This manual covers the Volvo TAD1640GE, TAD1641GE, and TAD1642GE engine series. These are powerful, inline 6-cylinder, turbocharged, and intercooled diesel engines with a displacement of 16.1 liters. They are designed for demanding applications such as generator sets and industrial equipment, offering robust performance with varying power outputs up to 510 kW (684 hp) and substantial torque. The engines feature a water-cooled system and forced lubrication for reliability and longevity. The purpose of this Service Repair Manual is to provide comprehensive guidance for the service, maintenance, and troubleshooting of the Volvo TAD1640GE, TAD1641GE, and TAD1642GE engines. It details essential procedures and technical specifications necessary for proper upkeep and repair. This manual is an indispensable resource for owners, mechanics, and technicians, ensuring the continued optimal performance and operational integrity of these industrial diesel engines.