You are assigned to an OSV fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illu...

Question

You are assigned to an OSV fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the exhaust valves open and close respectively?

Accepted Answer

The exhaust valves open at 55o before bottom dead center on the power stroke. The exhaust valves close at 85o after top dead center on the intake stroke.

Engine: Motor Plants and Auxiliary Boilers

You are assigned to an OSV fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the exhaust valves open and close respectively?

Appears on the 2026 sample exam for

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