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Oil pressure gauge fluctuations

  • bigwally
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4 weeks 19 hours ago #22876 by bigwally
Oil pressure gauge fluctuations was created by bigwally
My 912 ul engine is 2 yrs old and has 225 hours on it. The oil pressure gauge has alway fluctuated 10-15 psi. I recently discounted the oil pressure sending unit and hooked a gauge directly to the engine. The pressure was fine, no fluctuations. The next step I presume is to test the gauge and sending units. Any other suggestions? Also, is there an easy way to test the gauge and sending unit?

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4 weeks 18 hours ago #22877 by garrett
Replied by garrett on topic Oil pressure gauge fluctuations
If the pressure sending unit is engine mounted vibration and heat will damage it.

www.aircraftspruce.com/catalog/inpages/r...php?clickkey=6024154

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4 weeks 18 hours ago #22878 by Bill Hertzel
Replied by Bill Hertzel on topic Oil pressure gauge fluctuations

bigwally wrote: ... The oil pressure gauge has always fluctuated 10-15 psi.

By fluctuating, do you mean it varies with throttle changes; Or do you mean it changes up and down more than once a second?
Is this when the engine is Hot, Cold, Or all the time?

I recently discounted the oil pressure sending unit and hooked a gauge directly to the engine. The pressure was fine, with no fluctuations. The next step I presume is to test the gauge and sending units. Any other suggestions? Also, is there an easy way to test the gauge and sending unit?


What type of gauge did you hook directly to the engine?
Was it fine at the same Temperature and RPM that you normally experience the problem?

The definitive way to test the measuring equipment is to install a "Tee" and monitor both gauges simultaneously.

The best gauge to use is a purely Mechanical Gauge.
It will have the fastest response time and reveal any abnormalities.
Electric gauges of any variety will have difficulty tracking rapidly changing pressures.

Bill Hertzel
Rotax 912is
North Ridgeville, OH, USA
whertzel1@yahoo.com
Clicking the "Thank You" is appreciated by all.

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3 weeks 4 days ago #22911 by bigwally
Replied by bigwally on topic Oil pressure gauge fluctuations
The oil pressure gauge show 10-15 psi swings at cruising setting, 4k rpm. The indicator moves every sec.
I used a analog gauge directly hooked to the engine and it gave a consistent reading.
My engine has an electronic sending unit. I assume it is either the sending unit or gauge that is malfunctioning

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3 weeks 4 days ago #22912 by bigwally
Replied by bigwally on topic Oil pressure gauge fluctuations
My plane is an Air Cam. The engine is mounted on the back of the wing. Its a pusher.
It's probably 20 ft from the engine to the front panel

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