Description
Factory Jaguar XJ12 Workshop Manual (1979–1992)
This factory-sourced workshop manual delivers complete service and repair coverage for the Jaguar XJ12 Series III across all fourteen model years sold in the US and globally, from the classic 1979 build through the final 1992 production run.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | 5.3L (5343cc) V12 HE — Lucas & Marelli electronic fuel injection |
| Diesel | N/A |
| Transmissions | GM400 3-speed automatic; Getrag 5-speed manual |
| Drive | RWD |
| Model Years | 1979–1992 |
| Badge Twins | XJ12 Sovereign, XJ12 Vanden Plas, Daimler Double Six (Series III) |
Common XJ12 Repairs Covered
| System | Procedures |
|---|---|
| V12 Cooling System | Coolant hose replacement, thermostat R&R, radiator overhaul — the XJ12 V12 is known for overheating when cooling components age |
| Lucas/Marelli Fuel Injection | Injector cleaning and replacement, fuel pressure regulator service, ECU diagnostics for rough-idle faults common to high-mileage V12s |
| Electrical System | Wiring harness inspection, relay and fuse box diagnosis, power window and seat circuit repair — a frequent concern on aging XJ12 examples |
| Suspension & Steering | Front/rear subframe bushing replacement, power steering pump R&R, wheel alignment specifications |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Which XJ12 body styles and trim levels does this manual cover?
The manual covers all Series III XJ12 variants built between 1979 and 1992, including the standard wheelbase sedan, long wheelbase sedan, XJ12 Sovereign, XJ12 Vanden Plas, and the Daimler Double Six badge twin. Both left-hand and right-hand drive configurations are addressed throughout.
Is the Daimler Double Six the same platform as the XJ12?
Yes. The Daimler Double Six Series III shares the same XJ platform, 5.3L V12 engine, and drivetrain as the Jaguar XJ12, differing primarily in badging and trim. This manual’s mechanical procedures apply directly to Double Six owners as well.
Does the manual cover the Lucas and Marelli fuel injection systems separately?
Yes. The fuel and engine management sections contain dedicated procedures for both the Lucas L-Jetronic system used in earlier production years and the Magneti Marelli digital fuel injection introduced later, including injector flow specs, idle mixture adjustment, and fault-finding charts.
What format is the manual?
The manual is a PDF file delivered via instant download after purchase. It is fully searchable, zoomable, and compatible with Windows, Mac, Linux, iOS, and Android devices. Individual pages or full sections can be printed for workshop use, and your download link remains active for lifetime re-downloads.
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