Practice question

A turbocharger compressor wheel has noticeable radial play, and the blades show signs of contact with the housing. What is the most likely cause?

  1. A failed wastegate actuator diaphragm
  2. Worn compressor shaft journal bearings, typically caused by oil starvation or contaminated oil
  3. An air leak in the intercooler hose connections
  4. Using fuel with an incorrect octane rating

Answer: B — Worn compressor shaft journal bearings, typically caused by oil starvation or contaminated oil

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