Re: 1957 Johnson 35Hp Seahorse oil discharge in water

[amuller]

Motors up until sometime in the 60s usually had crankcase drains that went directly into the water. Later on, under some pressure from EPA, they were set up to recycle that drainage. If you poke around on this board you can find discussions of how to divert the drain mixture into a catch bottle or back into the tank. IMO, this is worth doing if you plan to use the motor extensively. It won’t eliminate all the smoke and oil sheen, but will reduce it noticeably. Combine this with modern high-quality oils and you have a cleaner motor.