This comprehensive 1981 Jaguar XJ (XJ40) Service and Repair Manual provides detailed instructions and illustrations for maintaining, servicing, diagnosing, and repairing your vehicle. It is the same manual used by technicians at Jaguar dealerships, ensuring accurate and reliable information.

The manual covers all models and repairs, including:

* **Maintenance:** Routine maintenance procedures such as oil changes, filter replacements, and inspections.
* **Engine:** Detailed information on the engine, including its components, operation, troubleshooting, and repair procedures.
* **Control System:** Explanations of the vehicle's electronic control systems, including diagnostics and repair.
* **Mechanical:** Covers the mechanical aspects of your vehicle, such as the transmission, drivetrain, suspension, brakes, and steering.
* **Fuel Service Specifications:** Provides specifications and instructions for working on the fuel system, including fuel injection and emissions control.
* **Emission Control:** Details on the vehicle's emission control systems, diagnostics, and repairs.
* **Intake Exhaust Cooling:** Information on the intake, exhaust, and cooling systems, including troubleshooting and repair procedures.
* **Lube:** Details on lubrication systems, fluids, and recommendations.
* **Ignition Starting Charging:** Explanations of the ignition, starting, and charging systems, including troubleshooting and repair procedures.
* **Auto Transmission Clutch:** Information on the automatic transmission, including operation, diagnostics, and repair.
* **Manual Transmission:** Details on the manual transmission, including operation, diagnostics, and repair.
* **Transfer Propeller Shaft:** Information on the transfer case, propeller shaft, and related components.
* **Drive Shaft:** Details on the drive shaft, including inspection, repair, and replacement.
* **Differential:** Information on the differential, including operation, diagnostics, and repair.
* **Axle Suspension:** Information on the axle and suspension systems, including diagnostics and repair.
* **Tire & Wheel:** Details on tires and wheels, including specifications, inspections, and repairs.
* **Brake Control:** Explanations of the brake control systems, including diagnostics and repair.
* **Brake:** Covers the brake system, including operation, diagnostics, and repair.
* **Parking Brake:** Information on the parking brake system, including operation, diagnostics, and repair.
* **Steering Column:** Details on the steering column, including operation, diagnostics, and repair.
* **Power Steering:** Explanations of the power steering system, including operation, diagnostics, and repair.
* **Air Condition:** Information on the air conditioning system, including operation, diagnostics, and repair.
* **Suppl Restraint System:** Details on the supplemental restraint system (airbags), including operation and maintenance.
* **Seat Belt:** Information on the seat belt system, including operation, diagnostics, and repair.
* **Engine Immobilizer:** Explanation of the engine immobilizer system, including operation and diagnostics.
* **Cruise Control:** Details on the cruise control system, including operation, diagnostics, and repair.
* **Wiper & Washer:** Information on the windshield wipers and washer system, including operation, diagnostics, and repair.
* **Door Lock:** Details on the door lock system, including operation, diagnostics, and repair.
* **Meter Audio/Visual:** Explanations of the instrument cluster, gauges, and warning lights.
* **Horn:** Information on the horn system, including operation, diagnostics, and repair.
* **Windshield/Glass Mirror:** Details on the windshield, glass, and mirrors, including replacement procedures.
* **Instrument Panel:** Information on the instrument panel, including operation, diagnostics, and repair.
* **Seat:** Details on the seats, including adjustments, repairs, and upholstery.
* **Engine Hood/ Door:** Information on the engine hood and doors, including operation, diagnostics, and repair.
* **Exterior & Interior:** Covers the exterior and interior of the vehicle, including details on trim, bodywork, and upholstery.
* **Electrical:** Information on the electrical system, including wiring diagrams, troubleshooting, and repair.
* **Multiplex/ Can Communication:** Explanations of the vehicle's multiplex and CAN communication systems.

This manual provides comprehensive information for all aspects of your 1981 Jaguar XJ (XJ40), allowing you to perform repairs and maintenance with confidence.

The 1981 Jaguar XJ (XJ40), a landmark in automotive history, marked the fourth generation of the iconic XJ series. Unveiled in 1986, it brought a wealth of innovations and refinements to the classic Jaguar design, solidifying its reputation for luxury and performance. This generation was a stark departure from its predecessors, boasting a completely new platform, distinct styling, and advanced engineering. While still carrying the elegant lines and graceful silhouette that defined the XJ, the XJ40 featured a more angular and modern aesthetic, characterized by its flush-fitting windows, raked headlights, and distinctive grille. Underneath this refined exterior lay a robust structure built with extensive use of galvanized steel, significantly enhancing its durability and resistance to corrosion.

The heart of the XJ40 was its engine lineup, which included a powerful 3.6-liter AJ6 inline six-cylinder engine, later upgraded to a 4.0-liter variant. This engine, renowned for its smooth operation and impressive torque, was offered in both naturally aspirated and turbocharged configurations. The XJ40 also introduced a unique and innovative independent rear suspension system that delivered exceptional handling and ride comfort. This system, consisting of a multi-link design with coil springs and gas-filled shock absorbers, provided a remarkable balance between sporty handling and a refined ride, a testament to Jaguar's engineering prowess. Furthermore, the XJ40 was equipped with a host of electronic advancements, including an electronic fuel injection system, a digital instrument cluster, and a sophisticated anti-lock braking system, underscoring Jaguar's commitment to pushing the boundaries of automotive technology.