Merc high temp alarm?

[dbetterred]

I looked up the poppet valve and that made sense with the overheat symptoms. I pulled it off and it looks good. Disasembled and cleaned it and will reinstall when I get gaskets. I won't know for sure until I run it but that doesn't look like the problem.

Looks like I'm pulling the lower unit back off.

ordered t-stats also.

[dbetterred]

I may not have to pull lower off after all.
Pulled thermostats out (broke one bolt...) and they were super crusty and rusty!
Looks like this may have been the problem. Fingers crossed!