I've been having a problem with my oil pressure relief valve (Titan XIO 360 with 140 hrs TT). I had been running 45 psi in cruise flight and attempts to raise the oil pressure with the PRV (pressure relief valve) adjustments were not successful. Removed the PRV and cleaned the seat, spring and ball. Re assembled and still no increase in cruise pressure, however cold starts (85 degrees ambient temperature) produced 55 psi at idle and 75 at engine runup to 1700 and 100 degrees oil temp. So, I suspected a weak spring in the PRV which weakened with oil temperature rise to 185*. (All of my EMS temp and pressure values have been verified with mechanical gauges.) and I tightened it to within 2 or 3 threads of full travel. Flew to my destination still looking at 45psi oil pressure.
But today on my return trip, after takeoff and during climb to altitude, the oil pressure pegged at 99 psi on my Dynon D-100 and oil temperature rose to 210* resulting in a nervous turn back to the airport. Oil pressure came back down to about 80 psi at idle. I have never seen these high values before and that pretty well shoots down my weak spring theory and obviously the PRV kicked in with overkill.
So, I guess I need to bite the bullet and order a new Oil pressure relief valve since mine seems to have gone "nuts". Other ideas? Comments? Thanks
But today on my return trip, after takeoff and during climb to altitude, the oil pressure pegged at 99 psi on my Dynon D-100 and oil temperature rose to 210* resulting in a nervous turn back to the airport. Oil pressure came back down to about 80 psi at idle. I have never seen these high values before and that pretty well shoots down my weak spring theory and obviously the PRV kicked in with overkill.
So, I guess I need to bite the bullet and order a new Oil pressure relief valve since mine seems to have gone "nuts". Other ideas? Comments? Thanks
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