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Which bearing does a starter typically use at each end?

  • A.A needle roller
  • B.A plain steel bush, which is pressed into the housing and requires no lubrication during its service life
  • C.A porous bronze bush
  • D.A ball bearing, which is required because of the very high speed at which the armature rotates during cranking

Answer: C

Sintered bronze bushes impregnated with oil suit the intermittent duty and are cheap to replace. Ball bearings genuinely appear in heavy duty and geared starters, which makes the second option a real construction. Bush wear allows the armature to rub the pole shoes. 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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