the teens.
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These same symptoms have been caused by a connection that becomes intermittent (often at the spade connectors in the harness) Troubleshooting for a possible wiring problem should always come before just replacing the sensor.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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05-23-2013, 10:37 PM
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Join Date: Mar 2008
Location: Milan, Illinois
Posts: 130
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Sensor
Good point Scott. If I had the plane at home I would be trying that. The Rotax dealer said he expects it is the sensor. He said he has a test for it.
__________________
Keith Williams
Milan, IL
Built RV6 #756, 1989-99, flew until selling 5/2016.
Built RV12 #533, 5/2011 to 11/2012, flying
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05-24-2013, 04:42 AM
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Join Date: Nov 2011
Location: Cheshire, UK
Posts: 10
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Oil pressure sensor failure
To add our experience of failed sensors, our first engine mounted Honeywell sensor failed after 29 hours and the second after 19 hours. We mounted the our third sensor remotely and this has clocked up around 80 hours and hopefully still going strong. Failure mode was zero pressure indication.
Alan
G-CGVD
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05-24-2013, 06:55 AM
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Join Date: Dec 2012
Location: Pentwater, MI
Posts: 17
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A couple of thoughts:
- Is the fluctuation seen with the engine mounted sensors correct? That is, does the ACTUAL oil pressure vary as indicated?
- Do you "bleed" the oil line to the remote sensor location? If not, it is unlikely the line ever fills with oil - and air is a compressible fluid! If this is the case, it is possible that the fluctuations are damped out by the air in the oil line. If the line was bled to contain only oil (an in-compressible fluid) it is possible that the fluctuations would re-appear!
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05-24-2013, 07:55 AM
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Join Date: Nov 2005
Location: Zeeland, Michigan
Posts: 398
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Failure mode
On all 3 failures the pressure indication went to zero.
All wiring connections were fine and the Pulsar was very smooth running. The prop was dynamically balanced and carbs were synchronized.
Gary
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