This service repair manual covers YANMAR industrial engines, specifically the 2TNV70, 3TNV70, and 3TNV76 models. These vertical, water-cooled, 4-cycle diesel engines are designed for industrial applications and are known for their robust engineering. The engines feature displacements of 1.115 L for the 2TNV70, 1.339 L for the 3TNV70, and 1.496 L for the 3TNV76, with cylinder configurations of two for the 2TNV70 and three for the 3TNV70 and 3TNV76. Their reliable performance makes them suitable for demanding industrial environments. The purpose of this manual is to provide comprehensive guidance for the service and repair of these YANMAR engines. It details essential procedures for assembly and disassembly, along with critical technical specifications and wiring diagrams. This resource is invaluable for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their engines, ensuring they meet operational requirements through proper care and adherence to recommended service practices.