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When adjusting the front wheel bearings of a rear-wheel-drive car:

Technician A tightens the adjusting nut until there is no tire wobble.

Technician B tightens the adjusting nut to the appropriate torque, then tightens it slightly more to align the castellations of the locking nut with the cotter pin hole.

Who is right?

Answer :

Final answer:

Technician B's method of tightening the adjusting nut to an appropriate torque and then further securing it for alignment with the cotter pin is the correct approach according to industry standards.

Explanation:

The question concerns whether Technician A, who tightens the front wheel bearings of a rear-wheel-drive car until there is no tire wobble, or Technician B, who tightens the adjusting nut to the appropriate torque, then tightens it slightly more to align the castellations of the locking nut with the cotter pin hole, is correct in their method.

For proper adjustment of front wheel bearings on a rear-wheel-drive car, it typically involves setting the bearings to the right preload with a torque wrench, followed by securing the adjustment with a locking mechanism that may include aligning castellations for a cotter pin. Therefore, Technician B's approach aligns more closely with industry standards which require tightening the adjusting nut to a specified torque before securing it, ensuring both the longevity of the bearing's life and safety.

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