So got a supposed 74 6 hp that was in pretty bad shape when I got it... the t stat was corroded and stuck open and the holes that the t stat controlled were plugged so I pulled the head and cleaned the jackets up good but now there's no water making it to the jacket around cylinders... there's a good mist out the hole in back so assume its pumping water... the tube has come out with the lower the last time I had it off so possibly not getting it lined up right... another question on the bottom crank seal that the o ring fits in should I replaced it if the motor overheated with as bad as it was when I got it??? That's the only part I didn't change out and the bottom seal is still leaking oil...