This manual covers the Yanmar 6SY-STP2, 6SY655, and 8SY-STP marine engines. These engines are engineered for demanding marine applications, offering robust performance and reliability. Yanmar's commitment to quality ensures these units are built to withstand the rigors of maritime operations, providing dependable power for a variety of vessels. This comprehensive service and repair manual provides detailed information essential for maintaining and troubleshooting your Yanmar marine engines. It includes step-by-step instructions, hundreds of pages of content, detailed photos and diagrams, and exploded views. This resource is designed for owners, mechanics, and technicians to ensure optimal performance and longevity of the engines.