This manual covers the Volvo TAD1641VE and TAD1642VE diesel engines, robust inline 6-cylinder powerplants designed for demanding applications. These engines feature a 16.1-liter displacement, turbocharged and aftercooled aspiration, and are engineered to deliver high torque output. The TAD1641VE offers power up to 500 kW (670 hp), while the TAD1642VE provides up to 570 kW (764 hp), both at 1800-2100 rpm, with variations depending on specific application configurations. These engines are built for reliability and efficiency, meeting various emission standards such as Tier 2, Tier 3, Stage II, and Stage III. This comprehensive Factory Service Repair Manual in English provides detailed information essential for the maintenance and repair of your Volvo engine. It covers critical areas including lubrication, cooling, fuel, and electrical systems, with specific guidance on oil and coolant capacities, recommended viscosity, and service intervals. Procedures for replacing oil, fuel, and air filters are thoroughly explained. Additionally, the manual includes technical specifications and troubleshooting guidance to assist owners, mechanics, and technicians in ensuring optimal performance and longevity of the TAD1641VE and TAD1642VE engines.