I got my boat last week. Took it to the lake, did great. I took it back out 2 days later about 15 minutes in, it overheated. i did not know I was not to start the motor without water. I got home looked it up and found the impeller on raw water pump might have burnt up. I connected the water to muffs, pulled off the pump output hose started boat for about 10 seconds (more than enough time for water to flow thru). water did not. I pulled the pump off and sure enough the impeller was burnt up. I replaced the impeller yesterday and did the same test, and the water was flowing with real good pressure. I connected it all back together. I made sure everything was tight and started it, About 10 or 15 minutes in the temp gauge almost hit 200 so i shut i off. I pulled the t-stat, It looked old with a little rust , But i put it in boiling water and it opened right up... I put everything back and tried it again and same problem.
I forgot to mention i pulled all hoses except to the circulating water pump to clear out rubber impeller parts... also when the motor overheated, I think its called the exhaust bellow. it was smoking lightly with a burnt rubber smell.
I just wanted to see if theres something else i should look at other than clogged hoses, and t-stat . i know the bellow has flappers, Could they some how melt shut causing water not to flow out. Also there is no water flowing out the prop from what i was told thats where the water and exhaust come out... There IS water flowing out the bottom of sterndrive
I forgot to mention i pulled all hoses except to the circulating water pump to clear out rubber impeller parts... also when the motor overheated, I think its called the exhaust bellow. it was smoking lightly with a burnt rubber smell.
I just wanted to see if theres something else i should look at other than clogged hoses, and t-stat . i know the bellow has flappers, Could they some how melt shut causing water not to flow out. Also there is no water flowing out the prop from what i was told thats where the water and exhaust come out... There IS water flowing out the bottom of sterndrive