You didn't say which engine you have , when you change the impeller, change any other rubber parts that are there - i.e. o-rings at the top of driveshaft, rubber bushing in the top of water pump, etc.
thank you sound like sound advice. i just bought this boat used im pretty new at this my other question is how does the oil from the little tank in the bottom of the boat get up to the motor. 1985 115hp johnson outboard. im just learning all this.