This manual covers the Yanmar 3TNV and 4TNV Series industrial diesel engines. These engines are engineered for reliability and performance in demanding applications. The series includes models such as the 3TNV82A, 3TNV84(T), 4TNV84(T), 3TNV88, 4TNV88, 4TNV94L, 4TNV98, 4TNV98T, 4TNV106, and 4TNV106T. Yanmar engines are recognized for their robust construction and efficient operation, making them a trusted choice for various industrial equipment. The purpose of this comprehensive Service Repair Manual is to provide detailed technical information for the maintenance, repair, and overhaul of your Yanmar engine. It includes essential procedures for disassembly, reassembly, inspection, and adjustment, along with troubleshooting guidance and repair standards. Specific sections cover the fuel injection pump, lubrication system, cooling system, turbocharger, starting motor, and alternator. This manual is an indispensable resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the Yanmar 3TNV and 4TNV Series engines.