The V6 GM engine fiited to the Clark CMP40 had the same problem. There is a new bracket which secures the back of the starter. The engine mount has to be cut and the new bracket is bolted in the space where the the engine mount was cut. The outer bolt securing the starter is replaced with a longer bolt. The engine case has to be drilled out and the top surface ground flat to accomodate a nut. You may have to grind a flat on the nut to make it fit. This assumes that the casing is not broke off. Even if the casing is cracked you can do the above fix without the need to weld.