Jaguar 420 (1966-68)

COMMON FAULTS
Please Note: Common Faults in Regularly Used Vehicles vs. Low-Mileage Stored Vehicles that have been used consistently over many years, accumulating approximately 10,000–12,000 miles annually, are more prone to common faults due to regular wear and tear. These issues typically arise from the natural aging of components subjected to frequent use, such as engine parts, suspension systems, brakes, and tires. In contrast, vehicles with low mileage that have been stored or preserved are likely to experience different types of issues. These vehicles are often better maintained to ensure their longevity and may avoid some of the typical wear-and-tear problems seen in regularly driven cars. However, they can still face unique challenges such as degradation of rubber seals, corrosion from prolonged inactivity, or fuel system issues caused by old or stagnant fuel.

The **Jaguar 420**—a classic beauty that often flies under the radar! Let's dive into what you should know about this elegant machine.

1. **Overview of the Jaguar 420 and Daimler Sovereign:**
- The **Jaguar 420** (and its close relative, the **Daimler Sovereign**) was the final evolution of the original Mk2 Jaguar. It made its debut in 1966.
- Think of it as the sophisticated offspring of the S-type and the Mk2. It inherited the Mk2 cabin, independent rear suspension, and a longer tail. Plus, it sported a MkX-style front end, wrapping around the most powerful engine that could fit in this compact Jag.
- The 420 was a bit of a trailblazer—it had features that would later appear in the iconic XJ6. Power steering, servo brakes, and a magic-carpet ride made it a joy to drive. And those luxurious leather seats? Pure comfort.
- Fun fact: The 420 was the first Daimler model to be powered by a Jaguar engine. Fancy, right?

2. **Common Faults and What to Look For:**
- **Rust**: Like many classics, rust has been the 420's nemesis. When inspecting one, pay close attention to panel fit and use a magnet to uncover any filled areas.
- **Engine**: The 4.2-liter XK engine is a workhorse, but it's not immune to issues. Keep an eye out for:
- **Internal Corrosion**: If antifreeze hasn't been used diligently, waterways can clog in the block and radiator. This can lead to localized overheating and, eventually, head gasket failure.
- **Emulsion on Oil Cap**: Check for creamy emulsion on the oil cap or oil mixing with water—signs of trouble.
- **Head Corrosion and Cracking**: In severe cases, the head can corrode or crack.
- **Engine Number**: The correct engine number starts with 7F (for Jaguar) or 7A (for Daimler).
- **Oil Leaks**: Some oil seepage is normal, but significant losses (especially from the rear of the unit) should raise concerns.

3. **Driving Experience**:
- Mechanically, the 420 is a delight. It can trundle along in third or fourth gear, but when you need that "get-up and go," it delivers.
- Picture yourself cruising down the road, feeling both regal and sporty. That's the 420 experience!
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Generations/Trim Levels
Please Note: Generations and Trim Levels Across Countries
Generations and trim levels of vehicles often vary between countries as manufacturers tailor models to meet the preferences and requirements of specific markets. For example, a trim level designated as “GL” in the UK might be labelled as “XS” in another country. Due to these regional differences, the information provided on this site pertains exclusively to UK-specific products.

1. **Origins and Evolution:**
- The story of the **Jaguar 420** (pronounced "four-twenty") and its Daimler Sovereign counterpart takes us back to the iconic **Jaguar Mark 2**, which made its debut in 1959 and graced the roads throughout most of the swinging '60s. The Mark 2 featured a live rear axle and was powered by the legendary XK six-cylinder engine—the same one that first roared in the Jaguar XK120 back in 1948.
- Now, let's unravel the automotive lineage:
- **Mark 2**: Available in 2.4, 3.4, and 3.8-liter engine capacities, the Mark 2 set the stage for what was to come.
- **Mark X and E-Type**: In 1961, Jaguar introduced two new models—the Mark X saloon (pronounced "mark ten") and the sleek E-Type sports car. Both flaunted versions of Jaguar's new independent rear suspension. The Mark X had a wider track, while the E-Type was more nimble.
- **Jaguar S-Type**: In 1963, the S-Type stepped onto the scene. It was essentially a development of the Mark 2, but with a twist—a new intermediate-width independent rear suspension, extended rear bodywork, and a slightly plusher interior. The S-Type rocked either a 3.4 or 3.8-litre XK engine (twin carburettor form, mind you).
- **420/Sovereign**: Finally, we arrive at the 420 and its Daimler sibling. These were produced from 1966 to 1968 as the ultimate expression of Jaguar's "compact sporting saloons." The 420/Sovereign shares its wheelbase with its predecessors but adds a touch of refinement. It's essentially an S-Type with a more linear front end, matching its rear styling. Picture a curvaceous nose made sleeker, and you're there!

