This factory workshop manual covers the Komatsu S6D140-2, SA6D140-2, and SAA6D140-2 series diesel engines. These engines are designed for robust performance and reliability in various heavy-duty applications, including motor graders, wheel loaders, bulldozers, hydraulic excavators, dump trucks, and generators. The engineering quality of these diesel engines ensures durability and efficiency, making them a trusted choice for demanding operational environments. This comprehensive 364-page English-language manual provides essential information for the service and repair of these diesel engines. It includes detailed step-by-step instructions for repair and overhaul, explanations of component and system functions, and critical specifications and tolerances. With easy-to-read text, top-quality diagrams, pictures, and illustrations, this manual is an indispensable resource for owners, mechanics, and technicians to effectively maintain and repair their Komatsu equipment.