The International Harvester (IH) Farmall B and BN tractors, produced between 1941 and 1950, represent a significant era in agricultural mechanization. These versatile tractors, powered by IH C-113 or C-123 gasoline engines, were designed for general-purpose farm work, offering reliability and efficiency for small to medium-sized operations. The Farmall B was a staple on many farms, known for its robust construction and adaptability, while the BN variant provided an option for farms utilizing propane fuel. Their enduring legacy is built on a foundation of solid engineering and practical utility, making them valuable assets for their intended purpose and for collectors and restorers alike. This comprehensive manual set provides essential information for the maintenance, repair, and operation of the IH Farmall B and BN tractors. It includes detailed service and repair manuals, parts catalogs, owner's/operator's guides, and information on electric starting and lighting attachments. Within its pages, you will find step-by-step procedures for engine overhauls, transmission repairs, brake adjustments, and electrical diagnostics, alongside routine maintenance schedules, fluid specifications, and troubleshooting guides. The manual is designed to assist owners, mechanics, and technicians in keeping these classic tractors in optimal working condition, ensuring their continued performance and longevity.