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Old 01-06-2012, 07:11 PM
vmirv8bldr's Avatar
vmirv8bldr vmirv8bldr is offline
Join Date: Jun 2005
Location: Eastvale, CA
Posts: 378
Default No oil pressure

Today I prepared the plane for first engine start and after topping off ht oil and removing the bottom plugs, hand propped several rotations, probably 20, then engaged the starter (plugs still out) hoping to see some pressure. None, zilch. I ran the starter for probably 10-15 seconds. I did this cycle a few times with no joy.

The engine came from Barrett and has run before (90 minutes on the dyno.) It was pickled by them a couple of years ago, dessicant plugs and all that. I added about 7qts of oil and the dipstick reads right at 8 at level flight attitude.

Any suggestions?

Bart Filipiak
Eastvale, CA
RV-8 N74VB

Barrett IO-390
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Old 01-06-2012, 07:15 PM
Ron Lee's Avatar
Ron Lee Ron Lee is offline
Join Date: Jun 2005
Posts: 3,275

Sensor wiring to your indicator to include grounding if required. Assume a simple problem first.

What is your indicator? Separate gauge? EFIS?

Last edited by Ron Lee : 01-06-2012 at 07:24 PM.
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Old 01-06-2012, 07:16 PM
jbagley's Avatar
jbagley jbagley is offline
Join Date: Sep 2009
Location: Aloha, or
Posts: 282

Had the same problem.

My oil pressure indicator wasn't working. I was fortunate to have one of the local mechanics helping; he happened to have a mechanical oil pressure gauge that we could plug in quickly.
James Bagley Jr
RV6A flying
RV6 #2 tail done and wings done
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Old 01-06-2012, 07:26 PM
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frankh frankh is offline
Join Date: Jul 2006
Location: Corvallis Oregon
Posts: 3,547
Default Empty oil filter?

I notice that when i change the oil and spin the motor over with the plugs removed it can take about that long before I get any oil pressure indication.

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Old 01-06-2012, 08:17 PM
N427EF N427EF is offline
Join Date: Oct 2005
Posts: 1,529
Default More time needed.

More like 30 seconds the first time you try to get oil pressure.
You really can't hurt that engine spinning it on the starter without plugs installed. I remember I had the same thoughts a couple of month ago.
It took about 3 tries of more than 10 seconds each to finally register oil pressure about 45 psi . It seems a very long time when you are grinding the starter and normally it would be but with the plugs removed you really are not putting any load on the crankshaft or its bearings.
Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 700 plus hours
Running on E10 mogas
Don't believe everything you know.
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Old 01-06-2012, 08:19 PM
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Ironflight Ironflight is offline
VAF Moderator / Line Boy
Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,548

It's very common to take a good thirty seconds of cranking (no plugs) to get an indication Bart. Remember that you've got air in the lines from the engine to the oil pressure gauge (or transducer, and you've also got an orifice in the fitting coming out of the engine. Common practice is to disconnect the line at the gauge/transducer, and hold the end in a rag while cranking. Once you get oil to that point, attach it to the gauge, and you'll have pressure.
Paul F. Dye
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)
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Old 01-06-2012, 11:59 PM
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skylor skylor is offline
Join Date: Aug 2009
Location: Southern California
Posts: 959

Originally Posted by frankh View Post
I notice that when i change the oil and spin the motor over with the plugs removed it can take about that long before I get any oil pressure indication.

Note that it's perfectly OK and good practice to Pre-fill a new oil filter by hand prior to installing it when changing your oil. Obviously, if you have a standard horizontally mounted filter you don't want to fill it so full that the oil spills when you install it, but you can put a surprising amount of oil in. This helps th OP to come up much faster after an oil change.

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Old 01-07-2012, 12:45 AM
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rv9av8tr rv9av8tr is offline
Join Date: Dec 2006
Location: Portland, OR
Posts: 827

Paul is exactly right..... which is typical 8-)
Long-EZ built 1985 -> Sold 2007
RV-9A; N539RV First Flight: 7/2010
RV-8A N468DL 40 hr Flight Test Program
Building Log:
APRS Tracking:
2017 Paid
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Old 01-07-2012, 12:46 AM
ao.frog ao.frog is offline
Join Date: Sep 2006
Location: Manstad, Norway
Posts: 866

I second Paul's suggestion.

I did the same prior to first start, and it took a surprisingly long time before oil came out of the line.

At first, there was a mix beetween oil and air coming out, but after a few sec's, there was steady oil-flow. After hooking up the line, oilpress-indication was there.

Let us know how it goes.
Regards Alf Olav Frog / Norway
First RV-7 completed, (bought partly finished from a US-builder) 305 hrs per July 2014, SOLD
Second -7 had first flight Feb 25th 2014. 220 hrs pr July 2019. Life is good!

Last edited by ao.frog : 01-07-2012 at 12:49 AM.
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Old 01-07-2012, 05:00 AM
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pierre smith pierre smith is offline
Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,894
Default Yep

A friend of mine is fighting that problem with a Conti IO-520 that had to be disassembled after a prop strike.

After that 2 years of sitting, your oil pump has lost its prime and you can refill it by removing the oil filter and using a funnel and a piece of flexible clear plastic tubing, fill the oil pump from the center of the oil filter hole and turn the prop backwards so the pump gears suck the oil in from that end.

Rv10 Sold
46 years ag pilot/CFI
Air Tractor 502/PT-6
Building RV-12, Wings, fuse, emp complete. FWF in progress.
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