Universal m35 leak at drain plug
I am not sure which plug you mean but if the motor is fresh water cooled you have some options. Alumiseal is a fine aluminum flake kind of like fish food flakes if you know that stuff. The seal circulates the cooling system and finds the hole and plugs it up sometimes for good. Barsleak is another sealer for cooling systems looks like milk and once shaken very well poured in the cooling fill hole and it circulates and stops the leak. Pepper ya the black stuff you put on food your stomach cant desolve it and the antifreeze cant ether. Pour in about three table spoons and it will sometimes stop a leak, this is better for emergency repairs but it does work. Last but not least get a new expandable plug and presto no leak.I am a fix on the fly kind of guy and allot of the stuff I have done works still some of it has lasted for years and friends tell me you know that gizmo you made is still working. I like to give people good advise and good advise is fix it right the first time you cant over beat the engineers at thier game but once in a while. I have a good avrage of beating them to death but its a tough game.