This comprehensive workshop manual provides a detailed guide for servicing and repairing International Harvester Engines, specifically models 454, 474, 475, 574, and 674, commonly found in tractor units 2400 and 2500. The manual covers every aspect of maintenance and repair, offering detailed instructions and diagrams to help you tackle any issue with confidence. From routine maintenance procedures to complex troubleshooting and repair techniques, this manual is an essential resource for anyone working on these International Harvester engines.