Segment:
Luxury Saloon / Grand Tourer
Era:
1960s Luxury Automotive
Competitors:
Rolls-Royce Silver Cloud, Bentley S-Series, Mercedes-Benz 300SE, Cadillac DeVille.
Design Philosophy:
Elegant styling, powerful straight-six engines, sophisticated independent suspension, and luxurious interiors.
Target Audience:
Affluent buyers seeking performance, luxury, and a refined driving experience.
Engine:
3.8L and 4.2L XK inline-6 engines, including disassembly, assembly, tuning, and troubleshooting.
Fuel System:
Carburetor systems (e.g., SU HD6, Zenith-Stromberg), fuel pumps, tanks, lines, and filters.
Cooling System:
Radiator, water pump, thermostat, hoses, and fan operation.
Transmission:
Manual (Moss/Jaguar Gearbox) and Automatic (e.g., Borg-Warner DG250) transmissions, including overhaul and adjustment.
Clutch:
Hydraulic clutch system, clutch disc, pressure plate, and release bearing.
Drivetrain:
Propeller shaft, universal joints, rear axle assembly, differential, and half-shafts.
Suspension:
Front independent suspension (wishbones, coil springs, dampers), rear independent suspension (semi-trailing arms, hubs, dampers).
Steering:
Power-assisted steering (Burman or Marles Varamatic), steering box, column, and linkages.
Brakes:
Girling disc brakes (front and rear), hydraulic system, master cylinder, brake calipers, and fluid specifications.
Wheels Tyres:
Wheel types, tyre sizes, pressures, and servicing.
Bodywork:
Body construction, panel repair, doors, bonnet, boot lid, glass, and trim.
Exhaust System:
Exhaust manifolds, pipes, mufflers, and hangers.
Heating Ventilation:
Heating system (heater matrix, blower), ventilation controls.
Electrical System:
Wiring diagrams, lighting, ignition system, charging system (generator/alternator), starting system, instrumentation, horn, wipers.
Maintenance:
Scheduled maintenance tasks, lubrication, fluid changes, filter replacements, tune-ups.
Repair Overhaul:
Detailed procedures for disassembly, inspection, repair, and reassembly of all major mechanical and electrical components.
Troubleshooting:
Diagnostic guides, common problems and their solutions, fault finding charts.
Specifications:
Torque values, clearances, fluid capacities, timing settings, electrical specifications.
Parts Identification:
Parts identification, part numbers, and diagrams for ordering and referencing.
Depth:
Comprehensive, covering from routine maintenance to complete engine and gearbox rebuilds, and detailed electrical system diagnosis.
Engine Type:
Inline 6-cylinder, DOHC (Double Overhead Camshaft)
Engine Codes Mk10:
XK 380 (3.8L), XK 420 (4.2L)
Engine Codes Stype:
XK 380 (3.8L)
Displacement Litres 3 8:
3.8 Litres
Bore Stroke 3 8 Mm:
87.0 mm x 111.1 mm
Compression Ratio 3 8:
8.0:1 or 8.5:1 (depending on spec)
Horsepower 3 8 Bhp:
Approx. 220-265 bhp @ 5500 rpm (depending on carburetor setup)
Torque 3 8 Lb Ft:
Approx. 240-260 lb-ft @ 4000 rpm
Displacement Litres 4 2:
4.2 Litres
Bore Stroke 4 2 Mm:
92.1 mm x 106.0 mm
Compression Ratio 4 2:
8.5:1 or 9.0:1
Horsepower 4 2 Bhp:
Approx. 265-280 bhp @ 5500 rpm
Torque 4 2 Lb Ft:
Approx. 283-290 lb-ft @ 4000 rpm
Carburetors:
Typically twin SU HD6 (3.8L) or triple SU HD8 / Zenith-Stromberg CD175 (4.2L)
Fuel Type:
Premium Unleaded Gasoline
Oil Change Interval Miles:
Every 3,000-5,000 miles (typical for the era, consult manual for precise recommendations).
Grease Points Interval Miles:
Regularly (e.g., every oil change) for chassis lubrication points.
Engine Oil Type:
API SF/CD rated multi-viscosity oil, e.g., 20W-50 or 10W-40 depending on climate.
Engine Oil Capacity Litres:
Approx. 6.8 Litres (7.2 US Quarts) with filter.
Coolant Type:
Ethylene Glycol based antifreeze (50/50 mix with distilled water).
Brake Fluid Type:
DOT 3 or DOT 4 Hydraulic Brake Fluid.
Transmission Oil Manual Type:
GL-4 Gear Oil (e.g., SAE 90).
Transmission Oil Auto Type:
Dexron III / Mercon Automatic Transmission Fluid (or equivalent).
Differential Oil Type:
Hypoid Gear Oil (EP, SAE 90).
Rust Corrosion:
Prone to rust, particularly in wheel arches, sills, and door bottoms.
Engine Oil Leaks:
Valve cover gaskets, oil sump gaskets, and front/rear main seals can be sources of leaks.
Cooling System:
Radiator core degradation, water pump seals, and heater matrix leaks are common.
Electrical Reliability:
Wiring harnesses can degrade, Lucas components are known for occasional unreliability; proper maintenance is key.
Suspension Wear:
Bushings, ball joints, and damper seals can wear over time, affecting ride and handling.
Carburetor Tuning:
Requires regular adjustment and balancing for optimal performance and fuel economy.
Jaguar Legacy:
Jaguar Cars Ltd. renowned for performance sports cars and elegant saloons, building on the legacy of Sir William Lyons.
Mk10 Development:
Evolved from the Mk IX saloon, intended as a larger, more luxurious flagship. Replaced the Mk IX and was the largest Jaguar saloon of its time. Renamed 420G in 1966.
Stype Development:
Launched in 1963 as a smaller, sportier alternative to the Mk 10, sharing its engine and rear suspension but with a distinct bodyshell.
Manufacturing Location:
Coventry, England
Mk10 Production Years:
1961-1966 (Mk 10), 1966-1970 (420G)
Stype Production Years:
1963-1968
