Hot alarm

[cricket1985]

Anyone have any trouble with hot alarm on Evinrude etec 150? Started having the alarm go off on Sunday. Run for about 5 min and alarm goes off. Power down wait a few seconds all is ok for another 5 min. Any ideas?

[south point]

could be a lot of things. water pump weak or a plugged water jacket or passage, a lean fuel/air mixture condition could cause the motor to get hot. could be a weak temp sensor, too. was the water pump peeing? maybe get a temp reading on the head and see just how hot it's getting?

[cricket1985]

It was peeing. I took it to the shop but wanted some ideas on what it could be. Thanks!

[Jigging15]

Hopefully it's something simple/inexpensive. Water temp can be deadly on a outboard. Running to cold can be as bad on one as running to hot. Need to really make sure to let them warm up before running them at higher rpm's. I have as smartcraft gauge on my Merc so it's easy to tell when it reaches the right temp and thermostat kicks in and cools it back down. Takes about 3 minutes or so in the colder water and air temps to get to 140 and then kick in and take it back to the 130's.

[LSL Angler]

Thanks for the good information.

[Speck]

Cricket, I had a four stroke yamaha that was doing the same thing even after paying a shop to change the water pump. I finally ordered a new water pump kit, took the lower unit off. I took out the thermostat while the lower was off. Then ran a water hose through the stat housing and flushed the water jacket just in case there was something blocking the water flow.
After I installed the new water pump and reinstalled the thermostat, it ran like a top. Never overheated again.

[cricket1985]

Thanks for the tips! Hopefully it is something simple. Worst part is not having my boat for a week and half!