Oil Pressure Guage

[Penns Beach]

I have a 2003 2700 SCR with a mercuriser and bravo 3 outdrive. last week the pressure gauge started bouncing. while docked it does not seem to bounce and is holding 40 psi. it does not do this all the time. what should i look at to solve this situation? Thanks! the number on the gauge is Faria DLO474A. If I need the gauge where do you suggest and purchase the exact replacement?

[seapuppy]

check on the side of the engine..i believe it's on the stbd side....the connections may be loose...check the back of the gauge for corrosion...also check the oil levels...if they are low..that could cause it....


SP

[ss3964spd]

First question - since you did not mention, have you verified there is the correct amount of oil in the engine via the dip stick?

The oil pressure gauge is electrical (opposed to having an actual oil line going to the back of the gauge). There is an OP sender screwed into the engine, a single wire attached to the sender which terminates at the back of the gauge. If the engine has the correct amount of oil in the pan I would check that the wire is not grounding on anything, and also ensure the wires on the bac of the gauge are tight and not corroded. If it looks fine then replace the OP sender on the engine.

If none of that works I'd be inclined to hook up a temp OP gauge to prove, or disprove, the helm mounted gauge. If the temp gauge is stable - it's the gauge. If it isn't then it's possible that the oil pick up tube for the oil pump has fallen off (yes, it does happen).

Most likely though it's the OP sender on the engine.

Dan

[Penns Beach]

Thank you all for your response. The oil level is right and the OK line and clear. I will check all of the above.