Home › Forum › Ask A Member › 40hp bigtwin gearcase questions and observations › Re: 40hp bigtwin gearcase questions and observations
When I got my 57 35hp Johnson that drain hole was plugged solid. I used a straight piece of 1/32 inch diameter galvanized steel wire in a drill to open it up from the top. When it is open properly after use an oily residue will drain from this hole. Some mistake this drainage for foot leakage but it isn’t. Every now and then I run a piece of thick weed eater string up this hole from the bottom to keep it open. I believe it plugs with silt from the water after a time. Now that I’m running a crankcase drain recovery system on this motor I don’t get an oily drainage but I do get water. If water sitting in this area freezes I’ve heard it can cause real problems. This may be a much overlooked maintenance item on these motors.