This Shop Manual provides comprehensive guidance for the Komatsu S6D108-1 and SA6D108-1 internal combustion engines. Designed for diesel fuel, these inline 6-cylinder engines are engineered for robust performance and reliability in demanding applications. The manual is intended for the repair and overhaul of the Komatsu 108 series engines, ensuring that their operational efficiency is maintained. This 256-page document is structured to assist owners, mechanics, and technicians in performing maintenance and repairs correctly and efficiently. It features easy-to-read text accompanied by top-quality diagrams, pictures, and illustrations to clearly explain the functions of components and provide step-by-step instructions. The manual covers essential technical information, including specifications and tolerances, enabling users to save time and ensure accurate service.