I have a 1993 5.0 ford.omc. I
I have a 1993 5.0 ford.omc. I had the moter rebuilt 2 yrs ago. Including new exaust manifolds. New impeller and waterpump on moter. On the 19 ft. boat it will do 40mph+ It runs great EXCEPT it will overheat at slow speeds (no wake zones) At idle speed. When I get a chance to open it up the temp gauge will drop almost instantly. Any speed from aprox 8mph and faster the temp will stay in the safe range (175-225) I replaced the thermostat with no change. More than once I have shut down or stalled during the over heating stage and I had to sit in the water for about an hour to let things cool before I could get underway again. I seem to have good water flow at home with the garden hose. I can run all day in idle speed at home hooked up to the hose but as soon as I put it in the water in gear at idle speed I have about 5 min before every thing over heats.
I have a 1993 5.0 ford.omc. I had the moter rebuilt 2 yrs ago. Including new exaust manifolds. New impeller and waterpump on moter. On the 19 ft. boat it will do 40mph+ It runs great EXCEPT it will overheat at slow speeds (no wake zones) At idle speed. When I get a chance to open it up the temp gauge will drop almost instantly. Any speed from aprox 8mph and faster the temp will stay in the safe range (175-225) I replaced the thermostat with no change. More than once I have shut down or stalled during the over heating stage and I had to sit in the water for about an hour to let things cool before I could get underway again. I seem to have good water flow at home with the garden hose. I can run all day in idle speed at home hooked up to the hose but as soon as I put it in the water in gear at idle speed I have about 5 min before every thing over heats.