A lifter bore groover tool for precisely forming an axial groove in a cylindrical lifter bore comprising, in combination:
- a housing in an essentially rectilinear configuration with an upper wall and a lower wall 18 and a plurality of side walls coupling the upper and lower walls, the side walls including a thin cutting wall and a parallel thin adjusting wall and with enlarged parallel facing walls coupling the thin walls;
- an unthreaded first bore formed in the housing having an axis parallel with the side walls and located adjacent to the cutting wall with a long cylindrical chamber there beneath in communication with a guide slot extending through the cutting wall upwardly from the bottom wall and with a short cylindrical chamber there above;
- a threaded second bore formed in the housing having an axis parallel with the side walls and located adjacent to the adjusting wall with a lateral chamber there beneath located above the bottom wall extending through an opening in a central region of the adjusting wall and with an intermediate cylindrical chamber there above;
- a cylindrical cutting block axially reciprocable within the long cylindrical chamber with a cutting tool removably supported in the cutting block extending laterally through the guide slot adapted to contact a surface of a bore to be grooved, and with a set screw for removably supporting the cutting tool within the cutting block, the cutting block and cutting tool being axially adjustable;
- a first bolt received within the first bore, the first bolt having an upper end with a head located within the short cylindrical chamber and an allen head recess for rotation by the user, the first bolt having a lower end threadedly coupled with respect to the cutting block at its top whereby rotation of the first bolt will axially shift the cutting block and tool to cut an axial groove in a bore upon rotation of the first bolt by the user;
- an axial recess formed in the cutting block on a side thereof remote from the cutting tool and guide slot with a guide pin positioned with the housing beneath the lateral chamber with an interior end located within the axial recess to preclude rotation of the cutting block and cutting tool during rotation of the first bolt;
- an adjustment block located in the lateral chamber for lateral movement to enlarge and reduce the circumference of the tool after insertion into a bore, the adjustment block having a flat vertical exterior face for slidably contacting a bore during operation and use and a downwardly angled interior face and a laterally extending adjustment slot through the adjustment block between interior and exterior surfaces;
- a second bolt threadedly received within the threaded second bore, the second bolt having an upper end with a head located within the intermediate cylindrical chamber and an allen head recess for rotation by the user, the second bolt having a lower end with a conical configuration in rotatable sliding contact with the angled interior face of the adjustment block whereby rotation of the second bolt will laterally shift the adjustment block within the lateral chamber upon rotation of the second bolt by the user;
- and
- a guide pin positioned within the housing spanning the adjustment chamber with an intermediate extent located within the adjustment slot to maintain an exterior face parallel with the adjustment face of the housing and the housing in a fixed orientation during operation and use.