This manual covers the Komatsu 107E-1 Series Engine, a robust diesel engine designed for service and repair applications. Known for its engineering quality and reliability, this engine is built to perform under demanding conditions. Its development prioritizes durability and efficient operation, making it a trusted choice for various industrial and heavy-duty uses. The purpose of this Service Repair Manual is to provide comprehensive guidance for maintaining and repairing the Komatsu 107E-1 Series Engine. It includes detailed information on structure, function, maintenance standards, testing, adjusting, and troubleshooting. With numbered instructions, detailed substeps, safety notes, cautions, warnings, and numerous illustrations, this manual is an essential resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of the engine.