2. **The Ultimate Expression:**
- The 420/Sovereign was the swan song of this lineage—a harmonious blend of elegance, power, and sophistication. With its 4.2-liter XK engine, power steering, and magic-carpet ride, it truly embodied the spirit of Jaguar.
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Trim Levels
1. **Jaguar 420**:
- The standard **Jaguar 420** was a delightful blend of elegance and performance. Here's what you'd find:
- **Body Style**: A sleek four-door saloon (sedan) with classic lines and that unmistakable Jaguar grace.
- **Engine**: Powered by the robust 4.2-liter XK engine, which was known for its smoothness and reliability.
- **Features**: Inside, it pampered its lucky occupants with luxurious leather seats, power steering, servo brakes, and a magic-carpet ride. Yes, you read that right—a magic carpet! (Okay, maybe not literally, but it felt that way.)
- **Sophistication**: The 420 was the logical evolution from the S-Type, combining the Mk2 cabin, independent rear suspension, and a longer tail. Plus, it sported a MkX-style front end, wrapping around that powerful engine.

2. **Daimler Sovereign**:
- The Daimler version of the 420, known as the **Daimler Sovereign**, added a touch of exclusivity. Here's what set it apart:
- **Badging**: The Sovereign wore its Daimler badge proudly, signalling its elevated status.
- **Interior Trim**: While mechanically similar to the Jaguar 420, the Sovereign differentiated itself with aspects of interior trim. Imagine sumptuous materials and refined details—the kind that make you feel like royalty.
- **Upmarket Appeal**: The Sovereign was positioned as the upmarket model, and it succeeded the Majestic Major. It stayed in production until 1969, bridging the gap until the XJ6-based Sovereign arrived.

3. **Why Choose a 420 or Sovereign?**:
- Well, my friend, if you buy a well-sorted 420 or Sovereign, you're essentially driving the best compact 1960s Jaguar (or Daimler) without breaking the bank. It wafts along effortlessly, lulling passengers to sleep on those long journeys. Your family will thank you!
- Just be mindful of rust (the eternal enemy of classics) and choose wisely. A good one is a bargain, but a rusty wreck can be financially daunting to restore.
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Engine
The 420/Sovereign was graced with none other than the venerable **4.2-litre XK engine**. Picture it: a straight-six powerhouse, humming with British engineering finesse. Here are the juicy details:

- **Cylinder Head**: It flaunted a straight port cylinder head, ensuring efficient airflow and optimal combustion.
- **Camshaft Goodness**: Lift cams measuring a delightful 3/8 inch (that's about 9.5 mm for our metric friends) added a touch of performance magic. Lift those valves, my friend!
- **Compression Ratios**: Now, here's where it gets interesting. Depending on the local fuel quality (because, you know, petrol varies like a fine wine), you could specify one of three compression ratios:
- **7:1**: For those who preferred a gentle, laid-back ride—like sipping tea in the countryside.
- **8:1**: A balanced choice—neither too hot nor too cold. Just right, like Goldilocks' porridge.
- **9:1**: The spicy option! If you wanted a bit more zest, this was your ticket. Zoom-zoom!

And how did they achieve these different ratios? By playing with the crown design of the pistons. Imagine a tiny crown tailor-fitted to each piston, whispering, "Go forth and compress, my noble steed!"
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Performance
Under those sleek lines and polished chrome, the 420 was no slouch. Here's the lowdown on its performance:

- **Engine**: The heart of the 420 was a 4.2-litre XK inline-six engine. Picture it: double overhead cams, a symphony of cylinders, and a penchant for spirited driving.
- **Power Output**: This beauty churned out a respectable **245 bhp** (or **248 PS** if you prefer metric units) at a rev-happy **5500 rpm**. That's the kind of power that makes your heart skip a beat when you press the accelerator.
- **Torque**: Torque, my friend, is what pushes you back into those plush leather seats. The 420 delivered a maximum torque of **384 N·m** (or **283 lb·ft** if you're feeling imperial) at a smooth **3750 rpm**.
- **Acceleration**: Now, let's talk about that exhilarating sprint. Under test conditions, the 420 could gracefully glide from **0 to 60 mph** in under **10 seconds**. Not bad for a sophisticated saloon, eh?
- **Top Speed**: And when you needed to stretch its legs, the 420 would happily whisk you away at a top speed of over **125 mph** (that's around **201 km/h** for our globe-trotting friends). Imagine the wind tousling your hair as you cruise along.
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Rivals
In 1966, the main rivals to the Jaguar 420 offered the following performance:

