Oil Pressure Needle

Green Hornet · Post by **Green Hornet** » Wed Jul 30, 2008 2:35 pm

Occasionally my oil pressure gage needle vibrates excessively. It remains in the green but it is vibrating. Any inputs as to what the issue is or if it is an issue. Like I said it doesn't do it all the time just periodically.
Thanks in Advance

210TC · Post by **210TC** » Wed Jul 30, 2008 4:30 pm

Do you think the needle is vibrating or the oil pressure is fluctuating?

Green Hornet · Post by **Green Hornet** » Wed Jul 30, 2008 5:10 pm

I think the needle is vibrating because it hovers all around the same point in the green.

210TC · Post by **210TC** » Wed Jul 30, 2008 5:24 pm

It sound like the gauge needs to be replaced, if so, take a look at multi function gauge by EI. We have spoken about these gauges before and the warning lite is valuable. I have not looked lately, but I think you can use one gauge for many functions.
If you ever loose engine oil pressure in flight the chances of you seeing the needle drop before the engine explodes is probably 1 in a 1000. With the idiot lite you can't miss it.

mauleace · Post by **mauleace** » Wed Jul 30, 2008 7:24 pm

I had a regulator and over voltage regulator that were failing. The result was unreliable voltage and lots of spikes. That was causing all kind of other intermittant electrical problems. While you are checking out the oil pressure gauge, get a volt meter and check the voltage. Should be steady from 13.8 V to 14.2.

Also watch the ammeter. If you can see any fluctuation, I would look at changing the regulator. I got a Zeftronics unit with the OVR and light function built in. Voltage is within 1/10th of a volt and the ammeter is steady.

a64pilot · Post by **a64pilot** » Thu Jul 31, 2008 8:20 am

I'm probably confusing airplanes because I bounce back and forth between a half dozen different ones that I maintain, but isn't the oil pressure gauge direct reading? If it is it could either be air in the line or the orifice in the line is too large, or of course a bad gauge.

mauleace · Post by **mauleace** » Sun Aug 03, 2008 1:09 pm

a64pilot wrote:I'm probably confusing airplanes because I bounce back and forth between a half dozen different ones that I maintain, but isn't the oil pressure gauge direct reading? If it is it could either be air in the line or the orifice in the line is too large, or of course a bad gauge.

You are correct, I checked my M5 today and it is a mechanical gauge.

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