This document pertains to the Komatsu 12V140E-3, a robust diesel engine designed for demanding applications. Its V12 configuration, 14.0-liter displacement, and direct injection fuel system are engineered for reliable performance. The engine features a water-cooled system and forced lubrication to ensure optimal operation under various conditions. While specific production years and power output are not detailed, the core engineering of this engine emphasizes durability and efficiency for industrial and heavy-duty use. The purpose of this Service Repair Manual is to provide comprehensive guidance for the maintenance and repair of the Komatsu 12V140E-3 engine. It covers essential procedures, technical specifications, and troubleshooting information necessary for owners, mechanics, and technicians. Key areas include detailed maintenance schedules, filter replacement guidelines, and system overviews. This manual serves as an indispensable resource for ensuring the longevity and optimal performance of the engine.