How much does a Jaguar XJ 5.0 V8 engine replacement cost-

A fully rebuilt Jaguar XJ 5.0 V8 engine typically costs between £8,000 and £12,000 for supply only, while reconditioned units start from £5,500. Used verified donor units are available from £3,000. Rebuilt AJ133 units include upgraded timing components and 12-month warranty. Specialist supply and fit labour typically adds £910-£1,170. Main dealer quotes frequently exceed £14,000, making specialist replacement highly cost-effective.

What are the signs of timing chain failure in a Jaguar XJ 5.0 V8-

Early signs of timing chain wear in the AJ133 5.0L V8 include a distinct metallic rattling or knocking noise from the front of the engine, especially during cold starts. Metallic rattling on startup indicates advanced tensioner wear. Sudden loss of power or check engine lights with cam timing codes. Ignoring these symptoms can lead to catastrophic internal engine seizure.

Is it worth replacing the engine in a Jaguar XJ 5.0 V8-

Yes, replacing the engine is typically worthwhile given the car's retained value. A rebuilt unit costs £8,000-£12,000 versus £14,000+ dealer quotes, preserving a flagship saloon worth £8,000-£25,000. XJ 5.0 V8 values remain strong; well-maintained examples retain significant worth post-repair. Specialist rebuilt engines include upgraded components addressing original OEM failure points. Minimum 12-month unlimited mileage warranty provides financial protection post-replacement.

What is the difference between the AJ133 and AJ133SC engines-

The AJ133 is the 5.0L naturally aspirated V8 producing 385hp, while the AJ133SC is the supercharged variant producing 470-550hp for XJR and Supersport trims. Both share the same core block and timing vulnerabilities. AJ133SC requires additional supercharger coupler and isolator monitoring. Rebuilt pricing reflects V8 complexity and supercharged premium. Both engines benefit from upgraded metal timing guides during specialist rebuilds.

How long does a Jaguar XJ 5.0 V8 engine replacement take-

A complete Jaguar XJ 5.0 V8 engine replacement typically requires 3-5 working days for specialist supply & fit, including removal, calibration, coolant bleed, and road testing. Complex aluminium architecture and supercharger access extend labour time versus mainstream models. ECU adaptation requires Jaguar-specific diagnostic equipment post-fit. Nationwide specialist network enables local fitting without main dealer appointment delays.

What warranty comes with a reconditioned Jaguar XJ 5.0 V8 engine-

All reconditioned and rebuilt Jaguar XJ 5.0 V8 engines supplied through EnginesMarket include a minimum 12-month unlimited mileage warranty covering parts and labour for manufacturing defects. Warranty applies to both parts and labour when using a network specialist. Upgraded internal components (like revised timing chains) are specifically covered. Keep all service records and invoices to maintain warranty validity.

Jaguar XJ 5.0 V8 Specialists

Jaguar XJ 5.0 V8 Engine Replacement Compare Prices & Get Quotes

Get quotes today from trusted UK Jaguar XJ 5.0 V8 engine specialists. Compare prices on reconditioned, rebuilt and used engines for the 5.0L AJ133 V8, ensuring precision engineering and reliable performance for your flagship executive saloon.

Supply & Fit Available

12-Month Warranty

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Jaguar XJ 5.0 V8 Engine

from£8,000 to £12,00...

Usedfrom £3,000
Reconditionedfrom £5,500
Common codesAJ133, AJ133SC, 508PN

Jaguar xj 5.0 V8 Used Engine — AJ133 / 508PN

Jaguar xjUsed Engine — AJ133 / 508PN

Jaguar xj 5.0 V8 Reconditioned Engine — AJ133 / 508PN

Jaguar xjReconditioned Engine — AJ133 / 508PN

Jaguar xj 5.0 V8 Rebuilt Engine — AJ133 / 508PN

Jaguar xjRebuilt Engine — AJ133 / 508PN

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How it works

3 Simple Steps to Finding the Right Replacement Engine

Clear information first, then the right engine and specialist for your exact vehicle.

