🏷️ Basic Information Identification Make: Jaguar Model: 420 / 420G Production Years Covered: 1966-1970 Codes Vin Structure Notes: VIN structure evolved during this period, manual covers variations. 👋 Introduction Market Position Segment: Luxury Executive Saloon, distinct from Jaguar's sports cars but sharing engineering. Target Audience: Buyers seeking a comfortable, powerful, and stylish luxury vehicle with a sporting edge. Competitive Analysis Key Competitors: Rover P5B, Daimler 2.5 V8/250, Bentley 'S' Type, Mercedes-Benz W108/W109. Key Features Design Philosophy: Elegant styling, powerful XK engine, comfortable ride, and sophisticated handling for its era. Model Distinction: The 420/420G represented a more performance-oriented and luxurious iteration compared to the Mark 2, bridging the gap to the XJ6. 📋 Manual Details Coverage Areas Primary Coverage: Comprehensive mechanical, electrical, and bodywork service and repair. Additional Coverage: Includes troubleshooting, diagnostics, and specifications for all major systems. Page Count Estimated Page Count: Approx. 500-700 pages (variable depending on specific edition/format) Manual Type Type: Workshop Service and Repair Manual Language Language: English Format Format: Digital (likely PDF, printable) 📖 Manual Coverage Systems Covered Engine: XK Series Inline-6 (3.8L, 4.2L), including carburetion (SU/Zenith Stromberg), ignition, cooling, lubrication, and exhaust. Transmission: Manual (Moss/Jaguar Gearbox), Automatic (Borg-Warner Model 8 / Model 35). Drivetrain: Rear-wheel drive, differential, half-shafts, driveshaft. Suspension: Front independent (double wishbone, torsion bars), Rear independent (semi-trailing arms, coil springs). Brakes: Girling Hydraulic Disc Brakes (front and rear), Handbrake mechanism. Steering: Burman Recirculating Ball Power Steering (optional/standard depending on model/market). Electrical: 12V System, Lucas components (alternator/dynamo, starter, ignition, lighting, wiring diagrams). Fuel System: Fuel tanks, pumps (mechanical/electric), lines, carburettor setup. Bodywork And Chassis: Body shell construction, panels, doors, windows, trim, upholstery. Procedures Included Maintenance: Routine servicing, lubrication schedules, fluid changes, filter replacements. Repair: Engine overhaul, gearbox rebuilds, brake caliper overhaul, suspension component replacement. Troubleshooting: Diagnostic charts for common faults, symptom-based analysis. Diagnostics: Ignition timing, carburettor tuning, electrical circuit testing. Installation Adjustment: Component fitting, alignment procedures, calibration. Technical Depth Depth: Comprehensive, suitable for professional mechanics and experienced DIY enthusiasts. Detail Level: Includes detailed diagrams, torque specifications, clearances, and exploded views. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable for efficient information retrieval. Print Quality Printability: Designed for clear printing of text and diagrams. Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Family: Jaguar XK Inline-6 Engine Codes: 4.2 Litre (e.g., 7007/7009 series for 420G, similar for 420 with potentially minor differences). Displacement Litres: 4.2 L Bore X Stroke Mm: 92.07 x 106.0 mm Compression Ratio: 8.0:1 or 9.0:1 (depending on variant) Performance Horsepower Bhp: Approx. 245 bhp (420G), Approx. 265 bhp (420 - higher compression, dual exhaust) Torque Lb-Ft: Approx. 285 lb-ft (420G), Approx. 280 lb-ft (420) Fuel System Carburettors: Twin SU HD6 (420) or Triple SU HD8 (420G). Fuel Type: Premium Unleaded Gasoline (Octane rating appropriate for era, leaded initially). Engine Management Ignition System: Lucas Distributor with points and coil. 🔧 Transmission Standard Transmission Type: 4-speed Manual with Overdrive (Laycock de Normanville Type GH) often standard on 420. Optional Transmission Type: 3-speed Automatic (Borg-Warner Model 35, often standard on 420G). Features Overdrive Operation: Electric switch control for engaging/disengaging overdrive. Fluid Specifications Manual Transmission Fluid: GL4 Gear Oil, e.g., SAE 80/90 (check manual for precise type). Automatic Transmission Fluid: Dexron II or equivalent (check manual for precise type). 📐 Dimensions Exterior Wheelbase Inches: 107.25 inches Length Inches: 187.5 inches Width Inches: 66 inches Height Inches: 55 inches Weights Curb Weight Lbs: Approx. 3700 - 3900 lbs (depending on transmission and equipment) Wheels And Tires Wheel Size: 15 inch steel wheels, wire spoke option. Bolt Pattern: 5 x 4.5 inch (5x114.3mm) Tire Size: Typically 185 HR 15 or 205/70 HR 15 (check manual for specific OE fitment). 🛡️ Safety Features Ratings Crash Test Data: No modern standardized crash test data available for this era; built to contemporary standards. Active Features Braking System: Girling hydraulic disc brakes on all four wheels, power-assisted. Steering Features: Optional power steering for improved maneuverability. Passive Features Seatbelts: Lap belts often standard; shoulder belts may have been optional or fitted later. Construction: Unitary body construction (monocoque) with subframes for engine/suspension. 💡 Technology Features Infotainment Audio System: Period-correct AM/FM radio, likely Lucas or similar period manufacturer. Cassette players and later upgrades may exist. Dashboard Controls: Classic analogue instrumentation, central dashboard layout with heater and ventilation controls. Driver Assistance Parking Aids: None originally fitted; parking sensors are aftermarket additions. Cruise Control: Optional on some models, typically mechanical systems. Connectivity Original Connectivity: N/A (No electronic connectivity in the modern sense). 🔧 Maintenance Service Intervals Oil Change: Every 3,000 miles or 6 months (recommendation, check manual for exact spec). Grease Points: Regular lubrication of suspension and steering components (e.g., every 1,000-2,000 miles). Tune Up: Periodic checks of ignition timing, carburettor synchronization, and valve clearances. Fluid Specifications Engine Oil Capacity Litres: Approx....