Re: Engine over temp at idle
Water flow may be restricted at the mixing elbow too, but by all means change the impeller first. If you find missing/broken impeller bits, be sure to track them down. If it's FWC they'll likely be at the inlet side of the H/E..
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345 "FastForward"