Engine alarm-gctid818620

[Guest]

Hi BoC

I have a Bayliner 285 from 2005, in super condition.

Last year I had the engine alarm a few times, and was told that it could be the impellers that had to be changed.

This spring I had the engine gone through by a Mercury technician, who among others changed the impellers, filters, oil and so on.

I thought that this would be the end of my engine alarms, but last week I had it again. I shut the engine off immediately, and let I cool down for 10 minutes. Then I could continue my journey.

The alarm normally goes off when the engine is overheating, but it was not a hot day, and I was only doing cruising speed.

Can anyone help me? What can be the reason for the alarm?

[Guest]

may be same issue I dealt with, the temp switch. Not the temperature sender, which goes to the gauge, but the overheat alarm switch. Mine was sounding randomly, had to use process of elimination since there are 3 alarm sensors on my motor (probably your's too), one for oil, one for drive fluid container level, and other for overheat. But since yours sounded the overheat alarm, I would start there. Disconnect it next time out and be sure to monitor the engine temp by gauge, (assuming it is working properly) and if you get no alarm, you've found it. It is located on the port side of the thermostat housing on my motor, plug on connector so it is easy to connect and disconnect.

Good luck

[Guest]

Thank you Trode.

I will look for the sensor. I can see in the Mercury manual for technicians that they recommend changing the sensor if the engine overheats repeatedly without reason.

Now I just have to find it :-)

[Guest]

Does the engine actually overheat? We have a 99 model 2855 with a 495mag and Bravo 3 drive. Yours might be a 350mpi and Bravo 3? Did the merc guy service the leg as well ie strip it apart and clear any marine growth from the intake passages?

Also did he check the heat exchanger tubes?

[Pcpete]

On my prior boat one engine would give a random alarm. Just enough to make me look, less than one second. Drove me nuts for a while. It turned out to be the oil pressure alarm switch located by the distributor.

[Ruffryder]

engine overheating from Bravoitis...

BTW it's a SWITCH.

[Guest]

I can't find any evidence of the engine actually overheating, only the alarm.

My engine is a 350mpi with a bravo3 drive.

[Ruffryder]

this is why I SUGGEST EVERYONE to fill out their profile sig!

MPI engines are totally different ball game... yes you have many sensors on that 350 MPI.

you are gonna need get that baby scanned, the beauty of owning an EFI engine.