Oil Pressure

Captain Cape May

Captain Cape May

New Member
Jun 17, 2020
27
Boat Info
Sundancer 260 2005 upgraded Garmin Echomap Plus 93sv
Engines
Single Mercruiser 350 Mag MPI 300 hp
inboard/sterndrive gas engine with Three blade Duoprops
While running our 2005 260 Dancer over the weekend my oil pressure gauge started dropping and it tripped the alarm and cut the propulsion as i came to a slow speed. shortly after the gauge read zero.

I shut off motor and got towed back to my slip just to be safe.

once back at the dock, i located the oil pressure sensor and when i pulled the plug, my gauge shot back up to half at the 50 mark and the alarm shut off.

has anyone had this similar situation ? could it be a bad sensor and a swap could fix this ?

i just had the oil changed 2 weeks ago and there was no oil in the bilge and motor ran fine, even started back up fine
 
Disconnection would do as you describe but doesn't tell if you have an oil pressure problem or a sender problem. you could put a mechanical gauge where the sender screws in. or go buy another sender to test.
 
scoflaw said:
Disconnection would do as you describe but doesn't tell if you have an oil pressure problem or a sender problem. you could put a mechanical gauge where the sender screws in. or go buy another sender to test.
Click to expand...
Thanks for this input. Regarding the mechanical gauge, what should it read ? 240OHM?
 
scoflaw said:
It will read in lbs. not ohm's
Click to expand...
ok, thanks. i'm going to replace the sensor first and will buy the mechanical gauge to test as well - appreciate you guys
 
If you want to be creative, put a "T" in and have both operating. That way you can verify the pressure on the mechanical gauge to the electric one. I do this often for testing and diagnostic purposes
 
guys, if i were to pull out the oil sensor and run the boat, would that be ok? if the motor were not getting oil from a bad oil pump, that thing would be knocking wouldnt it?
 
yeah, forgot to mention that - i would use a mehanical gauge / but otherwise it would be safe correct?
 
thank you
 
something else to look at,,,check the inside of the plug that goes onto the sending unit. many times there is corrosion inside the connector. A small wire brush and tiny screwdriver, and you can clean out the corrosion. apply a small dab of die-electric grease to the connector then push it back on. '06 260 DA here, and I've had to clean all connections in engine compartment just because of a little bit of corrosion. Not a model specific problem, just one that most boats incur because of moisture and mother nature. Hope you find the problem.
 
Great advice thank you
 
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