The Komatsu 4D106E and 4TNE106T engines are robust, 4-cylinder inline powerplants designed for demanding applications. Featuring a 3.30L displacement and water-cooled operation, these engines are engineered for reliability and performance. The 4TNE106T variant is turbocharged, enhancing its power output, which varies by specific application and tuning. These engines are built with Komatsu's renowned quality, ensuring durability and efficient operation across a range of uses. This workshop service manual provides comprehensive guidance for the Komatsu 4D106E and 4TNE106T engines. It covers essential maintenance procedures, detailed troubleshooting steps, technical specifications, and safety guidelines. Designed for owners, mechanics, and technicians, this manual offers the complete factory service information necessary to maintain, repair, and optimize the performance of these engines. With hundreds of pages of detailed instructions and diagrams, it serves as an indispensable resource for ensuring the longevity and proper functioning of your Komatsu engine.