This workshop service manual covers the Yanmar TNM 3TNM68 and 3TNM72 industrial engines. These 3-cylinder engines are engineered for robust performance and reliability in demanding industrial applications. Yanmar's commitment to quality is evident in the durable construction and efficient operation of these power units, designed to meet the rigorous requirements of various industrial settings. This comprehensive manual provides essential information for the maintenance, repair, and troubleshooting of your Yanmar industrial engine. It includes detailed procedures for periodic maintenance, engine repair, fuel system service, cooling system service, lubrication system service, starter motor service, alternator service, and electric wiring service. With step-by-step instructions, diagrams, illustrations, and technical details, this guide empowers owners, mechanics, and technicians to ensure optimal performance and longevity of their Yanmar engines.