This workshop service repair manual covers the Volvo TAD1641GE diesel engine, designed for robust performance and reliability. This inline 6-cylinder engine features a displacement of 16.1 liters, a turbocharged and intercooled aspiration system, and delivers power up to 440 kW (590 hp) with torque up to 2500 Nm. Engineered to meet Tier 2 / Stage II emission standards, the TAD1641GE is a water-cooled unit built for demanding applications where consistent power output and durability are paramount. Its substantial construction, with an approximate dry weight of 1160 kg, underscores its suitability for heavy-duty industrial and power generation use. This comprehensive English-language manual provides essential information for the maintenance, repair, and troubleshooting of the Volvo TAD1641GE engine. It details diagnostic procedures and repair instructions to ensure the unit operates at peak efficiency and longevity. Key maintenance areas covered include recommended service intervals and fluid capacities, such as an approximate oil capacity of 45 liters and a coolant capacity of 75 liters. This resource is intended for owners, technicians, and mechanics seeking to understand and maintain the engine's complex systems, ensuring optimal performance and extending its operational life.