Nissan 25hp NS25C3 warning buzzer not operational

[csmoczygemba]

Can someone share the details with me on how the warning buzzer is supposed to work? I would expect a short alert when the motor is switched on but I get nothing. Can you confirm that the 98 model has an actual buzzer?

 

[dwco5051]

My 1987 has no warning buzzer, I believe yours would not either.

 

[csmoczygemba]

My 1987 has no warning buzzer, I believe yours would not either.

it appears that some have it, some don't. going to open up my remote box to look. I tend to run with the motor jacked up high and that warning buzzer saves me when the engine gets warm.

 

[csmoczygemba]

looks like an ez retrofit.....yellow and red wire hookup. my motor does appear to have a temp sensor on it as a sending unit is actually there. Assume that wire goes somewhere.

 

[dwco5051]

it appears that some have it, some don't. going to open up my remote box to look. I tend to run with the motor jacked up high and that warning buzzer saves me when the engine gets warm.

My old eyes read 1990 model, not 98. I am sure that one of the Nissan/Tohatsu wizards on this forum will have the right answer. I wonder if I could add a sensor to my old 1987 model.

 

[csmoczygemba]

My old eyes read 1990 model, not 98. I am sure that one of the Nissan/Tohatsu wizards on this forum will have the right answer. I wonder if I could add a sensor to my old 1987 model.

very well...thanks.

 

[Sea Rider]

If it's an M25-C2 motor or previous versions doesn't have a temp sensor located nowhere on the powerhead. TS are usually found on way larger 2 stroke motors. Out of curiosity why do you run said motor jacked high, any advantage runing so ?

Happy Boating​

 

[csmoczygemba]

If it's an M25-C2 motor or previous versions doesn't have a temp sensor located nowhere on the powerhead. TS are usually found on way larger 2 stroke motors. Out of curiosity why do you run said motor jacked high, any advantage runing so ?

Happy Boating​

I will run the motor high when I am in running in less than a foot of water. At times, a motor can loose cooling efficiency when it is up to high and is not getting a full stream. So far though, this little Nissan has been a tank and has not been a problem but I would hate to blow it up without a temp indicators. Take a look at the attached picture. The top red arrow points to the sending unit that is connected to my temp sensor. What is the other one for?

 

[Sea Rider]

A picture says it all. First time seeing such, it's not even mentioned in the parts nor service manual. This is a standard M25-30C3 motor as factory delivered.​

If comes in contact with the lower cylinder head could be a temp sensor installed by someone as an addition to trigger an alarm. This motor can overheat real fast if running continually in low water level at speed in a very short period of time. When the alarm triggers the motor will be already overheated as doesn't count with a heat sensor that will slow the rpm down as a protection.

Happy Boating​

 

[csmoczygemba]

yeah that is weird. I have a temp sensor mounted and it is attached to the upper sensor, not sure where the lower sensor goes. I am going to tear into the remote box next to see if there is actually a buzzer in there and if I get continuity from that sensor in the rear, to that buzzer somehow. it would be great if this was already setup.