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Which fault does an overtight alternator belt cause?

  • A.Low output
  • B.Belt failure through fatigue, which occurs because the additional tension exceeds the strength of the cords within it
  • C.Premature bearing failure
  • D.Slipping under load, which follows from the belt being unable to conform to the profile of the pulley correctly

Answer: C

Side load on the front bearing is proportional to belt tension, and excessive tension destroys it in months. Belt fatigue genuinely does follow as well, which makes the last option a real consequence. Automatic tensioners remove the guesswork. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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