The Jaguar XJS, produced from 1975 to 1996, stands as a timeless icon of British automotive engineering. With its sleek lines, powerful V12 engine (and later inline-six options), and luxurious grand touring capabilities, the XJS captured the hearts of enthusiasts worldwide. However, owning a classic like the XJS comes with the responsibility of regular maintenance to ensure it runs smoothly and retains its value. Neglecting key components can lead to common issues such as overheating, electrical failures, or suspension woes, which are all too familiar to XJS owners. In this comprehensive guide, we’ll explore the top Jaguar XJS parts essential for keeping your classic car in peak condition. Whether you’re a seasoned collector or a new owner, understanding these parts will help you avoid costly breakdowns and enjoy the open road.
One of the best ways to source authentic and high-quality components is through specialized suppliers. For instance, you can find a wide range of Jaguar XF Parts at, where catalogs are tailored specifically for models like the coupe, convertible, and V12 variants. These parts ensure compatibility and longevity, drawing from decades of expertise in Jaguar restoration.
Understanding the Jaguar XJS: A Brief Overview
Before diving into specific parts, it’s worth appreciating the XJS’s heritage. Launched as a successor to the legendary E-Type, the XJS featured a 5.3-liter V12 engine initially, delivering smooth power and a top speed exceeding 140 mph. Later models introduced a 3.6-liter AJ6 inline-six and an improved 4.0-liter version, along with refinements like better fuel injection and ABS brakes. However, the car’s complexity— with its Lucas electronics, intricate cooling system, and aging rubber components—means maintenance is crucial. Common problems include vacuum leaks causing rough idling, overheating from clogged radiators, and electrical gremlins from corroded grounds. By focusing on preventive replacements, you can mitigate these issues and keep your XJS purring like new.
Engine and Ignition System Parts: The Heart of Performance
The engine is the soul of any Jaguar, and for the XJS, maintaining it starts with the ignition system. Pre-1989 models, in particular, suffer from distributor problems that can lead to seized catalytic converters and even fires. A top priority is replacing the ignition distributor or upgrading to a more reliable aftermarket unit. Spark plugs and ignition coils should be inspected every 10,000 miles; fouled plugs can cause misfires, reducing fuel efficiency and power. Opt for high-quality NGK or Bosch plugs designed for V12 applications to ensure consistent spark.
Timing chains are another critical area. On both V12 and inline-six engines, worn chains produce a rattling noise at idle, signaling imminent failure. Replacing the timing chain kit—including chains, tensioners, and guides—is a must every 60,000-80,000 miles. This job often requires dropping the engine, so it’s best done during a major service. Fuel injection hoses also degrade over time, leading to leaks and fire hazards. Upgrading to modern, ethanol-resistant hoses is essential, especially if your XJS runs on today’s E10 fuel blends.
For sourcing these, Jaguar XJS Parts at sngbarratt include comprehensive engine kits that cover gaskets, seals, and hoses, making restoration straightforward.
Cooling System Components: Preventing Overheating Disasters
Overheating is perhaps the most notorious issue with the XJS V12, often resulting in blown head gaskets—a repair that can cost thousands. The original cooling system, with its dual-pass radiator, is prone to clogging from sediment and corrosion. Upgrading to a single-pass alloy radiator is a game-changer, improving heat dissipation and reliability. Pair this with a new thermostat (set to 82°C for optimal operation) and water pump to maintain consistent temperatures.
Hoses and belts in the cooling system should be replaced prophylactically. Cracked radiator hoses can burst under pressure, stranding you roadside. A full cooling overhaul might include expansion tanks, sensors, and fans. Electric fan conversions are popular mods for better airflow in traffic. Regular flushing of the coolant every two years prevents buildup, and using a 50/50 mix of antifreeze and distilled water is recommended.
Sites like the one offering Jaguar XJS Parts at sngbarratt stock alloy radiators and complete cooling kits, ensuring your XJS stays cool even on long drives.
