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Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10799
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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1993 nissan 90 hp outboard. Temp alarm rings when i put the

Customer Question

1993 nissan 90 hp outboard. Temp alarm rings when i put the motor in gear, either forward or reverse. Alarm stops at 2000 rpm, just replaced the water pump, pumping a steady stream out the pee pipe, alarm doesn't sound in neutral
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello. My name is Tan.

Is the engine over heating?

Customer: replied 1 year ago.
Not overheating
pumping plenty of water
alarm only sounds when motor is in gear
does not sound in neutral
alarm stops when engine is reed up
Expert:  Tan replied 1 year ago.

Check the wiring see if the wires are caught up in the linkage. Grab the wires and move them around with engine running in gear. Sounds like you have a short somewhere. Can you disconnect the wire at the temp sensor just to eliminate the temp sensor as a possible issue.

Customer: replied 1 year ago.
Linkage was the first thing i thought of
checked the wires for naked spots
found none
Expert:  Tan replied 1 year ago.

Can you disconnect the wire at the temp sensor just to eliminate the temp sensor as a possible issue?

Customer: replied 1 year ago.
I disconnected the alarm
is there a temp sending unit
Expert:  Tan replied 1 year ago.

Did you change the thermostat?

The temp sensor is at the top of the cylinder head. Just unplug it. Does alarm quit?

Customer: replied 1 year ago.
Will try that after work
thanks
Expert:  Tan replied 1 year ago.

Your welcome.. Keep me posted.....Thank you..........Tan

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