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Which noise indicates too little pinion clearance?

  • A.A grinding on engagement, which indicates that the teeth are not meshing fully before the power is applied
  • B.A click
  • C.A rattle after starting, which indicates that the pinion has failed to withdraw from the ring gear completely
  • D.A high pitched whine during cranking

Answer: D

Tight meshing whines while excessive clearance grinds as the teeth meet only at their tips. Both are corrected by shimming. The two noises are the classic diagnostic pair for a shimmed starter installation. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Checking which component actually carries the load settles most questions of this kind at once. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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