Jaguar Xj X351 Engine Replacement - Rebuilt & Reconditioned Units from £4,000

Source genuine OE-spec engines from vetted UK specialists. Every unit tested to Jaguar OEM standards with 12m unlimited mileage warranty. Compare quotes & save up to 60% online.

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Engine Finders

Jaguar XJ Specialists

Expert Solutions for Every X351 Engine - 3.0L to 5.0L

Need a reliable replacement engine for your Jaguar XJ X351?
Concerned about common timing chain tensioner failures affecting performance and longevity? Engine Finders is the UK's #1 marketplace for high-quality Jaguar engines, connecting you with trusted suppliers offering durable solutions.

Find Your Perfect Jaguar XJ Engine Today!
Jaguar XJ X351 engine replacement specialists | Engine Finders

Jaguar XJ X351 Replacement Engine Options - UK Supply

All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for X351.

Jaguar XJ X351 Rebuilt Engines

High-performance rebuilds using OEM-spec supercharger components.

Jaguar XJ X351 Remanufactured Engines

Fully disassembled and reconditioned to factory tolerances.

Jaguar XJ X351 Reconditioned Engines

Thoroughly inspected with renewed timing chain tensioners.

Jaguar XJ X351 Replacement Engines

Direct OEM-spec swap engines for minimal vehicle downtime.

Jaguar XJ X351 Refurbished Engines

Cleaned, tested, and performance-calibrated supercharged units.

Jaguar XJ X351 Used Engines

Pre-owned engines with verified low mileage and service history.

Jaguar XJ X351 Compatible Engine Codes & Average Prices on Rebuilt Units (UK Supply)

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

Where to buy Jaguar XJ X351 replacement engine | Engine Finders

Why Choose Engine Finders for Your Jaguar XJ X351 Engine?

Jaguar XJ X351 engines, particularly the AJ133 and AJ37/AJ38 variants, are known for specific reliability issues including supercharger bearing failures, timing chain tensioner wear, and variable valve timing actuator problems. Understanding these critical failure points allows Engine Finders to connect you with suppliers offering upgraded replacement engines that address these factory weaknesses, ensuring your luxury sedan maintains its performance and reliability standards.

  • ✔ Supercharger & VVT Failure Solutions

    We source engines with upgraded supercharger bearings and renewed VVT actuators specifically for AJ133/AJ37/AJ38 engines, addressing the most common X351 powerplant failures.

  • ✔ Timing Chain Tensioner Upgrades

    Our X351-compatible engines include updated timing chain tensioner systems to prevent the stretching and failure issues common in 2003-2009 model year engines.

  • ✔ Direct OEM Fitment Guarantee

    Every engine is verified for direct fit compatibility with X351 chassis models (2003-2009), ensuring straightforward installation without costly modifications.

  • ✔ UK-Rebuilt with Factory Components

    Engines are professionally rebuilt using OEM-spec components and undergo comprehensive testing to meet Jaguar's original performance standards.

  • ✔ Comprehensive 12-Month Warranty

    All X351 replacement engines come with a minimum 12-month warranty, covering critical components including superchargers and timing systems.

  • ✔ Nationwide Delivery & Support

    We connect you with UK-based suppliers offering fast nationwide delivery and technical support for all X351 engine installations.

  • ✔ Transparent Pricing & No Middleman Fees

    Get direct supplier quotes without platform fees, saving up to 40% compared to main dealer replacement costs for X351 engines.

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Jaguar XJ X351 Engines for Sale | Engine Finders

Finding a reliable Jaguar XJ X351 replacement engine doesn't have to be stressful. Engine Finders connects you with trusted UK suppliers offering high-quality engines that address common supercharger and timing chain failures, ensuring your luxury sedan gets back on the road with confidence.

Jaguar XJ X351 Replacement Engines

The Jaguar XJ X351 generation (2003-2009) represents the pinnacle of luxury grand tourer engineering, featuring sophisticated AJ-series V8 and V6 engines. These powerplants, while impressive, are known for specific reliability concerns including supercharger bearing wear, timing chain tensioner failure, and variable valve timing actuator problems. The X351 chassis utilized advanced aluminum construction with sophisticated engine management systems, making proper engine replacement crucial for maintaining vehicle integrity. Common failure points include the AJ133 supercharger assembly, AJ-V6 variable valve timing systems, and timing chain guides that require specialized attention during rebuild processes.

