Rub your hands dry and you feel the heat.-----Running one of those or any impeller dry for 10 /15 seconds just kills them.-----Found 2 impellers burned on 70 HP motors last year.----Many novice boat owners learning the facts these days !!
The newer 3 cylinder 25 / 35 HP used a 4 blade prop.----It will fit.----Depends on the boat, load and condition of the motor whether it will work for you.
Check gear oil.------Check flexplate on the flywheel.-----Push / pull / lift on the flywheel.----No overheat warning or shut down on that motor.-----Install a new impeller !!
No surprise there.----There are hundreds of boats out there in the same condition.-----Folks just do not know how shoddy / cheap some of the hidden materials are.----Water and heat will destroy plywood.
My project is outdoors so I have to work on good dry days.---I agree if you do it right it will outlast you.----I am doing a 40 year old boat.----No wood in the transom , floor and under the floor.
It takes a lot longer than you think to fix these things.----Working alone or with an assistant ?-----Start with a compression test on the 45 year old motor.---See if it runs properly.----Test the motor on the lake if boat is safe to float.------Be a shame to fix the boat to then find out motor...