This Service Repair Workshop Manual provides comprehensive information for the Volvo TAD1641VE diesel engine. As part of the TAD1640/1641/1642 engine family, this inline 6-cylinder engine features a 144 mm bore and 165 mm stroke, with a displacement of 16.1 L. It is engineered for robust performance, offering a maximum power output ranging from 450-515 kW (603-694 hp) and maximum torque between 2800-3400 Nm, depending on specific configurations. The engine utilizes a liquid-cooled system, direct injection with electronically controlled unit injectors, and a pressurized wet sump lubrication system, designed to meet emission standards such as Euro III / Tier 3. This manual serves as an essential resource for maintaining and repairing the Volvo TAD1641VE engine. It covers critical areas including engine identification, general precautions, disassembly and assembly procedures, maintenance checklists, and detailed servicing for various engine components such as the engine body, fuel system, cooling system, exhaust system, and electrical system. Furthermore, it provides guidance on special tools, troubleshooting, servicing specifications, tightening torques, and wiring diagrams, ensuring that owners, mechanics, and technicians have the necessary knowledge to keep the engine operating efficiently and reliably.