alarm sounding from throttle box

[jstan1984]

high pitch alarm coming from throttle almost like a smoke detectors pitch. I was just idleing along when it went off any ideas? its a solid beep not intermittent. the boat is a 1989 bass tracker 1800 tournament tf and 115 hp mercury. thanks for any advice

 

[smokeonthewater]

Overheat alarm, low oil level, low oil pressure, etc

Need to know what engine year and model

 

[dwco5051]

Overheat alarm. Check cooling system before engine is damaged. Were you in shallow water right before or when the alarm sounded? Might have sucked sand or muck into pump. When was the water pump impeller last changed.

 

[jstan1984]

its a 1989 mercury 115 hp outboard the oil injector was disabled by last owner i just mix oil in the gas. the water was not that shallow but started out in pretty heavy vegetation. i have no idea when last time water pump was replaced thanks

 

[Silvertip]

Some of the Mercs had an issue with the magnet in the oil tank falling off the float triggering an alarm.

 

[smokeonthewater]

Weeds.... Most likely plugged the intake

"No idea when....." Means absolutely change the impeller NOW..... Many people change em every season.... They should at least be changed every few years.... BTW never run the engine without supplying water to the impeller for even a second... You can damage the impeller almost instantly.

 

[jstan1984]

should i just replace the impeller or entire water pump?

 

[Frank Acampora]

Can't tell until you remove the pump. mercury had a plastic water pump with a stainless liner If the plastic has melted you will need to replace the whole pump, otherwise just replacing the impeller is sufficient.. Mercury ASLO use a stainless pump If your engine has this one then only the impeller need be changed.

 

[jstan1984]

thank you all very much

 

[jstan1984]

changed impeller problem solved thanks everyone!