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  #1  
Old 01-18-2022, 04:57 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,750
Default help troubleshooting unusually high oil pressure

I don't know a ton about oil pressure and, unfortunately, DanH is not my next door neighbor, so I'm hoping someone can point me in the right direction...

I haven't been flying much over the past 5-6 months but did today and noticed my oil pressure was reading higher (and staying higher) than normal. Though it seems to have been trending slightly or gradually higher the last year or so, today was unusually high.
1. Normally at climb or high cruise power once my oil temp gets up to about 180F I tend to see the oil pressure drop off from the high 80s down into the low 80s, then down to the low 70s at economy 65% cruise. I've generally just guessed this was because the vernatherm opens around 180F and lets oil in the cooler.
2. Normally, once I pull power back (from climb power to 65% power or less I will see a signficant reduction in oil pressure--again, down into the low to mid 70s, or even in 60s if I pull power way back.
However, today, at climb, and high cruise (75%+) power, I was tending to see low 90s psi (yellow range starts at 90psi). Even when my oil temp got up to 185F I was still seeing high 80s psi. Reducing to about 65-70% power only reduced oil pressure into the high 80s, and down to about 45% power it was still mid 80s psi.

Details:
0-320-D2A, 600 hours; Kavlico 2-wire pressure sender; Phillips XC20W-50 oil (same as I've always used, year round). No significant engine work in last few hours. OAT=30F. Oil pressure relief valve has been screwed out all the way/nearly all the way ever since it came from Aerosport power so I don't really have any downward adjustment available.

Any suggestions for troubleshooting aside from the "check with another oil pressure gauge"?

Thanks for suggestions on places to start.
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  #2  
Old 01-18-2022, 06:52 PM
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Ironflight Ironflight is offline
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Default

Steve - you told us about the sender....what are you reading the pressure on? EFIS? Dedicated gauge?

Hate to say it, but the first thing to do is figure out if it is instrumentation or actual high pressure - and the easiest way to do that is to try another gauge....

Paul
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  #3  
Old 01-18-2022, 08:57 PM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
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Default

Thanks Paul. Yes, reading sender on D180.
Will work on finding another gauge to confirm present indications.
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  #4  
Old 01-18-2022, 11:47 PM
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Ironflight Ironflight is offline
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BTW- the old VDO senders almost always failed “high”- I’ll be interested to know if the Kavlico does the same thing….
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Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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  #5  
Old 01-19-2022, 11:49 PM
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erich weaver erich weaver is offline
 
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My oil pressure sender has been in use 13 years now and sometimes reads high on my GRT EFIS. A few years back I called GRT about it and to my surprise, they suggested firmly tapping on the outside of the sender several times with a screwdriver to see if that corrected the problem. It did! I’ve used that method several times since. Still sounds hokey, but is still effective to date. Not sure why. Worth a try

Erich
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  #6  
Old 01-20-2022, 02:08 AM
Richard Connell Richard Connell is offline
 
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Location: Sydney Australia
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Quote:
Originally Posted by erich weaver View Post
My oil pressure sender has been in use 13 years now and sometimes reads high on my GRT EFIS. A few years back I called GRT about it and to my surprise, they suggested firmly tapping on the outside of the sender several times with a screwdriver to see if that corrected the problem. It did! Iíve used that method several times since. Still sounds hokey, but is still effective to date. Not sure why. Worth a try

Erich
I have had the same symptomatic failure of these vdo senders.
This is what the last one looked like inside. Worn through. May explain the tapping remedy.

Click image for larger version

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