I have a '96 Mercruiser 5.7 in front of an Alpha Gen. II. It's a raw water cooled system and I replaced the impeller last spring. It ran fine all last season at around 160 deg. When winterizing it last fall I failed to notice that some jagweed in the shop put the hose on the hot water faucet. The engine got up to around 200 deg. b4 I shut it down! The water burnt the heck out of my arm pulling the riser plugs to drain the engine. Not knowing about the hot water situation and being a tad chilly outside, I pulled the t-stat and put it away for the winter (after my normal winterizing procedures). I installed a new thermostat in it yesterday and started her up. The gauge registered nothing for a few minutes and then shot up to 180 and climbing. I shut it down @ 195 deg.
All 4 hoses on the t-stat housing were VERY hot and the risers were as well- I don't have a thermometer (yet) but they were MUCH hotter than usual. There was steam coming out of the prob hub but COLD water coming out of the transom vents??
Did I get a bad t-stat? And where does the transom outlet water come from? It certainly was't circulating thru the engine!! I have a manual (SELOC) but the cooling schematic stops after the risers.
Thanks for any advice you can give!
All 4 hoses on the t-stat housing were VERY hot and the risers were as well- I don't have a thermometer (yet) but they were MUCH hotter than usual. There was steam coming out of the prob hub but COLD water coming out of the transom vents??
Did I get a bad t-stat? And where does the transom outlet water come from? It certainly was't circulating thru the engine!! I have a manual (SELOC) but the cooling schematic stops after the risers.
Thanks for any advice you can give!
