This service repair workshop manual covers the International Harvester BD144A Engine. This engine, with a displacement of 144 cubic inches, is designed for robust performance and reliability. It features a diesel/gasoline engine type, adaptable to specific rebuild procedures. Detailed installation procedures are provided for critical components such as the cylinder head, multi-piece oil control ring, connecting rod bearings, and camshaft bearings. The manual also includes procedures for gear train timing and specific removal instructions for the lubricating oil pump on Engine Model BC-144. This comprehensive manual is intended to assist owners, mechanics, and technicians in maintaining and repairing the International Harvester BD144A Engine. It provides detailed information on rebuild procedures, including break-in processes for both diesel and gasoline variants, and troubleshooting guidance. General specifications are included to ensure accurate diagnostics and repairs. Furthermore, the manual outlines user-performable maintenance tasks such as oil, spark plug, and air filter changes, empowering users to manage routine upkeep and potentially reduce service costs.