This Service Repair Manual provides comprehensive information for the YANMAR TNE series Industrial Diesel Engines. These engines are engineered for demanding industrial applications, offering robust performance and reliability. The manual covers a wide range of models, including the 2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88, 4TNE82, 4TNE84, 4TNE88, 3TNE84T, and 4TNE84T. YANMAR engines are recognized for their advanced diesel technology and durable construction, making them a trusted choice for various industrial operations. The purpose of this English-language manual is to guide owners and technicians through the maintenance, repair, and troubleshooting of these YANMAR industrial diesel engines. It includes detailed specifications, cross-sectional views, and step-by-step instructions with pictures for disassembly, reassembly, measurement, inspection, and adjustment procedures. Key areas covered include cooling, lubrication, fuel systems, governors, turbochargers, and special service tools. This resource is designed to assist both do-it-yourself enthusiasts and experienced mechanics in maintaining optimal engine performance and longevity.