The YANMAR 4LH-TE, 4LH-HTE, 4LH-DTE, and 4LH-STE marine engines represent robust diesel power solutions engineered for reliable marine propulsion. These inline 4-cylinder engines are built with YANMAR's commitment to quality and durability, ensuring consistent performance in demanding marine environments. Their design focuses on efficiency and longevity, making them a trusted choice for various maritime applications where dependable operation is paramount. This comprehensive repair and service manual provides essential information for maintaining and repairing your YANMAR marine engine. It covers critical areas including routine maintenance procedures, detailed troubleshooting guides for advanced issues, recommended service intervals, and specific guidance on lubrication, cooling systems, and fuel systems. Technicians and owners will find the detailed engine specifications and step-by-step instructions invaluable for ensuring optimal performance and extending the operational life of their vessel's propulsion system.