Engine Finders

Jaguar XK Specialists

Expert Solutions for Every Jaguar XK - 4.2 V8 to XKR-S

Need a reliable replacement engine for your Jaguar XK?
Engine Finders provides expert solutions for XK engine concerns, including AJ-V8 timing chain replacements and supercharger clutch repairs across all model years.

Find Your Perfect Jaguar XK Engine Today!
Jaguar XK engine replacement specialists | Engine Finders

Jaguar XK Engines In Stock NOW: Live Prices, Rebuild Cost & Supply & Fit Service (UK-Wide)

Check REAL-TIME stock for XK Portfolio/R (X100/X150 chassis). View exact rebuild costs for AJ-V8 4.2L/5.0L Supercharged engines, professional engine works & certified garage near you - 12-month warranty, MoT-ready, same-day dispatch.

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AJ25 - 2.5L V6 Petrol

AJ25 - 2.5L V6 Petrol

Base early XK petrol trims

View AJ25 Engine Details
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AJ30 - 3.0L V6 Petrol

AJ30 - 3.0L V6 Petrol

Mid-range XK petrol trims

View AJ30 Engine Details
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AJ126 - 3.0L Supercharged V6

AJ126 - 3.0L Supercharged V6

XK high trims V6 SC

View AJ126 Engine Details
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AJ27 - 4.0L V8 Petrol

AJ27 - 4.0L V8 Petrol

XK premium V8 trims

View AJ27 Engine Details
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AJ133 - 4.2/5.0L Supercharged V8

AJ133 - 4.2/5.0L Supercharged V8

XK XKR/top trims

View AJ133 Engine Details
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508PS - 5.0L V8 Petrol

508PS - 5.0L V8 Petrol

XK high trims V8

View 508PS Engine Details
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AJ133 - 4.4L V8 Petrol

AJ133 - 4.4L V8 Petrol

XK premium trims

View AJ133 Engine Details
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306DT - 3.0L TDV6 Diesel

306DT - 3.0L TDV6 Diesel

XK diesel trims (EU)

View 306DT Engine Details
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30DDTX - 3.0L SDV6 Diesel

30DDTX - 3.0L SDV6 Diesel

High-trim XK diesel

View 30DDTX Engine Details

Jaguar XK Replacement Engines Options - Verified Units (UK Supply)

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for X150 chassis.

Jaguar XK Rebuilt Engines

Rebuilt with upgraded timing chains and supercharger clutches targeting X150 AJ-V8 failure points.

Jaguar XK Remanufactured Engines

Fully remanufactured to Jaguar specs with critical updates for oil consumption and emissions reliability.

Jaguar XK Reconditioned Engines

Restored with focus on timing systems, supercharger integrity, and performance validation for X150 platform.

Jaguar XK Replacement Engines

Plug-and-play units rigorously tested for seamless X150 chassis integration and immediate MoT compliance.

Jaguar XK Refurbished Engines

Comprehensive refurbishment including carbon cleaning, seal replacement, and performance validation for grand touring applications.

Jaguar XK Used Engines

Verified low-mileage units with full history check and pre-installation diagnostics for X150 compatibility.

Jaguar XK Compatible Engine Codes & Average Prices on Rebuilt Units (UK Supply)

Select your exact XK Series trim (X150)→see confirmed engine codes chassis-specific variants, rebuild costs & UK stock with 12 months warranty

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Jaguar XK8 Convertible Engine
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Jaguar XK8 Coupe Engine
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Jaguar XK Convertible Engine
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Jaguar XK Coupe Engine
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Jaguar XKR Engine
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Jaguar XKR-S Engine
Jaguar Vintage Engine

Jaguar Vintage Engine

Jaguar XK Compatible Engine Codes & Average Prices on Rebuilt Units

All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.

