Engine Safety (Supplementary) USCG Question #389 (Set 5)

The component labeled "A" on the engine reversing device shown in the illustration, performs its function by transmitting _______. Illustration MO-0125

USCG Exam Illustration MO-0125
USCG Examination Diagram: Illustration MO-0125
Official USCG Answer & Rule Citation

Correct Answer: Option D — a pneumatic signal which activates a hydraulic control cylinder allowing the camshaft to shift axially

Marine diesel reversing systems commonly employ a pneumatic control signal that actuates a pneumatic-hydraulic servo cylinder. This mechanism shifts the camshaft axially to engage a distinct set of ahead or astern cams with the roller followers.

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