The YANMAR 6LY3 Series is a robust marine diesel engine designed for demanding applications. This inline 6-cylinder, 4-stroke engine features turbocharged and intercooled aspiration, coupled with a direct injection common rail fuel system for efficient power delivery. With a displacement of 5.81 liters, it offers impressive performance, with rated power outputs varying by specific model, such as 315 MHP or 370 MHP at 2100 RPM. The engine's engineering emphasizes reliability and durability, making it a dependable choice for marine propulsion. It adheres to emission standards like EPA Tier 3 and IMO Tier II, depending on the region and specific configuration. This Service Shop Repair Manual in English provides comprehensive guidance for the YANMAR 6LY3 Series marine diesel engine. It covers essential areas including servicing, repair, preventative maintenance, and troubleshooting procedures. The manual is an indispensable resource for owners, mechanics, and technicians, offering detailed technical specifications, maintenance schedules, and diagnostic information. By following the instructions and recommendations within this manual, users can ensure optimal performance, longevity, and safe operation of their YANMAR marine diesel engines.