Practice question

A school bus diesel has fuel in the engine oil (rising oil level, fuel odor). The MOST likely cause is:

  1. A leaking injector body or injector seal allowing fuel into the crankcase
  2. A plugged air filter
  3. A loose battery terminal
  4. A worn wheel bearing

Answer: A — A leaking injector body or injector seal allowing fuel into the crankcase

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Practice more: ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam →