Crown Wheel and Pinion

GENERAL
The crown wheel and pinion are matched and may be replaced only as a pair. The parts are tested together, and the optimum setting for minimum noise is then determined. The dimensions which are important for the pinion and crown wheel are the distance between the end face of the pinion and the center of the crown wheel, and the backlash between the teeth. These dimensions and the matching number are stamped on both parts after testing. When the pinion and crown wheel are fitted, these dimensions must be accurately adjusted with shims, using a special measuring instrument. The pinion shims are located at the output shaft bearing housing, whereas the crown wheel (differential) shims are located at the two differential bearing housings.