The reversing cams of some four-stroke cycle diesel engines are brought into position by __________.

Correct Answer: Option B — sliding the camshaft along its axis

Reversing direct-drive marine diesel engines frequently utilizes a sliding camshaft design. Hydraulic or pneumatic servomotors shift the entire camshaft longitudinally along its axis, aligning astern running cams with the fuel injection and valve operating gear to reverse engine rotation.