This document pertains to the Komatsu SA12V140Z-1 Series Engine, a V-Type diesel engine featuring 12 cylinders and water cooling. Engineered for robust performance and reliability, this engine is designed to meet demanding operational requirements across various applications. Its construction emphasizes durability and efficiency, making it a dependable power source for heavy-duty equipment. This Workshop Service Manual provides comprehensive guidance for the maintenance, repair, and troubleshooting of the Komatsu SA12V140Z-1 Series Engine. It includes detailed repair procedures and a troubleshooting guide to assist owners, mechanics, and technicians in maintaining optimal engine performance and longevity. Refer to this manual for essential information regarding service intervals, fluid capacities, and diagnostic procedures.