The Sulzer ZV 40/48 engine uses self-locking nuts, such as those with code number K 45067, specifically designed for securing threaded pins K 45063 and K 45064. These self-locking nuts play a critical role in maintaining the engine's structural integrity by preventing loosening due to vibrations and mechanical stresses commonly encountered in marine environments. By ensuring a secure fit, these nuts enhance the overall reliability and performance of the Sulzer ZV 40/48 engine, contributing to safer and more efficient operation under demanding conditions.