Oil Pressure Too High - HELP!
Engine - O320D1A 540TTSN
Prop - Fixed Pitch
On a two hour x-country last week, my oil pressure began to climb, reaching nearly 100 psi. I throttle back to prevent going over red line, all other indications normal except fuel pressure, which also showed an increase, to nearly 10psi. Both oil pressure and fuel pressure transducers are on the same (Vans) manifold, which is mounted in the engine compartment, on the firewall.
Gage and transducers are standard Van's, and I replaced the oil gage and transducer on Friday - no change.
I teed in another oil pressure gage just in front of the transducer manifold and see values typically 10-15 pounds below my Vans gage at various power settings.
I've since removed the transducer manifold and cleared all surfaces of anodizing, including the threads. Fittings are steel. Still no change.
I've tried running a ground wire directly from the transducer to the aircraft ground. No change.
Anyone have any thoughts on this? Other than a couple of flat tires and an alternator last year, they plane has been rock solid over the past 500+ hours. This one's got me stumped.