The crank seals in one of my Toro 4.5 hp suzukis are shot. Right now these machines don't see much use but I have plans for them in the future. I was thinking of just R & R the engine with a new 5hp 2 cycle Tecumseh. The engine is $180 with freight included. Then over the winter I was going to buy a shop manual for that engine (suzuki)and install new crank seals and piston rings. Now I will have a spare engine on the shelf for future usage.