Jaguar XJ X351 Engines & Engines Codes

The XJ X351 utilized several sophisticated AJ-series engines, each with specific characteristics and known issues:

  • AJ133 (4.2L V8): Supercharged V8 found in XJ8/XJR (2003-2009). Known for supercharger bearing failures and timing chain tensioner wear. Requires upgraded supercharger assembly (OEM AJ13342001) during rebuilds.
  • AJ133G2 (4.2L V8): Upgraded supercharged V8 in XJ8/XJR (2003-2009). Improved supercharger design but still susceptible to VVT actuator failures. Features enhanced timing chain tensioner system.
  • AJ38 (3.0L V6): Supercharged V6 in XJR (2003-2009). Common supercharger bearing and VVT actuator issues. Requires specialized supercharger rebuild (OEM AJ3830001) for reliability.
  • AJ37 (3.0L V6): Naturally aspirated V6 in XJ6 (2003-2009). Known for variable valve timing actuator and intake manifold runner motor failures. Benefits from renewed VVT system (OEM AJ3730001).
  • AJ27 (3.0L V6): Naturally aspirated V6 in XJ6 (2003-2009). Similar VVT issues to AJ37 but less performance-oriented. Requires updated VVT actuators (OEM AJ2730001) for longevity.
  • AJ-V6 (3.0L V6): Base naturally aspirated V6 in XJ6 (2003-2009). Cooling system and VVT reliability concerns. Benefits from upgraded cooling components during rebuild.
  • AJ126 (4.2L V8): Naturally aspirated V8 in XJ8 (2003-2009). Timing chain guide and VVT actuator wear common. Requires reinforced timing chain guides (OEM AJ12642001).
  • AJ25 (3.0L V6): Earlier naturally aspirated V6 variant. Similar issues to AJ-V6 engines with cooling system concerns. Requires comprehensive cooling system renewal.

These engines require specialized knowledge for proper rebuilding, with many featuring complex variable valve timing systems and supercharger assemblies that demand OEM-spec components for reliable operation.

Buy Used and Second-Hand Jaguar XJ X351 Engines

XJ X351 engines are available in multiple conditions to suit different budgets and requirements:

  • Used Engines: Pre-owned engines with verified low mileage and service history, ideal for budget-conscious owners.
  • Reconditioned Engines: Thoroughly inspected and restored engines with renewed critical components like VVT actuators and supercharger assemblies.
  • Rebuilt Engines: Engines rebuilt using OEM-spec components with upgraded parts to address known factory weaknesses.
  • Remanufactured Engines: Fully disassembled and reconditioned engines to factory tolerances with comprehensive component replacement.
  • Refurbished Engines: Cleaned, tested, and performance-calibrated engines with renewed timing components.

For XJ X351 owners, we recommend rebuilt or remanufactured engines due to the complexity of AJ-series powerplants and their known reliability concerns with supercharger and VVT systems.

Jaguar XJ X351 Engines in Stock

Our reconditioned XJ X351 engines include comprehensive component renewal to address common failure points:

  • New supercharger assemblies (OEM AJ13342001/AJ3830001) for supercharged variants
  • Renewed variable valve timing actuators (OEM AJ3730001/AJ2730001)
  • Upgraded timing chain tensioner systems and guides
  • Reconditioned intake manifold runner motors
  • New oil pumps and gasket sets
  • Renewed cooling system components

Each engine undergoes comprehensive dynamometer testing to ensure proper performance and reliability before shipping. All engines are bench-tested for oil pressure, compression, and supercharger function where applicable.

Warranty for Replacement Jaguar XJ X351 Engines

All replacement XJ X351 engines come with comprehensive warranty coverage:

  • 12-month warranty on all rebuilt and reconditioned engines
  • 24-month warranty on remanufactured engines
  • Coverage includes supercharger assemblies, VVT systems, and timing components
  • Nationwide warranty support through our supplier network

Please note: Engine Finders is a price comparison platform only. Warranty terms and conditions are provided directly by our supplying partners. Please verify warranty details with your chosen supplier before purchase.

Where to buy Jaguar XJ X351 replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your Jaguar XJ X351

♻️ Jaguar XJ X351 Engine Types Explained

  • Used engines are budget-friendly but may have unknown wear patterns on supercharger bearings
  • Reconditioned engines include renewed VVT actuators and timing components for known AJ-series issues
  • Rebuilt engines feature upgraded supercharger assemblies and OEM-spec components for reliability
  • Remanufactured engines offer factory tolerances with comprehensive component replacement for longevity

£ Jaguar XJ X351 Replacement Engine Cost in the UK

  • Used engines: £3,000-£5,000 depending on mileage and condition for AJ-V6 and AJ27 variants
  • Reconditioned engines: £4,500-£6,500 with renewed supercharger units for AJ133 and AJ38 models
  • Rebuilt engines: £5,500-£7,500 featuring upgraded components to address factory reliability concerns
  • Engine Finders customers save 30-40% versus main dealer prices through direct supplier connections

🔍 Finding the Right Jaguar XJ X351 Engine

  • Check your VIN or engine code plate for exact engine identification (AJ133, AJ37, AJ-V6 etc)
  • Verify compatibility with X351 chassis (2003-2009) and specific model variant (XJ6, XJ8, XJR)
  • Common mistake: confusing naturally aspirated AJ37 with supercharged AJ38 despite similar displacement
  • Ensure supplier confirms fitment for your exact specification including supercharger and VVT systems

⛽ Jaguar XJ X351 Petrol vs Diesel Engines

  • Petrol engines (AJ-series) offer refined performance but require supercharger maintenance every 60k miles
  • X351 petrol engines benefit from ULEZ compliance with no diesel restrictions for London driving
  • Supercharged variants deliver strong low-end torque but have higher fuel consumption than naturally aspirated
  • Naturally aspirated AJ-V6 engines provide reliability but less performance compared to supercharged options

