The Sulzer ZV40/48 engine is a widely respected marine and industrial diesel engine, known for its durability and efficiency. Central to its operation is the cylinder liner, designated as K 21401, which is crucial for maintaining the integrity and performance of the engine. The cylinder liner provides a smooth, wear-resistant surface for the piston to travel. This component is essential for reducing friction, managing heat, and ensuring optimal combustion. Regular maintenance and timely replacement of the cylinder liner are vital for prolonging the engine's lifespan and maintaining its performance.