Question 231Motor Plants - 1st Asst/Chief

The correct answer is B) sliding the camshaft along its axis. In four-stroke cycle diesel engines, the reversing cams are brought into position by sliding the camshaft along its axis. This allows the camshaft to rotate in the opposite direction, effectively reversing the opening and closing of the engine's valves. Sliding the camshaft is the mechanism used to achieve this reversal, rather than rotating the cam followers or the cams themselves by 180 degrees. The other answer choices are incorrect because they do not accurately describe the mechanism used to reverse the cams in a four-stroke cycle diesel engine. Moving the idler sprockets, rotating the cam followers, or rotating the cams themselves would not achieve the necessary reversal of the valves' opening and closing.