The YANMAR SY Series represents a line of marine diesel engines engineered for reliable marine propulsion. These engines are designed to meet the demanding requirements of marine applications, offering robust performance and durability. Built with YANMAR's commitment to quality, the SY Series provides efficient power solutions for a variety of vessels. This Service & Repair Manual provides comprehensive guidance for the YANMAR SY Series marine engines. It covers essential maintenance procedures, diagnostic information, technical specifications, and safety guidelines necessary for the upkeep and repair of these diesel engines. This manual is an indispensable resource for owners, technicians, and mechanics to ensure optimal performance and longevity of their YANMAR marine propulsion systems.