The YANMAR 6LY Series Marine Diesel engines, encompassing models 6LY2-STE, 6LY2A-STP, and 6LYA-STP, represent robust inline 6-cylinder marine diesel powerplants. These engines are engineered for reliability and performance in demanding marine applications, featuring advanced water-cooling systems and comprehensive coverage of fuel injection and lubrication systems. With power outputs ranging from approximately 315 HP to 440 HP, these engines are designed to deliver efficient and dependable operation for a variety of vessels. This comprehensive Service Repair Workshop Manual provides essential information for maintaining and repairing your YANMAR 6LY Series engine. It covers all aspects of engine operation, including detailed repair procedures, disassembly and reassembly guides, routine maintenance schedules, and oil capacity specifications. Additionally, the manual includes troubleshooting guidance for common issues, as well as information on the electrical, intake and exhaust, and remote control systems, ensuring that owners and technicians have the resources needed for optimal engine performance and longevity.