This workshop service manual covers the Yanmar 6LP / 6LPA Series marine diesel engines. These engines are known for their robust construction, reliability, and efficient performance, featuring a 6-cylinder, vertical configuration with water-cooling and turbocharging. Applicable models include a range of designations such as 6LP-DTE, 6LPA-DTP, and 6LPA-STP2, among others, with displacements of 4.163 or 4.164 liters. The direct injection fuel system on the 4.164L models further enhances their operational efficiency. This comprehensive manual provides essential information for the maintenance and repair of your Yanmar engines. It includes detailed procedures for disassembly, assembly, inspection, testing, and adjustments, alongside a dedicated troubleshooting guide. Technical data such as torque specifications, fluid recommendations, and service standards are also covered. System-specific information, including the fuel, intake, exhaust, cooling, lubrication, turbocharging, and electrical systems, is thoroughly explained, along with wiring diagrams and component details. Safety instructions and information on special tools required for service are also included, making this manual an indispensable resource for owners and technicians.