Abstract: The invention discloses a method and an apparatus for truing “pressed-together crankshafts” of the type found in multiple-cylinder-engines such as those used in personal watercrafts and snowmobiles. The truing of these crankshafts is effected by a truing tool comprised of a set of lockable V-block-type holding means, a hinging movable shelf so equipped as to cause one of the lockable V-block-type holding means to move the crankshaft alternatively into a measuring position and a truing position, a cam-operated lever, sliding position detection means and a top-mounted clamp, all of which are attached, directly or indirectly, to a rigid supporting base. The set of lockable V-block-type holding means is designed in accordance with the dimensions of the bearings and the journals of the crankshaft.

Abstract: The invention discloses a method and an apparatus for aligning crankshaft sections such as center sections of so-called “pressed-together crankshafts” found in multiple-cylinder-engines of the type used in personal motorized watercrafts and snowmobiles. The alignment of these crankshaft sections is effected by a phasing tool comprised of two symmetrical machined steel cylinders which are mounted on a die shoe, facing each other in virtual image formation, and provided with specifically designed phasing and centering tools. The phasing tools are designed in accordance with the diameters of the peripheral pins of the journals of the crankshaft section and the stroke of the crankshaft. A centering tool is used to center the crankshaft section with respect to the machined steel cylinders, and a spacing tool, placed between the two webs of the crankshaft section, prevents the force of the hydraulic-actuatordriven upper plate of the die shoe from compressing the crankshaft section excessively.