This service manual covers the Komatsu 82E-6 and 98E-6 Diesel Engines, specifically for engine models 3D82AE-6, 3D88E-6, and 4D88E-6, along with associated machines such as the PC27MR-3, PC30MR-3, PC35MR-3, PC55MR-3, and WA50-6. These engines are known for their robust engineering and reliability, designed for demanding operational environments. This manual provides comprehensive technical data and detailed instructions to ensure optimal performance and longevity of your Komatsu equipment. The purpose of this manual is to serve as a complete guide for maintenance, repair, and troubleshooting of the specified Komatsu diesel engines. It includes detailed sections on general information, engine mechanical components, fuel, exhaust, cooling, lubrication, electrical, intake, and preheating systems, among others. With clear, step-by-step instructions, diagrams, and illustrations, this manual empowers owners, mechanics, and technicians to perform necessary service procedures efficiently and effectively, saving both time and resources.