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Jeff G.
Jeff G., Marine Mechanic
Category: Boat
Satisfied Customers: 4724
Experience:  42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance
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Mercury 25 HP 4 stroke Big Foot 2006 SN 1B294901 Motor went

Customer Question

Mercury 25 HP 4 stroke Big Foot 2006 SN 1B294901 Motor went under water running after Transend on Pontoon Broke. Now engine starts, and runs at low speed, after a few seconds starts beeping every second. Have changed oil filter and plugs. Will run at idle
for long tine does not appear to over heat, Has good water stream.
Submitted: 1 year ago.
Category: Boat
Expert:  Jeff G. replied 1 year ago.
You are getting a low oil pressure alarm. It is possible the sender is bad or the oil pump is damaged.
You need to get a mechanical oil pressure gauge. Put it in place of the oil pressure sender and check the pressure. If the oil gauge doesn't show good pressure almost immediately shut the engine down. At 3000 rpm you want 30 to 40 psi.
If the oil pressure is good replace the sender.

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