Engine Safety (Supplementary) USCG Question #366 (Set 5)

Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046

USCG Exam Illustration MO-0046
USCG Examination Diagram: Illustration MO-0046
Official USCG Answer & Rule Citation

Correct Answer: Option B — The air starting valve is opened by cam action.

Pneumatic starting valves on marine diesels are mechanically unseated by pushrods driven by pilot air or direct cam action synchronized with the engine firing order.

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