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Oil Pressure sensor.

Posted: Tue Nov 17, 2020 6:17 pm
by wschneid
The starboard engine on my 32' FB with Chrysler 318's gets pegged to the right when I start the engine. Could this be a sign of a faulty oil pressure sensor? And where is the sensor located on that engine? The engine runs fine, but the oil pressure showing that high concerns me.

Bill Schneider

Re: Oil Pressure sensor.

Posted: Wed Nov 18, 2020 6:45 am
by Fastjeff
That might be an accurate oil pressure reading if the relief valve in the oil pump is stuck closed.

I would stick a second oil pressure gage on it temporarily and see if that gage went way up as well.


PS: If I'm righ you should change the oil immediately.

Re: Oil Pressure sensor.

Posted: Wed Nov 18, 2020 7:41 am
by bcassedy
The location of the oil pressure switch is at the rear of the engine. Back in 2018 I was going to switch to an electronic gas pump. Part of the process requires an oil pressure switch be electrically in line to the pump so that, if the engine should die (or just the ignition be left energized - engine not running) the oil pressure switch would open, breaking the circuit to the gas pump (and preventing a flood of gas spewing from the carb - bad thing! :roll: ). This is a pic of the "stack" of pressure switches. Your original one would be first (second?). The 3rd (top - canister) is the one I added - but ultimately didn't need as I located a source for the mechanical pump and used that.
Strbrd oil pressure swtch stack - 50% of 25%.jpg

Note - I did try removing the original switch but it seemed I'd foul up the threading / break off the original switch in the process. Opted to just "stack" the new one, which has worked well (it's just sitting there, not being used - the engine, other oil switches below, and gauge don't seem to care.

Re: Oil Pressure sensor.

Posted: Wed Nov 18, 2020 12:52 pm
by jralbert
In this discussion of oil press switches one thing to add. They are failure prone. Oil will shoot out. Maybe it's vibration - I don't know. Check them often and have a spare or two on hand. If one were to let go on a trip, you'd lose vital oil quickly. Which is why one monitors oil press and temp and have a temp alarm.

Re: Oil Pressure sensor.

Posted: Fri Nov 20, 2020 7:31 am
by ddependo
Good point, to have a couple of spares. Anyone have the part # for 318 engines?
Thanks, Wayne

Re: Oil Pressure sensor.

Posted: Sun Nov 22, 2020 4:59 am
by Tuggle
Check your ground, inspect the wire, clean the terminals.