Practice question

During lubrication system service, the technician finds the oil pressure relief (regulator) valve stuck open on a school bus diesel. This will MOST likely cause:

  1. Low oil pressure because oil is being diverted back to the sump prematurely
  2. Excessively high oil pressure
  3. No effect on oil pressure
  4. Coolant contamination

Answer: A — Low oil pressure because oil is being diverted back to the sump prematurely

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