Oil pressure reading high

I find the oil pressure of my '78 911SC reads too high. I just replaced the sensor and verified that the part number is correct.

When hot the oil pressure is 5 bar at 2500rpm. What gives?

The sensor reads 13ohms when the engine is stoped. When idling cool with a pressure of 2 bar the sensor reads 71 Ohms.

Can someone measure the resistance of his sensor stoped and idling? You'll have too remove the wire to make the measurement.

Thanks,

Tony

There are 2 different pressure sensors, one does read twice the other.

This is what I though, but the part # is 911-606-111-01 which matches what Pelican parts has for the '78 911SC.

I think maybe the gauge needs calibrating, but I'd like to verify the actual oil pressure before I start tinkering with the oil pressure gauge.

Originally posted by Bill Verburg:
There are 2 different pressure sensors, one does read twice the other.

Could be your bypass may have some trash in it. Just in front of the rear wheel on the passanger side is the bypass for the trombone oil cooler which is in font of the passenger side front tire.

To check this, run the engine until hot, then reach under and grab it. If it's hot, then it's working. If it's not hot, then you need to disassemble it and may have to install another regulator.

The bypass has a orfice in it which allows oil to return back to the tank. The nut on the bottom has a spring behind it which controls the return pressure. Just remember when you remove it, oil will come out.

There is also another spring under the engine which is the pressure relief for the pump, but I don't think this is where your problem is.

Steve