Installing NFB Steering Helm

[phester]

skools ,gotta welding question for ya..my buddy has got a 92[?] 115 yammi, great motor except for a crack that has developed on the lower unit. Right where the front of the prop meets the lower unit, at about a 10:00 position, a crack started last year and now has moved at least an inch and1/4 foward. I think it's passing a little exhaust thru the crack because last time out on it I said it sounded different. Can something like that be welded or marine texed or JB 'd ?? Whattaya think???