This manual covers the YANMAR 6LP-A-DT STE-P DTZE-P STZE-P Series Marine Engines. These diesel engines are water-cooled, feature a 4-cycle operation, and are equipped with turbocharging and direct injection. With a 6-cylinder vertical configuration and a displacement of either 4.163L or 4.164L, these engines are engineered for robust performance and reliability in marine applications. The series includes various models such as the 6LP-DTE, 6LPA-STP2, and others, designed to meet diverse operational demands. This comprehensive Workshop Service Repair and Operations Manual provides essential information for the maintenance and repair of your YANMAR marine engines. It details general information, safety instructions, maintenance procedures, technical data, and troubleshooting guides. The manual includes step-by-step instructions, detailed illustrations, and specific guidance on various engine systems, including fuel, cooling, lubrication, and electrical components. It is intended for both do-it-yourself owners and experienced mechanics, offering the necessary knowledge to ensure optimal engine performance and longevity.