Positioning:
Luxury executive sedan
Competitors:
Mercedes-Benz S-Class, BMW 7 Series, Rolls-Royce Silver Spirit
Design Philosophy:
Combination of traditional Jaguar elegance with modern technology and improved build quality
Manual Advantage:
Empowers owners and independent workshops with dealer-level diagnostic and repair capabilities
Powertrain:
Engine, transmission, drivetrain, cooling system, fuel system, exhaust system
Chassis:
Suspension (front and rear), steering system, braking system (including ABS for applicable models)
Electrical:
Complete wiring diagrams, ignition system, lighting, charging system, starting system, instrumentation, audio system, climate control electronics
Body:
Bodywork repairs, interior trim, glass, seals, doors, locks, windows
Maintenance:
Scheduled maintenance, oil changes, filter replacements, tune-ups, fluid level checks, lubrication
Repair:
Engine overhaul, transmission repair, brake component replacement, suspension rebuild, electrical component diagnosis and repair, body panel repair
Diagnostics:
Fault finding, troubleshooting guides, diagnostic trouble codes (DTCs) where applicable
Special Procedures:
Engine timing, clutch replacement, differential service, power steering system service
Depth:
Comprehensive, from basic maintenance to full engine and transmission rebuilds
Detail Level:
Step-by-step instructions, detailed diagrams, exploded views
Engine Type:
Inline 6-cylinder, DOHC
Engine Code 1986:
AJ6 (3.6L)
Engine Code Later Models:
AJ6/AJ16 (4.0L)
Displacement 3.6L:
3590 cc
Displacement 4.0L:
3980 cc
Horsepower 3.6L Est:
217-221 hp @ 5000 rpm
Torque 3.6L Est:
230-235 lb-ft @ 3500 rpm
Horsepower 4.0L Est:
237-245 hp @ 4750-5000 rpm
Torque 4.0L Est:
277-285 lb-ft @ 3600-3750 rpm
Injection Type:
Electronic Fuel Injection (EFI), typically multi-point
Fuel Type:
Unleaded gasoline
ECU System:
Jaguar electronic engine management system (various iterations throughout production)
Transmission Type:
4-speed automatic (ZF 4HP22)
Manual Option:
Rare, available on some early 3.6L models (Getrag 5-speed manual)
Automatic Modes:
Standard, Sport, Economy modes on later models
Automatic Transmission Fluid:
Refer to manual for specific Dexron III or equivalent (consult manual for exact specifications per year/model)
Wheelbase:
Approx. 113.1 inches (2873 mm)
Length:
Approx. 196.8 - 200 inches (5000 - 5080 mm) depending on model year
Width:
Approx. 70.9 inches (1800 mm)
Height:
Approx. 53.9 inches (1370 mm)
Curb Weight:
Approx. 3700 - 4000 lbs (1678 - 1814 kg)
Gross Vehicle Weight Rating:
Refer to vehicle data plate/manual
Crash Test Ratings:
N/A for era, but designed to high safety standards for its time
ABS:
Standard on most later models, optional on earlier ones
Airbags:
Driver's airbag introduced in 1990 model year, passenger airbag later
Seatbelts:
Inertia reel seatbelts with pre-tensioners (on later models)
Body Structure:
Reinforced safety cell, crumple zones
Oil Change Interval:
Typically 5,000-7,500 miles or annually (refer to manual for specific recommendation)
Major Service:
Recommended at higher mileages (e.g., 30,000, 60,000 miles) for comprehensive checks and replacements
Engine Oil:
API SG/SH or equivalent, SAE 10W/30 or 10W/40 (check manual for ambient temperature suitability and specific viscosity)
Coolant:
Ethylene glycol-based antifreeze, typically a 50/50 mix with distilled water. Consult manual for specific type and capacity.
Brake Fluid:
DOT 3 or DOT 4, check manual for specific requirement
Power Steering Fluid:
Refer to manual, often a specific type of hydraulic fluid
Electronics:
Early models had issues with the JEC (Jaguar Electronic Control) system, instrument cluster problems ('Carlsson' or 'black death' on some digital displays), and ABS warning lights.
Cooling System:
Corrosion in the aluminum radiator, water pump failures, and thermostat issues.
Suspension:
Wear in suspension bushings, ball joints, and potential issues with the self-leveling rear suspension (if equipped).
Body Corrosion:
Rust can be a significant issue, particularly around wheel arches, sills, and the subframes.
Jaguar Legacy:
Jaguar Cars has a long history of producing luxurious and performance-oriented grand tourers and sedans.
Xj40 Development:
The XJ40 was a significant departure from the previous XJ-S and Series III XJ, featuring a more modern monocoque construction and a completely new design.
Key Upgrades:
Introduction of the 4.0L AJ6/AJ16 engine, improved build quality, ABS, driver's airbag, and updated interior features over its lifespan.
Production Period:
1986-1994
Manufacturing Plant:
Castle Bromwich, Birmingham, UK
