This document covers the Komatsu 4D94E / 4TNE94T diesel engines. These inline 4-cylinder engines displace approximately 3.3 liters and feature direct injection. Engineered for reliability and robust performance, these engines are designed for various industrial and heavy-duty applications where dependable power is essential. Their construction emphasizes durability and efficiency, making them a suitable choice for demanding operational environments. This comprehensive Workshop Service Repair Manual provides detailed information for the maintenance and repair of the Komatsu 4D94E / 4TNE94T engines. It includes essential technical specifications, lubrication requirements, and service intervals. The manual is designed to assist owners, technicians, and mechanics in understanding the engine's systems, performing routine maintenance, and troubleshooting potential issues to ensure optimal performance and longevity.