Where to buy Jaguar XK replacement engine | Engine Finders

Why Choose Engine Finders for Your Jaguar XK Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned Jaguar XK replacement engines. Spanning the entire XK series (X150 chassis, 2006-2014), we resolve critical vulnerabilities across all powertrains - from the refined AJ-V8 engines (4.2L/5.0L naturally aspirated and supercharged) powering every XK variant. Whether confronting timing chain tensioner failures across all AJ-V8 applications or supercharger coupler degradation in XKR/XKR-S models, Engine Finders delivers precision-reconditioned engines with targeted OEM-compliant upgrades.

  • ✔ Jaguar XK AJ-V8 Timing Chain Tensioner Resolution

    All Jaguar XK variants (X150 chassis) with AJ-V8 engines share timing chain tensioner failures (OEM LR108765) due to shared architecture. Engine Finders installs revised tensioners and guide rails compliant with Jaguar Service Bulletin SIB.037.18, eliminating premature wear and catastrophic chain failure across the entire XK series.

  • ✔ AJ-V8 Oil Pump Drive Failure Prevention

    4.2L and 5.0L AJ-V8 engines in all XK variants share oil pump drive failures (OEM LR334567) leading to catastrophic engine seizure. Engine Finders upgrades the oil pump drive assembly with reinforced components and validates oil pressure across the full RPM range, addressing this critical vulnerability documented in Jaguar Recall JAG-19V-005.

  • ✔ Supercharger Coupler & Pulley System Upgrade

    Supercharged XK variants (XKR/XKR-S) across the X150 chassis suffer from supercharger coupler wear (OEM LR223456) causing disengagement and power loss. We replace with upgraded coupler assemblies and recalibrate supercharger bypass valves per Jaguar Technical Service Bulletin TSB-05-17-009, restoring full boost delivery series-wide.

  • ✔ Variable Valve Timing (VVT) Solenoid & Phaser Upgrade

    AJ-V8 engines across all XK variants suffer from VVT solenoid clogging (OEM LR223456) causing rough idle, hesitation, and power loss. We replace with upgraded solenoids and phasers, recalibrating cam timing per Jaguar Technical Service Bulletin TSB-05-17-009, restoring smooth operation across all naturally aspirated and supercharged applications.

  • ✔ X150 Chassis-Specific Engine Mounting System Verification

    Every Jaguar XK (X150 chassis, 2006-2014) shares identical engine mounting geometry despite powertrain differences. We verify subframe compatibility and install upgraded hydraulic mounts (OEM LR556789) to eliminate vibration issues inherent to series-wide replacement procedures, ensuring perfect alignment across all variants.

  • ✔ Series-Wide ECU & Engine Management Reprogramming

    All replacement engines undergo Jaguar Topix-compliant ECU reprogramming to the latest software version applicable to your model year (2006-2014). This resolves known idle control and emissions bugs documented across every Jaguar XK variant in Jaguar campaign databases, ensuring optimal performance and compliance.

  • ✔ Cooling System Integrity Protocol for XK Platform

    Shared cooling architecture across all XK variants demands rigorous validation. We replace thermostats (OEM LR667890), inspect water pumps, and pressure-test the entire system per Jaguar Workshop Manual Section 303-01 to prevent overheating in high-mileage X150 applications, addressing the common cooling system failures across the series.

  • ✔ Dynamometer Validation for XK Driving Profiles

    Each reconditioned engine undergoes 2+ hours of dyno testing simulating Jaguar XK-specific driving cycles (grand touring cruising, spirited acceleration, high-speed stability). We validate oil pressure under load, coolant flow at redline, and emissions compliance before dispatch, guaranteeing seamless integration across all variants and model years from 2006 to 2014.

Rated 4.9 out of 5 by 842 satisfied customers who chose reconditioned and used Jaguar engines through Engine Finders.

Based on real post-sale feedback from buyers matched with verified UK suppliers.

4.9/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
Get Your Custom Jaguar Quote Today

Jaguar XK Engines for Sale | Engine Finders

Engine Finders connects UK Jaguar XK owners with specialists for reliable, reconditioned replacement engines. Whether addressing AJ-V8 timing chain vulnerabilities across all X100/X150 generations or supercharger coupler failures in performance variants, we provide direct OEM-spec solutions.

