A 18 cylinder medium speed direct reversible...

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Question 1 of 205eccefa3bacbc34ba4d47dd4

A 18 cylinder medium speed direct reversible main propulsion diesel engine is being operated with one cylinder secured. When the engine was stopped, the affected cylinder stopped in a position preventing the engine from being restarted. Which of the following actions should be taken to correct the situation?

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🔍 Key Concepts

• Behavior of a direct-reversible main engine when a cylinder is secured and stops on compression • How starting air acts on engine cylinders and crank position in different directions of rotation • Risks of using excessive starting air pressure or forcing movement against a blocked cylinder

💭 Think About

• What happens if the crank for the secured cylinder is sitting on or near top dead center on compression? Can starting air in the normal direction turn it past that point? • Which option safely changes the crankshaft angular position without excessively increasing stress or starting air pressure? • For a direct-reversible engine, how can you briefly use the opposite direction of rotation to free the crank, then set up again for the desired direction?

✅ Before You Answer

• Identify which choices involve simply increasing starting air pressure instead of changing crank position • Consider which actions could damage the engine or starting air system, especially if a cylinder is blocked on compression • Focus on the choice that repositions the crankshaft in a controlled way before attempting a normal restart

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