The Jaguar 420 and 420G, produced between 1966 and 1970, represent a significant chapter in Jaguar's history as refined luxury executive saloons. These models, distinct from Jaguar's sports car lineage yet sharing its engineering prowess, offered buyers a blend of elegant styling, potent performance from the XK inline-six engines, and a comfortable ride. They were designed to bridge the gap between the Mark 2 and the later XJ6, competing with esteemed rivals through their sophisticated handling and powerful drivetrains, including various iterations of the XK Series engine and options for manual or automatic transmissions.

This workshop service and repair manual provides comprehensive guidance for the Jaguar 420 and 420G models. It covers all major mechanical, electrical, and bodywork aspects, offering detailed procedures for routine maintenance, complex repairs, and troubleshooting. Within its pages, you will find in-depth information on the engine, transmission, drivetrain, suspension, brakes, steering, and electrical systems, complete with technical specifications, diagnostic charts, and adjustment procedures. This manual is an essential resource for owners, mechanics, and technicians dedicated to preserving the integrity and performance of these classic Jaguar vehicles.