This manual covers the YANMAR 4LHA Series marine diesel engines, including models such as 4LHA-STE, 4LHA-STZE, 4LHA-STP, 4LHA-STZP, 4LHA-DTE, 4LHA-DTZE, 4LHA-DTP, 4LHA-DTZP, 4LHA-HTE, 4LHA-HTZE, 4LHA-HTP, and 4LHA-HTZP. These engines are 4-cylinder, in-line, 4-stroke water-cooled diesel units with a displacement of 2.197 Liters. They are available in naturally aspirated (DTE, DTP series) or turbocharged (STE, STP, HTE, HTP series) configurations, offering various power outputs suitable for marine applications. The engines feature direct injection fuel systems and are designed for reliability and efficient operation. This comprehensive Service Repair Workshop Manual provides detailed information essential for the maintenance and repair of your YANMAR 4LHA Series engine. It includes step-by-step instructions, exploded views, and diagrams covering all major systems such as the basic engine, fuel injection equipment, intake and exhaust, lubrication, cooling water, and the reduction and reversing gear. This manual is an invaluable resource for owners, mechanics, and technicians, enabling them to perform routine maintenance, diagnose issues, and execute repairs effectively, ensuring the longevity and optimal performance of the engine.