I don't think JB would work given the crack ran around the entire lower case. Welding it worked for me, at least on this small 2 hp outboard. I'll take it apart after a few hours to inspect it. The weld is hidden under the clamp that holds the motor to the transom clamp.Winkfish said:What about using JB Weld? I've never used it for something like this, but they say it is used successfully on things like cracked engine blocks.