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

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During a cylinder compression test on a school bus diesel, one cylinder reads significantly lower than the others. Adding a small amount of oil through the injector bore raises that cylinder's reading noticeably. This indicates:

A burned valve or damaged valve seat A cracked cylinder head between cylinders A leaking head gasket to the cooling jacket Worn rings or cylinder bore (ring sealing issue)

Correct Answer:

Worn rings or cylinder bore (ring sealing issue)

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