- **Austin A105 Westminster**: The Austin A105 Westminster had a 2.6-litre engine producing around 102 horsepower. It could reach a top speed of approximately 100 mph and accelerate from 0-60 mph in about 18 seconds.
- **Rover P5 3-Litre**: The Rover P5 3-Litre featured a 3.0-litre engine producing around 121 horsepower. It had a top speed of about 113 mph and could accelerate from 0-60 mph in around 14 seconds.
- **Ford Zephyr Mk II**: The Ford Zephyr Mk II was equipped with a 2.6-litre engine producing around 86 horsepower. It had a top speed of about 88 mph and could accelerate from 0-60 mph in around 17 seconds.
- **Vauxhall Cresta PA**: The Vauxhall Cresta PA had a 2.7-litre engine producing around 94 horsepower. It could reach a top speed of approximately 93 mph and accelerate from 0-60 mph in about 18 seconds.

These performance figures reflect the competitive landscape of mid-sized executive cars during that era.
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Designer/Dimensions
The Jaguar 420 was designed by Sir William Lyons, the founder of Jaguar Cars. He was known for his keen eye for aesthetics and played a significant role in shaping the elegant lines and overall design of the car - Wikipedia](https://en.wikipedia.org/wiki/Jaguar_420_and_Daimler_Sovereign_%281966%E2%80%931969%29).

As for its dimensions, the Jaguar 420 had the following measurements:
- **Wheelbase**: 107.4 inches (2,727 mm)
- **Length**: 187.5 inches (4,762 mm)
- **Width**: 67.0 inches (1,702 mm)
- **Height**: 56.3 inches (1,429 mm)
- **Kerb weight**: 3,695 lbs (1,676 kg) - Wikipedia](https://en.wikipedia.org/wiki/Jaguar_420_and_Daimler_Sovereign_%281966%E2%80%931969%29).
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Spares/Specialists NI
When it comes to keeping your beloved **Jaguar 420** in tip-top shape, sourcing quality spares is like finding the perfect bowtie for a tuxedo—essential and oh-so-classy. Let's explore some options for you:

1. **SCParts.co.uk**:
- If you're after a treasure trove of Jaguar parts, SCParts.co.uk is your go-to. They specialize in British cars, including the **Jaguar Mk10 and 420G** (which, as you know, evolved into the 420).
- From harmonic balancers to cylinder head gaskets, they've got you covered. Need brake pads or a water pump? They've got those too. And if you're feeling particularly adventurous, they even offer competition parts and accessories. Vroom vroom!
- Adrian Starr, their specialist, is probably the automotive equivalent of a wizard. You can reach out to him at **Adrian@SCParts.co.uk** for all your 420-related inquiries.

You can explore their offerings [here](https://www.scparts.co.uk/en/jaguar/jaguar-mk10-and-420g-1961-1970/).

2. **EU-SPARES**:
- For a European twist, EU-SPARES has a parts catalogue specifically for the **Jaguar Mk X (420G)**. It's like a digital candy store for car enthusiasts.
- Browse through their selection, select your motorization, and let the magic happen. It's like online shopping for car parts—minus the queues and awkward fitting room lighting.

Check out their catalogue [here](https://www.euspares.co.uk/original-parts/jaguar/mk/mk-x). May the automotive deities guide your clicks!

3. **247 Spares**:
- If you prefer the comfort of your armchair (who doesn't?), 247 Spares is your virtual pit stop. They stock thousands of Jaguar parts, and you can order them online. No need to leave the house—just sip your tea and click away.
- Imagine the joy of having those shiny new parts delivered directly to your door. It's like Christmas morning, but with more grease on your hands.
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Specialists NI
When it comes to pampering your cherished **Jaguar 420**, finding the right specialist garage is like discovering a secret garden for classic car enthusiasts. Here are a few in both Northern Ireland and the Republic of Ireland:

1. **Stephen Groves Jaguar Specialist** (Northern Ireland):
- Imagine a place where Jaguars are treated like royalty. Well, that's exactly what you'll find at **Stephen Groves Jaguar Specialist**. These folks have been whispering sweet nothings to Jaguars for over **30 years**—that's more than a fling; it's a committed relationship.
- **Where**: They're nestled in the scenic landscapes of Northern Ireland, covering areas like **Belfast, Hillsborough, and Lisburn**.
- **What They Do**: From regular servicing to dealer-level diagnostics, they've got your back. Autologic diagnostic equipment? Check. Key tuning? Check. Software upgrades? Check. Basically, they're the automotive equivalent of a spa day for your Jag.
- **Testimonials**: Customers sing their praises, like Leslie Johnston, who says, "I have no hesitation in recommending him for all your Jaguar needs." And Ian? Well, he's all about that "first-class service."
- **Membership**: They're part of the **Institute of The Motor Industry**—fancy, right?

