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Which purpose do shims behind a starter serve on some engines?

  • A.Reducing vibration
  • B.Correcting the alignment of the armature, which must be parallel with the crankshaft in order to mesh correctly
  • C.Setting the pinion to ring gear clearance
  • D.Insulating the starter electrically, which prevents the return current from passing through the mounting bolts

Answer: C

Too little clearance produces a high pitched whine and too much produces a grinding engagement, so shims set it correctly. Alignment genuinely is affected, which makes the last option part of the same adjustment. The clearance is measured with the pinion engaged. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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