This workshop repair and service manual covers the Jaguar XK120, XK140, and XK150 models produced between 1948 and 1961. These iconic British sports cars, manufactured in Coventry, England, are celebrated for their elegant design, powerful XK inline 6-cylinder engines, and spirited performance. From the groundbreaking XK120, which set speed records, to the refined XK140 and the updated XK150 with its more modern styling and performance options, this range represents a significant era in automotive history. Whether equipped with the standard 4-speed manual transmission or the optional automatic transmission, these vehicles offer a classic driving experience and are highly sought after by collectors and enthusiasts worldwide. This comprehensive manual is designed to provide detailed guidance for the maintenance, repair, and restoration of all XK120, XK140, and XK150 models and variants. It covers essential areas including engine overhaul and tuning, transmission repair, brake system diagnosis, electrical system troubleshooting with detailed wiring diagrams, suspension and steering system servicing, cooling and fuel system maintenance, and chassis and bodywork. The manual also includes procedures for component disassembly and reassembly, cleaning, and reinstallation, offering in-depth technical information suitable for professional technicians and dedicated enthusiasts. With hundreds of pages of expert advice, this English-language resource is an indispensable tool for ensuring the longevity and optimal performance of these classic Jaguar automobiles.