I just bought a 1966 Johnson 60 horsepower motor. I do not know much about motors. I got it to start but noticed smoke coming out of the water.(Trash can filled with water) I removed the propeller and found a creamy, foamy liquid behind propeller. I think it is water and oil getting into this area. Can any one give me advice on what the problem might be, and how much it will cost to repair? Any info will be appreciated.