This manual provides comprehensive service and repair information for the IH International Harvester BD154 Engine. Designed for owners and technicians alike, it covers all aspects of maintaining and repairing this engine model. The BD154 engine is known for its robust engineering and reliability, making it a dependable choice for various applications. This guide ensures that users can effectively manage their engine's upkeep and address any potential issues with confidence. The scope of this manual is extensive, detailing crucial service procedures, technical specifications, and troubleshooting guides. It includes step-by-step instructions for tasks such as cylinder head installation, bearing replacement, and gear train timing, along with break-in procedures for both diesel and gasoline rebuilt engines. With detailed illustrations, diagrams, and an advanced troubleshooting section, this manual empowers users to perform diagnostics and repairs efficiently, mirroring the knowledge of factory-trained technicians and helping to maintain the optimal performance and longevity of the IH International Harvester BD154 Engine.