2. **Blakely Vehicle Services** (Northern Ireland):
- Gareth Blakely, the **Independent Jaguar Specialist**, knows Jaguars like a poet knows verses. Established in **2015**, he's become the go-to guru for all things Jaguar in Northern Ireland.
- **Experience**: With over **15 years** under his belt, Gareth has seen it all—from minor repairs to full engine rebuilds. And guess what? He's got the magic touch for sourcing both new genuine Jaguar parts and pre-loved gems.
- **Where**: You'll find Blakely Vehicle Services in **Belfast**—a city where Jaguars roam freely, probably discussing their latest oil change over afternoon tea.

3. **Blakely Vehicle Services** (Republic of Ireland):
- Yes, Gareth Blakely's magic extends beyond Northern Ireland. If you're south of the border, fret not! His expertise reaches the Republic of Ireland too.
- **Where**: Well, it's still Blakely Vehicle Services, but this time, think of lush green landscapes, cozy pubs, and a pint of Guinness. Yep, that's the Republic of Ireland.
- **Why Choose Gareth?**: Because when your Jaguar needs attention, Gareth doesn't just fix it; he whispers sweet nothings to its engine. And that's the kind of love your 420 deserves.
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Racing
The **Jaguar 420** (pronounced "four-twenty") and its Daimler Sovereign counterpart were produced for a brief period at the end of the 1960s. These elegant machines were the ultimate expression of a series of "compact sporting saloons" offered by Jaguar throughout that decade. But did they ever hit the racetrack?

1. **Origins and Heritage**:
- The 420/Sovereign traces its lineage back to the iconic **Jaguar Mark 2**, which graced the roads from 1959 onward. The Mark 2 was powered by the legendary XK six-cylinder engine—the same one that first roared in the Jaguar XK120 back in 1948.
- In 1961, Jaguar introduced two new models: the **Mark X** saloon (pronounced "mark ten") and the sleek **E-Type** sports car. Both featured versions of Jaguar's new independent rear suspension. The Mark X had a wider track, while the E-Type was more nimble.
- Meanwhile, in 1963, the Jaguar S-Type stepped onto the scene. It was essentially a development of the Mark 2, with a new intermediate-width independent rear suspension, extended rear bodywork, and a slightly plusher interior.

2. **The 420/Sovereign's Racing Story**:
- While the 420/Sovereign wasn't explicitly designed for racing, it inherited some of the sporting DNA from its predecessors.
- However, these cars were more about elegance, comfort, and spirited road driving than outright track performance. Their magic lay in wafting along effortlessly, making long journeys a joy.
- So, you won't find epic tales of the 420 conquering the Nürburgring or Monaco Grand Prix. Instead, it preferred the open road, where it could stretch its legs and serenade its passengers with that XK engine symphony.

3. **Legacy and Appreciation**:
- Enthusiasts cherish the 420/Sovereign for its refined styling, luxurious interior, and smooth ride. It's like attending a black-tie event with a hidden pocket for a racing stopwatch.
- While it didn't chase checkered flags, it did win hearts—especially those of classic car aficionados who appreciate its understated elegance.
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Valuation
The value of a Jaguar 420 in the UK today can vary depending on the condition, mileage, and history of the car. Here are some approximate values based on recent listings:

- **Well-maintained examples**: Around £9,658
- **Restored or upgraded models**: Up to £38,192

These values are approximate and can vary based on the specific car and its history.
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Clubs
Jaguar owner clubs do exist in Northern Ireland! One notable club is the [Jaguar Enthusiasts' Club](https://jec.org.uk/regions/ni), which has a Northern Ireland region. They organize monthly outings, social events, and various activities for Jaguar owners and enthusiasts.

Another club is the [Jaguar Drivers' Club Area 30](https://www.jaguardriver.co.uk/areas/northern-ireland), which also caters to Jaguar owners in Northern Ireland. They hold meetings and events where like-minded Jaguar enthusiasts can gather and enjoy the social side of the club.
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