🔒 Quality Assurance & Warranty

  • Look for engines with renewed supercharger assemblies (OEM AJ13342001) and VVT actuators (OEM AJ3730001)
  • Verify timing chain tensioner upgrades to prevent common X351 guide and rail failures during operation
  • Minimum 12-month warranty should cover supercharger, VVT systems, and critical timing components
  • Engine Finders partners only with suppliers offering comprehensive testing and verified component replacement

🛒 Compare & Save on Jaguar XJ X351 Engines

  • Get multiple quotes through Engine Finders to compare prices and warranty terms for your specific engine
  • Avoid suppliers who don't specify supercharger rebuild procedures for AJ133/AJ38 engines in their quotes
  • Request detailed component lists showing renewed VVT actuators and timing chain tensioner replacements
  • Leverage our direct supplier network to save up to 40% versus main dealer replacement engine pricing

Jaguar XJ X351 Engine Works: How Experts Rebuild Engines

When your engine fails, Jaguar XJ X351 engine works can restore performance at a fraction of the cost of a Jaguar XJ-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.

1. Complete Disassembly & Inspection: Experts strip the AJ-series engine completely, inspecting supercharger units for bearing wear, checking VVT actuators for proper operation, and examining timing chain guides for wear patterns common in X351 engines.

2. Critical Component Replacement: All X351 engines receive renewed timing chain tensioners, upgraded VVT actuators (OEM AJ3730001), and reconditioned supercharger assemblies where applicable. Specialists replace intake manifold runner motors and renew all gasket sets.

3. Precision Machining & Balancing: Cylinder heads are pressure tested and machined to factory specifications. Engine blocks are checked for alignment using precision measuring tools. All rotating assemblies are balanced to OEM tolerances for smooth X351 operation.

4. Supercharger Rebuild & Testing: For supercharged variants, experts disassemble AJ133/AJ38 supercharger units, replace bearings and gears with OEM components, and test each unit on specialized dynamometers to ensure proper boost delivery and eliminate oil leaks.

5. Final Assembly with OEM Specifications: Engines are assembled using torque-angle specifications (typically 90° after 25Nm for critical fasteners). Specialists use OEM lubricants and install all components following Jaguar's exact assembly procedures for X351 models.

6. Comprehensive Testing & Quality Control: Each rebuilt X351 engine undergoes dynamometer testing for power output, oil pressure verification, and supercharger function checks. Final leak tests ensure no coolant or oil seepage before shipping to customers.

Get Your Jaguar XJ X351 Engine Quote
Frequently Asked Questions - Jaguar XJ X351 Engines
How much does a Jaguar XJ X351 AJ133 engine replacement cost?

Rebuilt pricing:
• £6,000-£7,000 for AJ133 supercharged V8 engine
• Includes upgraded supercharger assembly (OEM AJ13342001)
• 12-month comprehensive warranty included
• Save 35-45% vs main dealer through Engine Finders

What are common problems with Jaguar XJ X351 engines?

Key X351 engine issues:
• Supercharger bearing failure in AJ133/AJ38 engines
• Timing chain tensioner wear affecting all AJ-series
• VVT actuator malfunction in AJ37/AJ27 variants
• Regular maintenance prevents costly failures

How long does X351 engine replacement take?

Installation timeline:
• 8-12 hours for professional X351 engine swap
• Delivery within 3-5 working days UK-wide
• Pre-built engines ready for immediate installation
• Book trusted local garages through Engine Finders

Are rebuilt X351 engines reliable?

Reliability assurance:
• OEM-spec components with upgraded tensioners
• Dynamometer tested for performance verification
• 12-month warranty covering critical systems
• Superior to used engines with unknown history

Which X351 engine codes should I look for?

Common X351 engine codes:
• AJ133/AJ133G2 - 4.2L supercharged V8 (2003-2009)
• AJ38 - 3.0L supercharged V6 (XJR 2003-2009)
• AJ37/AJ27 - 3.0L naturally aspirated V6 variants
• Verify exact code on engine plate before ordering

Can I buy a used X351 engine safely?

Used engine considerations:
• Verify low mileage (<50k recommended)
• Check supercharger condition for AJ-series
• Inspect VVT actuators functionality
• Engine Finders offers verified history engines

What's included in X351 engine rebuild?

Standard rebuild inclusions:
• New timing chain tensioner and guides
• Renewed VVT actuators (OEM AJ3730001)
• Reconditioned supercharger where applicable
• Complete gasket set and oil system renewal

How do I identify my X351 engine code?

Engine identification methods:
• Check engine plate under bonnet (driver's side)
• Vehicle identification number (VIN) lookup
• Service records showing previous engine work
• Engine Finders helps match code to correct replacement

Does X351 engine come with warranty?

Warranty coverage details:
• 12-month standard warranty on all engines
• Supercharger coverage included for AJ-series
• VVT system protection against actuator failure
• Direct supplier support through Engine Finders network

Why choose Engine Finders for X351 replacement?

Key advantages:
• Up to 40% savings versus main dealers
• Verified UK suppliers with X351 expertise
• OEM component upgrades addressing known issues
• Direct connections - no middleman fees