This manual covers the YANMAR TNE series Industrial Diesel Engines, specifically models 4TNE88, 4TNE94T, 4TNE98T, and 4TNE106T. These engines are designed for industrial applications and feature a 4-stroke, direct injection diesel system. YANMAR engines are recognized for their robust engineering and reliability, making them a preferred choice for demanding operational environments. This document provides comprehensive information to ensure the optimal performance and longevity of your YANMAR diesel engine. The purpose of this Service Repair Manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of the specified YANMAR diesel engines. It includes essential technical specifications, step-by-step repair procedures, diagnostic information, and safety precautions. This manual is an indispensable resource for owners, technicians, and mechanics seeking to understand and maintain these industrial diesel engines, ensuring they operate efficiently and reliably throughout their service life. A companion Parts Manual is also available for component identification.