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Which noise indicates ring gear or pinion tooth damage?

  • A.A rattle after the engine starts, which indicates that the pinion has failed to disengage from the ring gear
  • B.A harsh grinding on engagement at certain positions
  • C.A whine while cranking, which indicates that the reduction gears within the starter have worn during service
  • D.A single click

Answer: B

Damage confined to part of the ring gear produces grinding only when the engine stops in certain positions. Failure to disengage does rattle, which makes the last option a genuine separate fault worth distinguishing. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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