Apparatus for repairing lower units

A combination of parts for repairing a motorboat lower unit having worn screw threads, comprising:

• cutting means for removing a predetermined length of a cylindrical trailing end of a lower unit housing, said lower unit housing tapering downwardly from said cylindrical trailing end to a closed leading end and said cylindrical trailing end having a plurality of circular cavitation grooves and worn screw threads formed therein;
• a cylindrical replacement part having a predetermined length and having a plurality of circular cavitation grooves and screw threads preformed therein, said predetermined length of said cylindrical replacement part being equal to the predetermined length of said cylindrical trailing end of said lower unit housing that is removed;
• an alignment tool for aligning said cylindrical replacement part relative to said lower unit housing;
• attachment means for securing said cylindrical replacement part to said lower unit housing;
• and
• said alignment tool having a leading end that tapers downwardly so that it is ensleevable within said lower unit housing, a uniform diameter central part having a length substantially equal to the predetermined length of said cylindrical replacement part so that it is ensleevable within said cylindrical replacement part, and a trailing part having a diameter greater than a diameter of said uniform diameter central part so that it abuts a trailing edge of said cylindrical replacement part and retains it against movement when said attachment means is used to attach said replacement part to said lower unit housing.