Description
Factory Jaguar Mark X Workshop Manual (1961–1970)
This OEM-level repair manual covers every Jaguar Mark X and 420G produced from 1961 through 1970, giving American restorers and enthusiasts the complete factory procedures needed to maintain and overhaul these iconic British full-size sedans.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | 3.8L XK DOHC inline-six (1961–1964), 4.2L XK DOHC inline-six (1964–1970) |
| Diesel | N/A |
| Transmissions | Moss 4-speed manual; Borg-Warner Model 8 3-speed automatic; Borg-Warner Model 12 automatic |
| Drive | RWD |
| Model Years | 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970 |
| Badge Twins | Jaguar Mark 10 (alternate name); Jaguar 420G (1966–1970 rename) |
Common Mark X Repairs Covered
| System | Procedures |
|---|---|
| XK Engine Cooling | Thermostat replacement, water pump overhaul, and radiator flush procedures to address the XK engine’s known tendency toward overheating in stop-and-go driving |
| Lucas Electrical System | Complete wiring diagrams, fuse box layouts, dynamo/alternator testing, and ground point restoration for the notoriously problematic Lucas electrical components |
| Independent Rear Suspension | IRS subframe inspection, half-shaft seal replacement, and hub bearing adjustment — a common wear area on high-mileage Mark X examples |
| Borg-Warner Automatic Transmission | Fluid and filter service, kickdown cable adjustment, and band adjustment procedures for the Model 8 and Model 12 units |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Does this manual cover both the Mark X and the 420G?
Yes. Jaguar rebranded the Mark X as the 420G beginning with the 1966 model year. This manual covers the complete production run under both names — from the original 3.8L cars of 1961 through the final 4.2L 420G models built in 1970. All body styles and trim levels are included.
Which transmission variants are documented?
The manual covers three gearboxes: the Moss 4-speed manual, the early Borg-Warner Model 8 3-speed automatic, and the later Borg-Warner Model 12 automatic introduced mid-production. Full overhaul procedures, torque specs, and adjustment data are provided for each unit.
Are Lucas electrical wiring diagrams included?
Yes. The electrical section contains complete Lucas system wiring diagrams for all circuits — ignition, charging, lighting, starting, and accessories. Component specifications, wire color codes, connector locations, and fault-finding procedures are all documented to help diagnose the Mark X’s notoriously complex British electrics.
What format is the manual?
The manual is delivered as a fully searchable PDF, compatible with Windows, Mac, Linux, iOS, and Android devices. Individual pages can be printed for use in the workshop, and the file is available for instant download with lifetime re-download access.
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