1994 Mercury 200 2.5 offshore overheat alarm at higher speed.

[garbubba]

Thanks guys!

My daughter is in from out of town for a few days so the boats on hold but I'm starting a list.

Thanks for the explanation of the poppet valves Ferm, I didn't understand the purpose.

Have a few more things to check but I'm thinking new thermostats, poppets & a new impeller kit are in my future.

[phatdaddy]

like ferm said, get a water pressure gauge. i'd rather have that than a tach. a new water pump will deliver about 12-14 psi at 4000 rpm's. when mine would fall between 8-10psi, i knew it was time for a new pump.

[steplift20]

So that's what a poppit valve does, mine to the temp hoes way up at slow speed I have to get going to bring gone temp down Thermostats are changed every year impeller is not to old Poppit valve, I did change it about ten years ago Hmm I think I'm due

[garbubba]

I do have a pressure gauge but it's pretty new & I haven't seen it with a new impeller, yet. Therefore I really just use it to double check. It seemed normal, as did the pee stream, I suspect cruded up thermostats and/or poppets, I'll let y'all know.