What does Technician A claim about the distance from the crankshaft to the connecting rod journal?

The distance from the crankshaft to the connecting rod journal is indeed equal to half the total travel of the piston because of the mechanical relationship between these components in a reciprocating engine. The crankshaft converts the linear motion of the pistons into rotational motion, and the stroke of the piston refers to the total distance it travels from the bottom dead center (BDC) to the top dead center (TDC).

Since the connecting rod journal is positioned on the crankshaft, the distance to the journal represents only one half of this complete stroke, as the crankshaft rotates and moves the pistons upward and downward in the cylinder. This principle is fundamental in understanding how internal combustion engines operate, as it illustrates the motion transfer inside an engine. Each crank journal advances by a distance that corresponds to the piston stroke during each turn of the crankshaft, reinforcing the relationship between piston movement and crankshaft rotation.