The setting device, code 11.49021-1206-1.0, is an essential tool for calibration and fine adjustments on the MAN L21/31 engine. It enables engineers to align and adjust components such as valves, timing mechanisms, and injection systems with precision. Proper use of the setting device ensures that the engine operates at peak performance, reduces wear, and enhances fuel efficiency. It is a critical tool in maintaining the engine’s long-term reliability and operational safety.