Sleepwalker
Contributing Member
I have a closed system cooling on my V-6. Running on the trailer I have the sea water intake closed and run the freshwater hose into the strainer. I run it at the recommended up to 1200 rpm. When warming up I can see the temp gauge go up and then see the thermostat kick in. Using the gun I get a pretty steady 160d at the thermostat. (hose water temp here is probably in the 60's now) It has been running like this pretty regularly. When I launched today and ran off the raw seawater, idling at the dock same rpms (seawater also in the 60's), the temp hit 160 and kept climbing. I panicked at about 185 by the gun and shut her down. Hauled home, had lunch and hooked up the hose to run again and see what would happen. Temp climbed to 160 and stayed there. Ran it 20 minutes like that. I checked the strainer for any blockage/growth. I ran a snake down the line to the valve. I also back flushed thru the strainer, and got pretty clear water. Didn't feel anything going up into the valve either thru the hull strainer. I normally keep the raw water valve closed on the mooring, so the only fouling would be from the closed valve to the hull strainer. Any thoughts on why it would run normal on the trailer and hot off the seawater. Heat exchanger maybe? If so, why would the fresh water be different than the seawater, I would think it would overheat on either if there was a problem there.
Thanks, Rich
Thanks, Rich