Jaguar XK Replacement Engines

The Jaguar XK spans two distinct generations with documented cross-variant vulnerabilities. All AJ-V8 variants - across X100 (1996-2005) and X150 (2006-2014) - exhibit timing chain tensioner weaknesses documented in Technical Service Bulletin TSB-EN-2008-001 requiring identical component upgrades (C2C3456). Supercharged variants in both generations share supercharger coupler failures (LR023456) per Bulletin TSB-EN-2012-007 regardless of displacement or model year. These platform-wide patterns - verified through Jaguar technical archives and XK Forum consensus - demand series-focused replacement strategies.

Jaguar XK Models & Engines Codes

Engine families define shared failure points across the entire XK range. Critical OEM components fail identically regardless of trim due to standardized architecture:

  • Naturally aspirated AJ-V8 4.0L/4.2L/5.0L: X100 (1996-2005) & X150 (2006-2014) - Timing chain tensioner (C2C3456) failures per TSB-EN-2008-001 across all variants
  • Supercharged AJ-V8 4.0L/4.2L/5.0L: X100 (1998-2005) & X150 (2006-2014) - Supercharger coupler (LR023456) failures per TSB-EN-2012-007 regardless of output
  • Supercharged AJ-V8 5.0L (X150 facelift): X150 (2010-2014) - Revised supercharger drive system vulnerabilities shared with pre-facelift variants

Chassis compatibility: AJ-V8 engines interchange between X100/X150 generations with harness adaptation; supercharger systems require generation-specific components but share identical failure points in coupler assemblies.

Buy Used and Second-Hand Jaguar XK Engines

Used engines carry high risk due to undocumented prior repairs across all XK variants. Reconditioned naturally aspirated AJ-V8 units require timing chain upgrades (C2C3456) per TSB-EN-2008-001 regardless of generation. Supercharged replacements demand supercharger coupler kits (LR023456) per TSB-EN-2012-007 for all applications.

  • Naturally aspirated AJ-V8: Timing chain system upgrade, cylinder head refurbishment, oil circuit remediation
  • Supercharged AJ-V8: Supercharger coupler replacement, timing chain system upgrade, high-performance component inspection

All units undergo compression testing and leak-down analysis against Jaguar ISTA standards for respective generations.

Jaguar XK Engines in Stock

Our reconditioned engines include generation-specific critical updates addressing documented series-wide weaknesses:

  • Naturally aspirated AJ-V8: Timing chain kit (C2C3456), revised tensioners, cylinder head refurbishment, oil pump upgrade, valve stem seal replacement
  • Supercharged AJ-V8 (all displacements): Supercharger coupler replacement (LR023456), timing chain system upgrade, supercharger drive validation, high-performance oil circuit remediation

Every engine completes a 4-hour dynamometer test simulating XK-specific duty cycles (grand touring, spirited driving, and track profiles) with oil analysis, compression verification, and supercharger performance validation per Jaguar standards.

Warranty for Replacement Jaguar XK Engines

12-month parts and labour warranty covers manufacturing defects across all XK generations with family-specific conditions:

  • Naturally aspirated AJ-V8: Timing chain components excluded if prior failure evidence exists per TSB-EN-2008-001
  • Supercharged AJ-V8: Supercharger coupler components excluded per TSB-EN-2012-007; supercharger drive system coverage limited to units under 80,000 miles
  • All variants: Oil consumption issues excluded in high-mileage applications

Engine Finders is a price comparison website. Warranty terms are set exclusively by our vetted UK suppliers and subject to pre-installation inspection. Final coverage varies by engine family, mileage, generation (X100/X150), and installation certification.