Fuel System Essentials: Ensuring Reliable Delivery
The fuel system in the XJS is another hotspot for maintenance. Aging fuel pumps can fail intermittently, causing stalling or poor starting. Replacing the in-tank fuel pump and filter every 50,000 miles is advisable. Vacuum lines, which control fuel pressure and emissions, often crack with age, leading to rough running or high emissions. A complete vacuum hose kit addresses this, improving throttle response.
Fuel injectors on V12 models can clog from old gasoline, so periodic cleaning or replacement maintains efficiency. For carbureted early models (though rare), rebuilding the Zenith-Stromberg carbs is key. Always check the fuel tank for rust, especially in convertibles exposed to the elements.
Reliable Jaguar XJS Parts at sngbarratt include fuel system components tailored for your model’s year and engine type.
Suspension and Braking: For a Smooth and Safe Ride
The XJS’s independent rear suspension provides a supple ride, but worn bushings and ball joints lead to vague handling and noises. Polyurethane bushings offer a durable upgrade over rubber, enhancing steering precision without sacrificing comfort. Shock absorbers (dampers) should be replaced in pairs every 40,000 miles; Bilstein or Koni units are favorites among enthusiasts for better control.
Brakes are vital for safety. The XJS uses ventilated discs, but warped rotors from heat buildup are common. Upgrading to slotted or drilled rotors, along with high-performance pads like EBC Greenstuff, improves stopping power. Brake hoses can swell with age, reducing pedal feel—replace them with braided stainless steel lines for better response. Don’t forget the ABS sensors on later models; faulty ones trigger warning lights and compromise braking.
When shopping, Jaguar XJS Parts at sngbarratt cover suspension and brake categories, from bushings to full rebuild kits.
Electrical and Lighting: Banishing the Gremlins
Jaguar’s Lucas electrical systems earned the nickname „Prince of Darkness“ for good reason. Corroded ground points cause intermittent failures in lights, windows, and gauges. Cleaning every ground connection—there are dozens—is a weekend project that pays dividends. Relays for fuel pumps, fans, and starters often fail; stock up on spares.
Headlights on early XJS models are dim; upgrading to H4 halogen bulbs or LED conversions brightens the night. Battery maintenance is crucial—use a trickle charger for storage to prevent sulfation. Alternators should output 13.5-14.5 volts; weak ones strain the battery.
For electrical Jaguar XJS Parts at sngbarratt, you’ll find wiring harnesses and relays to restore reliability.
Body, Interior, and Accessories: Preserving Elegance
While mechanicals keep it running, body parts maintain the XJS’s allure. Rust around wheel arches and sills is common; replacement panels prevent spread. Chrome trim and badges fade—polishing or replacing them revives the look. Interior leather seats crack; conditioning with Lexol keeps them supple.
Accessories like floor mats, steering wheel covers, and luggage racks add practicality. For convertibles, top mechanisms need lubrication to avoid jams.
Jaguar XJS Parts at sngbarratt include body panels and interior trim for authentic restoration.
Maintenance Schedule and Tips for Longevity
To keep your XJS smooth, follow a schedule: oil changes every 3,000 miles with 10W-40 synthetic, annual coolant flushes, and biennial brake inspections. Store in a dry garage, use fuel stabilizers for winter, and drive regularly to prevent seals from drying.
Join forums like Jag-Lovers for community advice. Professional servicing for complex jobs ensures safety.
Conclusion: Invest in Quality for Enduring Enjoyment
Maintaining a Jaguar XJS rewards you with unparalleled driving pleasure. By prioritizing these top parts—from engine essentials to suspension upgrades—you’ll keep your classic running smoothly for years. Remember, quality matters; sourcing from trusted providers like those offering Jaguar XJS Parts at .sngbarratt ensures authenticity and fit. Whether cruising highways or attending shows, a well-maintained XJS is a joy forever.