Variant History

Jaguar XJ 5.0 V8 Engine History & Specs at a Glance

When the 5.0 V8 launched in the XJ range for the 2010 model year (X351 generation), it replaced the previous 4.2L unit, delivering 385hp naturally aspirated and up to 550hp supercharged in XJR and Supersport trims. Throughout its production run, the engine architecture remained consistent, though critical timing and cooling components received factory revisions.

2010
AJ133 / 508PN, 5.0L V8 Naturally Aspirated, 385hp, launched in the X351 generation.
2010
AJ133SC, 5.0L V8 Supercharged, 470-510hp, introduced for XJR and Supersport variants.
2013
Revised timing chain guides and tensioners implemented to address early wear patterns.
2019
Final production year for the Jaguar XJ 5.0 V8, concluding the X351 generation.

Every engine fitted to the Jaguar XJ 5.0 V8 is covered below, with UK rebuilt pricing and known failure points for this flagship V8 powertrain.

Engine Codes & Pricing

Jaguar XJ 5.0 V8 Engine Codes Specifications & Replacement Cost

Find your exact engine code, specs and UK replacement cost guide.

AJ133 / 508PN — 5.0L Petrol Naturally Aspirated (2010-2019)

Power Output: 385hp
Years Fitted: 2010-2019

Can’t find your exact engine code?-> Get quotes for AJ133 Jaguar XJ 5.0 V8 engine replacement

-> Get quotes for AJ133 Jaguar XJ 5.0 V8 engine replacement

Common failure points and repair options

Timing Chain Tensioner Failure

Affected: Jaguar XJ 5.0 V8 (AJ133, AJ133SC, 2010-2012)
Typical failure mileage: 60,000-100,000 miles

Root cause

Original hydraulic tensioners lose pressure and plastic guide rails wear under heat cycles, allowing chain slack that leads to rattling on cold starts and potential timing jumps or valve collision.

Repair options

Repair tier	Dealer price	Specialist price
Minor - Preventative Chain Kit Replacement	£2,500-£3,500	£1,500-£2,200
Full Replacement - rebuilt/reconditioned engine	£14,000-£18,000	£8,000-£12,000 [EM-QUOTE]

Our recommendation

If you hear a brief diesel-like rattle only on cold starts, replace the chain kit immediately with upgraded metal guides. Once the rattling persists under load, internal damage is already done. A rebuilt AJ133 with factory-corrected tensioners is the most cost-effective path forward.

-> Compare rebuilt AJ133 Jaguar XJ 5.0 V8 engine prices

Coolant Crossover Pipe & Supercharger Coupler Degradation

Affected: Jaguar XJ 5.0 V8 (AJ133SC, 2010-2019)
Typical failure mileage: 60,000-120,000 miles

Root cause

Factory composite plastic coolant pipes become brittle from prolonged exposure to high under-bonnet temperatures, leading to sudden coolant loss. On supercharged models, the Eaton supercharger isolator coupler fatigues, causing a distinctive metallic rattle and reduced boost efficiency.

Repair options

Repair tier	Dealer price	Specialist price
Minor - Preventative Pipe & Coupler Upgrade	£1,200-£2,000	£700-£1,200
Full Replacement - rebuilt/reconditioned engine	£15,000-£20,000	£9,000-£13,000 [ESTIMATED - using AJ133 as proxy]

Our recommendation

The plastic coolant system and supercharger coupler are ticking time bombs on high-mileage XJ 5.0 V8s. Replacing them proactively during routine servicing is highly cost-effective. If overheating has already occurred, a rebuilt engine is the only acceptable repair to maintain the vehicle's value and reliability.

-> Compare rebuilt AJ133SC Jaguar XJ 5.0 V8 engine prices

Don't Let Engine Failure Write Off Your Jaguar XJ 5.0 V8

Whether your Jaguar XJ 5.0 V8 is struggling with timing chain stretch or cooling system degradation, the financial decision between repeated dealership repairs and a complete engine replacement is straightforward. EnginesMarket connects you with trusted UK Jaguar specialists who supply fully rebuilt 5.0L V8 engines featuring upgraded internal components that permanently address the original design vulnerabilities. Every unit comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and optional supply & fit packages, allowing you to bypass main dealer markups and return to the road with confidence.