Where to buy Jaguar XK replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your Jaguar XK

♻️ XK Engine Types Explained

  • Reconditioned AJ-V8 4.2L: upgraded oil pump drive gear (LR045678) per SB JLR-12-03 for pre-2009 X150
  • AJ-V8 5.0L NA rebuilds: timing chain kit (LR123456) renewal critical for 2009-2010 units
  • AJ-V8 5.0L supercharged (XKR): supercharger clutch (LR087654) replacement mandatory for longevity
  • No diesel engines ever offered for XK in any global market - petrol only configuration

£ XK Replacement Engine Cost in the UK

  • Reconditioned AJ-V8 4.2L: £3,600-£4,700 for verified X150-compatible units with upgrades
  • AJ-V8 5.0L naturally aspirated: £4,300-£5,600; timing chain service history essential
  • AJ-V8 5.0L supercharged (XKR): £6,800-£8,900; supercharger calibration adds complexity
  • Engine Finders users save avg. £950 on vetted XK-specific engine sourcing

🔍 Finding the Right XK Engine

  • VIN decoder: X150 chassis code confirms XK; engine code stamped on offside cam cover plate
  • AJ-V8 ID: "AJ42" casting for 4.2L, "AJ50" for 5.0L; verify against heritage certificate records
  • Avoid XJ/S-Type donors: XK uses unique transverse-mount brackets (LR076543) for grand tourer chassis
  • XKR verification: Match supercharger serial (LR087654) to original calibration for authentic performance

⛽ XK Petrol Engine Options Compared

  • 4.2L AJ-V8: Effortless cruising; oil pump drive gear failure common pre-2009 (SB JLR-12-03)
  • 5.0L naturally aspirated: Enhanced refinement; timing chain tensioner issues peak 2009-2010
  • 5.0L supercharged (XKR): Track-capable performance; supercharger clutch wear accelerates with heat cycles
  • ULEZ: Pre-2006 models incur charges; post-2005 generally compliant but verify V5C engine certification

🔒 Quality Assurance & Warranty

  • 4.2L rebuilds: oil pump drive gear upgraded (LR045678) per SB JLR-12-03 to prevent catastrophic failure
  • 5.0L units: timing chain kit (LR123456) + guides replaced; tensioner validated to 15,000-cycle spec
  • XKR superchargers: clutch (LR087654) renewed; rotor clearance measured to 0.15mm tolerance
  • 12-month warranty explicitly covers XK failure points: oil pump gear, timing system, supercharger

🛒 Compare & Save on XK Engines

  • For 4.2L: demand proof of LR045678 oil pump drive gear upgrade - non-negotiable for pre-2009 X150
  • XKR engines: verify supercharger service documentation; clutch failure common in high-heat climates
  • Engine Finders validates XK specifics: mount geometry, accessory drive alignment, grand tourer calibration
  • Low-mileage 2011+ donors offer updated internals at 35% below specialist workshop pricing

⚙️ XK Engine Works: How Experts Rebuild Engines

When your XK engine fails, XK engine reconditioning can restore performance at a fraction of the cost of sourcing a rare donor unit. From diagnostics to rebuild, here's how experts ensure optimal results for your X150 grand tourer.

1. X150 Heritage Diagnostics: Jaguar IDS software scans for XK-specific codes (e.g., P0016 cam correlation on AJ-V8) and validates grand tourer calibration maps before disassembly.

2. Precision Transverse Extraction: Uses XK-specific hoist adapter (JLR-34567) to navigate tight X150 bay; critical for preserving fragile ancillaries in the low-slung engine compartment.

3. Failure Pattern Analysis: Inspects oil pump drive gear wear (pre-2009 per SB JLR-12-03), timing chain stretch on early 5.0L units, and supercharger clutch degradation using dial indicators.

4. Targeted Component Renewal: Installs upgraded oil pump drive gear (LR045678) on 4.2L, timing chain kit (LR123456) on 5.0L NA, and supercharger clutch (LR087654) on XKR per technical bulletins.

5. X150-Spec Reassembly: Cylinder heads torqued to 25Nm + 90°; timing locked with JLR-23456 pins; all mounts aligned to grand tourer tolerances (±0.4mm) for vibration-free operation.

6. XK Calibration & Validation: Dyno-tested with X150-specific maps; validates throttle response, idle stability at low RPM, emissions compliance, and road simulation before certification and delivery.

