This Service Repair Workshop Manual provides comprehensive information for the International Harvester BD154 engine, a versatile power unit utilized across various applications. The BD154 engine, with a displacement of 154 cubic inches (2.52 Liters), is designed for robust performance and reliability, featuring liquid cooling and available in both diesel and potentially gasoline variants. This manual covers essential aspects of its operation and maintenance, ensuring the longevity and efficiency of the engine in its intended roles. The purpose of this manual is to serve as a definitive guide for owners, mechanics, and technicians. It details critical maintenance procedures, including gear train timing, cylinder head installation, and break-in procedures for both diesel and gasoline models. Furthermore, it offers troubleshooting guidance, technical specifications, and step-by-step instructions accompanied by diagrams and illustrations. This resource is designed to facilitate effective maintenance and repair, ensuring the BD154 engine operates at peak performance.