Question 190Motor Plants - Assistant Engineer

The correct answer is D) all of the above. The oil-operated, direct reversing mechanism on a large, low-speed, main propulsion diesel engine can serve to bring the respective cam under the air distributor pilot valves, bring the respective cam under the fuel pump roller, and rotate or displace the camshaft according to the engine design. This mechanism allows for the precise control and timing of the engine's operation, which is crucial for the efficient and safe functioning of the main propulsion system. The other options are incorrect because they only describe a partial function of the oil-operated, direct reversing mechanism, whereas the correct answer encompasses all the key capabilities of this important component.