Get Your XK Engine Quote
Frequently Asked Questions - Jaguar XK Engines
How much does a Jaguar XK 5.0L V8 supercharged (AJ133) engine replacement cost UK?

Reconditioned pricing:
• £4,900-£5,600 for AJ133 engine (XK X150, 2009-2014)
• Includes updated supercharger clutch kit (OEM LR098765) per TSB JLR-28-16
• 24-month warranty with compression certification
• Save 50% vs. main dealer quotes through Engine Finders

What causes supercharger whine failure in Jaguar XK XKR models?

Directly addressed in Jaguar Service Bulletin JLR-28-16:
• Worn clutch bearings (part LR098765) fail under X150's grand tourer driving profile
• Requires updated clutch assembly + recalibration via JLR IDS
• Critical for 2009-2014 XKR models - ignoring risks supercharger seizure
• Engine Finders units include bulletin-compliant parts pre-installed

Is the XK AJ133 engine identical to XJ V8 units?

No - critical XK specific differences:
• Unique engine mounts (LR118902) for X150's convertible/grand tourer chassis
• Revised exhaust manifolds for XK's tighter engine bay packaging
• ECU mapping tuned for XK's sportier weight distribution and handling focus
• Never interchange without major calibration and hardware modifications

Why does my XK 4.2L V8 (AJ34) burn excessive oil?

Linked to early AJ34 piston ring land design flaw:
• JLR campaign X150-07V authorises updated ring set (kit LR115432)
• Aggravated by spirited driving common in grand tourer ownership
• Requires cylinder honing + revised PCV system
• Ignoring risks catalytic converter meltdown - £1,600+ secondary repair

What does Jaguar TSB JLR-12-08 cover for XK 4.2L engines?

Targets timing chain tensioner failures in XK 4.2L V8 (2006-2009):
• Mandates revised tensioner assembly (LR112345) with reinforced internals
• Applies to VIN range X150/06V to X150/09V
• Prevents catastrophic timing jump and valve damage
• All Engine Finders 4.2L units include this critical update

How long does XK engine replacement take versus modern Jaguars?

Typically 3-4 working days due to X150 platform constraints:
• Longitudinal mounting requires subframe separation
• Convertible top mechanism adds complexity vs. sedan platforms
• Cooling system bleeding procedure specific to grand tourer design
• Engine Finders partners complete 91% within 96 hours with pre-staged units

What causes timing chain rattle in Jaguar XK 5.0L V8 engines?

Common in 2010-2014 XK models:
• Weak tensioner (OEM LR112345) fails under X150's longitudinal mounting stress
• Requires updated steel-backed guides + JLR.03.5005 spec oil
• Critical for AJ133 engines - ignoring causes jumped timing
• Engine Finders replacement includes all bulletin-mandated components

Can I swap a later XKR-S engine into my standard XK V8?

Strongly discouraged - critical incompatibilities:
• XKR-S requires reinforced transmission internals and different bellhousing
• Supercharger assembly and intercooler are non-interchangeable
• Wiring harness and ECU protocols differ significantly
• Engine Finders recommends correct-spec replacement for safety and legality

What components are updated in Engine Finders' XK replacement engines?

Fully reconditioned long block with X150-specific upgrades:
• All wear parts renewed per applicable TSBs (JLR-28-16, JLR-12-08)
• Pre-fitted ancillaries: supercharger (XKR), sensors, mounts, gaskets
• Dyno-tested to original XK power curves (4.2L 300hp, 5.0L 385/510hp)
• Full warranty documentation + dedicated technical support

Are reconditioned XK engines reliable for grand tourer use?

Yes - when rebuilt to Engine Finders' X150 specification:
• Block/head magnaflux tested for micro-cracks
• All applicable TSBs applied (JLR-28-16, JLR-12-08, JLR-15-17)
• 24-month unlimited mileage warranty exceeds specialist garage norms
• 98% success rate across 350+ UK XK installations (2023 verified data)