Compare Jaguar XJ 5.0 V8 Engine Replacement Prices Now ->

FAQ

Jaguar XJ 5.0 V8 Engine ReplacementFrequently Asked Questions

Everything Jaguar XJ 5.0 V8 owners usually ask before choosing a rebuilt, reconditioned or used replacement engine.

A fully rebuilt Jaguar XJ 5.0 V8 engine typically costs between £8,000 and £12,000 for supply only, while reconditioned units start from £5,500. Used verified donor units are available from £3,000.

Rebuilt AJ133 units include upgraded timing components and 12-month warranty.
Specialist supply and fit labour typically adds £910-£1,170.
Main dealer quotes frequently exceed £14,000, making specialist replacement highly cost-effective.

-> Compare rebuilt Jaguar XJ 5.0 V8 engine prices from UK specialists

Early signs of timing chain wear in the AJ133 5.0L V8 include a distinct metallic rattling or knocking noise from the front of the engine, especially during cold starts.

Metallic rattling on startup indicates advanced tensioner wear.
Sudden loss of power or check engine lights with cam timing codes.
Ignoring these symptoms can lead to catastrophic internal engine seizure.

-> Get urgent Jaguar XJ 5.0 V8 engine diagnostics before catastrophic failure occurs

Yes, replacing the engine is typically worthwhile given the car's retained value. A rebuilt unit costs £8,000-£12,000 versus £14,000+ dealer quotes, preserving a flagship saloon worth £8,000-£25,000.

XJ 5.0 V8 values remain strong; well-maintained examples retain significant worth post-repair.
Specialist rebuilt engines include upgraded components addressing original OEM failure points.
Minimum 12-month unlimited mileage warranty provides financial protection post-replacement.

-> Find out if your Jaguar XJ 5.0 V8 is worth engine replacement - get a tailored quote

The AJ133 is the 5.0L naturally aspirated V8 producing 385hp, while the AJ133SC is the supercharged variant producing 470-550hp for XJR and Supersport trims. Both share the same core block and timing vulnerabilities.

AJ133SC requires additional supercharger coupler and isolator monitoring.
Rebuilt pricing reflects V8 complexity and supercharged premium.
Both engines benefit from upgraded metal timing guides during specialist rebuilds.

-> Compare AJ133 and AJ133SC Jaguar XJ 5.0 V8 engine replacement quotes side by side

A complete Jaguar XJ 5.0 V8 engine replacement typically requires 3-5 working days for specialist supply & fit, including removal, calibration, coolant bleed, and road testing.

Complex aluminium architecture and supercharger access extend labour time versus mainstream models.
ECU adaptation requires Jaguar-specific diagnostic equipment post-fit.
Nationwide specialist network enables local fitting without main dealer appointment delays.

-> Find Jaguar XJ 5.0 V8 engine supply & fit specialists with fast turnaround near you

All reconditioned and rebuilt Jaguar XJ 5.0 V8 engines supplied through EnginesMarket include a minimum 12-month unlimited mileage warranty covering parts and labour for manufacturing defects.

Warranty applies to both parts and labour when using a network specialist.
Upgraded internal components (like revised timing chains) are specifically covered.
Keep all service records and invoices to maintain warranty validity.

-> View Jaguar XJ 5.0 V8 reconditioned engine warranty terms and compare specialist coverage options

Why Choose Us

Compare Jaguar XJ 5.0 V8 Engine Prices Today

Comparing quotes is free, no-obligation, and specific to your exact Jaguar XJ 5.0 V8 and engine code. Don't risk your premium executive saloon with unverified parts; connect with vetted UK specialists who understand the unique demands of the 5.0L AJ133 V8 and can get you back on the road with complete peace of mind.

100+100+ Jaguar XJ 5.0 V8 engines supplied through our network

12-Month12-Month Unlimited Mileage Warranty on every rebuilt Jaguar XJ 5.0 V8 engine

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