High oil pressure on 912 ULS

by Rick Hildebrand in 912 / 914 Technical Questions 7 years ago

I have a 912ULS with 90 hours and I use the recommended AeroShell Sport plus 4 and Rotax oil filters. Oil pressure is always around 74 psi + 1 at 5000 to 5500 RPM. I asked my Rotax certified A&P about the high pressure during my 25 hour oil change inspection and he didn't seem concerned. I was hoping after time the pressure would fall within the normal 73 psi or lower range. I have been told my engine may be very tight. Everything else is in the proper range. Any one else experience this? Any thoughts?

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Re: High oil pressure on 912 ULS

by Bill Hertzel » 7 years ago

Bill Hertzel

13 1.95k 7.97k

It shouldn't matter how tight the engine is.
The pressure regulator should be bypassing all oil above ~45psi.
70+ psi should not be seen unless you just started the engine and there is snow on the ground!
Open up the Oil Pressure Regulator next to the Oil Filter and see what is going on.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
Clicking the "Thank You" is Always Appreciated by Everyone.

Thank you said by: Ken Ryan, Rick Hildebrand

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Re: High oil pressure on 912 ULS

by jan kerstens » 7 years ago

jan kerstens

34 131 5

I have the same problem with my 912 uls. Even after one hour of flight with an oil temp of around 90 degrees C it drops down to only 4.9 bar.
Re: opening up the Oil Pressure Regulator. What can I expect to see? Or is it the VDO oil pressure sender?

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Re: High oil pressure on 912 ULS

by Genival Pacheco » 7 years ago

Genival Pacheco

4 87 135

Hi guys,

According to the operator manual page 2-5 the considered normal pressures are:

Oil pressure
Max. 7 bar (102 psi)
Min. 0.8 bar (12 psi) (below 3500 rpm)
Normal 2.0 to 5.0 bar (29-73 psi) (above 3500 rpm)

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Re: High oil pressure on 912 ULS

by Roger Lee » 7 years ago

Roger Lee

127 5.2k 4.78k

Hi Rick,
You would need to put a mechanical gauge in line to see if the 74 was real. It is possible it could be real or the sending unit or the panel instrument. I would be a little surprised if it were real, but it might be. Normal for most folks is 42 - 60 after it is warm.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: High oil pressure on 912 ULS

by jan kerstens » 7 years ago

jan kerstens

34 131 5

The Pressure Regulator consists of a ball with a spring. A better solution is a cone shaped "ball" (less fluctuations). Could this be the reason? Or is there a wear that may result in relative high oil pressure?
The VDO instrument is based on the principle on a sliding contact on a strip (resistive like resistive fuel gauges). They may develop friction such that are stuck. I have decided to replace the VDO sender anyway: cheap and easy to replace.

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High oil pressure on 912 ULS

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