Piston pin lock ring insertion tool and method

A piston-pin lock-ring-insertion tool comprising:

• a ring-insertion tube in working relationship to a ring pusher for inserting a lock ring into a lock-ring groove in a piston-pin bore of a selected piston;
• the ring-insertion tube having a ring-feeder end that is oppositely disposed from a ring-insertion end;
• the ring-insertion tube having an inside periphery with a press-close taper that is internal and tapered inwardly from the ring-feeder end to a ring-guide bore;
• the ring-guide bore having an inside periphery that is cylindrical uniformly intermediate the press-close taper and a ring-insertion end of the ring-guide bore;
• the press-close taper and the ring-guide bore having axes that are concentric;
• the ring-guide bore having an inside periphery that is adapted for sliding contact of an outside periphery of the lock ring in a pressed-close mode from the press-close taper for being slid into an inside periphery of the piston-pin bore;
• the ring-insertion end of the ring-insertion tube having a perpendicularity surface that is perpendicular to the axes of the press-close taper and the ring-guide bore for the perpendicularity surface to be placed against a flat surface of a piston-wall depression that is perpendicular to the piston-pin bore surrounding an entrance to the piston-pin bore on either of opposite sides of the piston;
• the ring pusher having a pusher head on a ring-feed end adapted for being buttressed against a side of the lock ring for pushing the lock ring from a major diameter of the press-close taper to a minor diameter of the press-close taper proximate a circumferential entrance to the ring-guide bore for closing the lock ring selectively;
• the ring pusher having a slide rod that is oppositely disposed linearly from the pusher head;
• the slide rod having a cylindrical outside periphery that slides against the inside periphery of the ring-guide bore;
• the outside periphery of the slide rod being adapted for being inserted predeterminedly into an inside periphery of the piston-pin bore;
• an insertion plunger on a circumferential step intermediate the outside periphery of the slide rod and a center rod on a ring-insertion end of the ring pusher;
• the center rod being extended concentrically from the slide rod;
• and
• the center rod being adapted for entry predeterminedly into the inside periphery of the lock ring.