Exam Question

Manual Engine Reversing for Sulzer & MAN B&W Engines 🚢
For Sulzer and MAN B&W (MC-C) two-stroke engines, the engine is reversed by shifting the roller position on the fuel cams. This is achieved using pneumatic cylinders , with one cylinder attached to each fuel pump roller. The position of these rollers determines whether the engine operates in the ahead or astern direction.
Manual Reversing Procedure 🛠️
To manually reverse the engine, the control must first be switched from remote (bridge control) to local (engine room control). This supplies control air to the local maneuvering station and all associated valves. At the local station, a selector switch for 'Ahead' and 'Astern' is used. This switch sends an air signal to a main reversing valve, which in turn directs air to all the pneumatic cylinders, shifting the fuel pump rollers to the desired position.