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Which damage results from cranking a running engine?

  • A.Damage to the battery, which is subjected to a very heavy discharge while the engine is already running normally
  • B.None
  • C.Overheating of the starter motor, which is driven by the engine and therefore acts as a generator during the event
  • D.Stripped ring gear and pinion teeth

Answer: D

The pinion meets a ring gear turning far faster and the teeth are chewed away. The one way clutch protects the armature, so the motor itself survives. Automatic release exists precisely to prevent it. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. Naming what changes and what stays the same is the reliable route through questions of this shape.

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