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Jaguar Xj6 (Series 3)

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Jaguar XJ6 Series 3: A Comprehensive Guide

The Jaguar XJ6 Series 3, produced from 1979 to 1992, represents the culmination of the original XJ design, refined over three generations. A full-size luxury saloon, it competed with the likes of Mercedes-Benz S-Class and BMW 7 Series, offering a blend of British elegance, sporting character, and advanced engineering for its time. Often praised for its styling and comfortable ride, it remains a desirable classic despite its well-documented reliability quirks.

Generations

  • Series 1 (1968-1973): The original XJ6, featuring a groundbreaking independent rear suspension and sleek, low-slung styling. Engines included 2.8L and 4.2L inline-sixes.
  • Series 2 (1973-1979): A facelifted version with a raised front bumper for US crash regulations and a more prominent grille. Introduced the XJ12 with a V12 engine.
  • Series 3 (1979-1992): The final and most enduring iteration. Redesigned by Pininfarina, it featured a more modern, formal appearance with a raised roofline, slimmer bumpers, and integrated taillights. Available with 3.4L and 4.2L inline-six engines, and later the 2.9L and 3.6L AJ6 engine.

Reliability & Common Issues

While the XJ6 Series 3 offers a luxurious and rewarding experience, potential buyers should be aware of its well-known reliability issues. Regular maintenance and careful inspection are crucial.

Engine

  • Cooling System: Overheating is a common problem. Check for leaks in the radiator, hoses, and water pump. Blocked coolant passages can also cause issues. The thermostat should be regularly replaced.
  • Carburation/Fuel Injection: Early Series 3 models with carburetors can suffer from tuning issues and fuel leaks. Later models with Lucas fuel injection are generally more reliable, but injectors can become clogged, and the fuel pump can fail.
  • Oil Leaks: The inline-six engine is prone to oil leaks, particularly from the valve cover gasket, crankshaft seals, and oil pan gasket.
  • AJ6 Engines (2.9L and 3.6L): Introduced later in the Series 3 run, these engines are generally more robust than the earlier units, but can suffer from head gasket failures and timing chain tensioner issues.

Transmission

  • Borg-Warner Transmissions: The earlier models used Borg-Warner transmissions (BW66 and BW65). These are generally reliable but can wear out over time. Ensure smooth shifting and no excessive slippage. Rebuilding may be necessary on higher-mileage examples.
  • GM400 Transmission: Later models often featured the GM400 transmission. This is a very robust transmission, however, it is still subject to age related wear.

Electrical System

  • Lucas Electricals: Historically, Lucas electrical systems have been a source of frustration. Check for faulty wiring, corroded connections, and malfunctioning switches. Pay close attention to the operation of lights, wipers, and electric windows. A thorough electrical system overhaul may be necessary on older examples.
  • Charging System: The alternator and battery should be in good working order. Check the charging voltage and look for signs of corrosion around the battery terminals.

Suspension & Brakes

  • Independent Rear Suspension: While offering excellent ride quality, the IRS can be complex and expensive to repair. Check for worn-out bushings, leaks from the differential, and unusual noises.
  • Brakes: Ensure the brakes are working properly and that the pads and rotors are in good condition. The hydraulic system can be prone to leaks.

Body & Interior

  • Rust: Rust is a major concern, especially in areas prone to moisture. Check the floors, sills, wheel arches, and around the headlights and taillights.
  • Interior: The interior trim can be fragile. Look for cracked wood veneer, worn leather seats, and damaged carpets. Replacement parts can be expensive.
  • Air Conditioning: The air conditioning system can be unreliable and expensive to repair. Check that it blows cold air and that all components are functioning correctly.

Driving Experience

The Jaguar XJ6 Series 3 offers a unique driving experience characterized by its smooth ride, comfortable interior, and graceful styling. It's a car that prioritizes comfort and refinement over outright performance, though the 4.2L engine offers ample power for most situations.

Pros:

  • Comfortable Ride: The independent suspension provides a smooth and compliant ride, absorbing bumps and imperfections in the road with ease.
  • Elegant Styling: The Pininfarina-designed exterior is timeless and elegant, turning heads wherever it goes.
  • Luxurious Interior: The interior is appointed with high-quality materials, including leather, wood veneer, and plush carpeting.
  • Smooth Engine: The inline-six engine is renowned for its smoothness and refinement.

Cons:

  • Reliability Issues: As discussed above, the XJ6 Series 3 is prone to a variety of mechanical and electrical problems.
  • Running Costs: Maintenance and repairs can be expensive.
  • Fuel Economy: Fuel economy is poor, especially with the larger engines.
  • Age: Being a classic car, finding parts and qualified mechanics can be challenging.

Buying Advice

Buying an XJ6 Series 3 requires careful consideration. Here's some advice to help you make an informed decision:

Years to Look For:

  • Later Models (1983-1992): Generally, the later models are considered more desirable due to improvements in build quality and the availability of the more modern AJ6 engine.
  • Fuel-Injected Models: Fuel-injected models are generally more reliable and easier to maintain than carbureted versions.

What to Avoid:

  • Rusty Examples: Avoid cars with significant rust, as repairs can be costly and time-consuming.
  • Cars with Neglected Maintenance: Look for cars that have been well-maintained and have a documented service history.
  • Cars with Major Mechanical Problems: Avoid cars with obvious mechanical problems, such as engine knocking, transmission slipping, or excessive smoke.
  • Cheap Examples: Often, the cheapest examples will require significant investment to bring them up to a reasonable standard. It's usually better to pay more for a well-maintained car.

Key Checks:

  • Thorough Inspection: Have the car inspected by a qualified mechanic who is familiar with Jaguars.
  • Check for Rust: Pay close attention to the areas mentioned above.
  • Test Drive: Take the car for a test drive and pay attention to the engine, transmission, suspension, and brakes.
  • Review Service History: Examine the service history for evidence of regular maintenance and repairs.
  • Check Electrics: Ensure all electrical components are functioning correctly.

The Jaguar XJ6 Series 3 can be a rewarding classic car to own, offering a blend of luxury, style, and driving pleasure. However, potential buyers should be aware of its reliability issues and be prepared to invest time and money in maintenance and repairs. With careful research and a thorough inspection, you can find a well-maintained example that will provide years of enjoyment.

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