Question 52Motor Plants - 1st Asst/Chief

The correct answer is B) starting air and fuel pumps. To reverse the rotation of a two-stroke cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions for the starting air and fuel pumps must be changed. This is because the starting air and fuel pumps are responsible for introducing the necessary air and fuel to start the engine and provide propulsion power. By changing the cam positions for these components, the engine's rotation can be reversed. The other options are incorrect because the piston cooling pumps (A) and exhaust valves (C) are not directly involved in reversing the engine's rotation. Changing the cam positions for these components would not be sufficient to reverse the engine's direction of rotation.