This manual covers the Jaguar XK Series, encompassing the XK120, XK140, and XK150 models produced between 1948 and 1961. These luxury sports cars are renowned for their elegant styling, powerful Jaguar XK Straight-6 engines ranging from 3.4L to 3.8L, and exceptional handling characteristics that established Jaguar's post-war reputation. Featuring body-on-chassis construction and available in Roadster, Fixed Head Coupe, and Drop Head Coupe variants, the XK Series offered impressive performance for its era, with racing success at Le Mans contributing to its esteemed heritage. This comprehensive Parts Workshop Service Repair Manual provides detailed guidance for the maintenance, repair, and overhaul of all major systems, including the engine, fuel system, cooling system, clutch, gearbox, suspension, brakes, and electrical systems. It details procedures for engine rebuilding, component diagnosis, and repair instructions, along with parts identification and technical specifications. This manual is an essential resource for owners, mechanics, and technicians seeking to preserve the performance, reliability, and longevity of their Jaguar XK Series vehicles.