This service repair manual covers the Caterpillar NTC-400 BC2 Engine, a diesel engine designed for robust performance. While specific production years are not detailed, this engine is known for its engineering quality and reliability in demanding applications. Its 6-cylinder configuration and liquid-cooled system contribute to its operational efficiency, delivering approximately 400 horsepower through compression ignition. This manual provides comprehensive guidance for maintaining and repairing the Caterpillar NTC-400 BC2 Engine. It details essential procedures, technical specifications, and safety protocols necessary for optimal engine performance and longevity. Owners, mechanics, and technicians will find this English-language resource invaluable for understanding and executing all aspects of engine service, ensuring the continued dependability of this powerful diesel unit.