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Which component engages the starter pinion with the flywheel?

  • A.The armature itself, which moves axially as the current is applied and therefore carries the pinion into mesh
  • B.The ring gear
  • C.The one way clutch, which slides the pinion along the shaft as the motor begins to rotate the armature within it
  • D.The solenoid through a lever and drive assembly

Answer: D

The solenoid pulls a plunger that moves a lever, sliding the drive assembly along the shaft into mesh before closing the main contacts. Inertia starters did use the armature rotation to throw the pinion into mesh, which makes the alternatives historically real. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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