This workshop service repair manual covers the Yanmar 4LHA series marine diesel engines, specifically models 4LHA-STE/STZE/STP/STZP, 4LHA-DTE/DTZE/DTP/DTZP, and 4LHA-HTE/HTZE/HTP/HTZP. These engines are engineered for reliable performance in marine applications, offering robust construction and efficient operation essential for demanding maritime environments. This manual provides comprehensive documentation for maintaining and servicing these high-quality Yanmar power units.

The purpose of this manual is to serve as a definitive guide for all aspects of engine maintenance and repair. It includes detailed information on safety procedures, general engine overviews, and in-depth coverage of critical systems such as fuel injection, intake and exhaust, lubrication, and cooling. Furthermore, it addresses the reduction and reversing gear, optional remote control systems, and the electrical system, equipping owners, technicians, and mechanics with the necessary knowledge for effective upkeep and troubleshooting.