Thread: "Backup relay" p/n and operation check?

Ended up bypassing it as I needed to remove the regulator from the equation anyway.

Just need to sort the oil pressure warning light now.

I ignored the standard oil pressure switch, as from memory its operation is reverse of normal pressure switches (ie its open circuit with no pressure) and needed the relay to work - which I didn't have.
I fitted a generic oil pressure switch to the tapping in the main oil gallery below the oil cooler, and connected it directly to the light. I think it was 1/8NPT thread but its been a while so can't be sure.

Steve

Thanks- that's good to know. I was thinking I would fit a gauge and not worry about the light.. that way Ill be able to measure high pressure too in the cold winters we have here.

Originally Posted by flagg

Thanks- that's good to know. I was thinking I would fit a gauge and not worry about the light.. that way Ill be able to measure high pressure too in the cold winters we have here.

I'd be more worried about missing the gauge was reading low due to a major oil leak than about the possibility of too high a pressure. Run the correct oil for your conditions and you wont have to worry about pressure being too high.
If you really want to put in a gauge, then fit a tee piece and run a switch for the warning light (or hook it up to some sort of audible alert too).

Steve

Good point. (The high pressure thing comes from flying GA.. Lycoming use oil that almost solidifies over night.)