High Oil Pressure

Doug Rohrer · #1 10-03-2011, 08:33 PM

My RV-9A with an O-320 has always had relatively high oil pressure, 70-80 psi. Lately, I am seeing redline pressure (90 psi) on climb out and full power cruise. I have to cut back 200 rpm to drop the pressure below redline. The problem will only get worse with cooler weather. How do I reduce oil pressure? I did not build this plane. Oil is Aeroshell 20W50.

Mile High Relic · #2 10-03-2011, 09:22 PM

Watch this webinar replay, which is titled All About Oil.

http://www.eaavideo.org/video.aspx?v=1149666747001

It will make you want to switch oil, but I think Mike Busch might also talk about adjusting oil pressure.

gasman · #3 10-04-2011, 01:41 AM

First, test your oil pressure gauge to confirm that it is correct.

Oil pressure is easy to adjust. Check with a local mechanic, or Lycoming overhaul manual.