Land Rover Engines In Stock NOW: Live Prices, Rebuild Cost & Supply & Fit Service (UK-Wide)
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Jaguar XK Engine Specialists - From AJ-V8 to Supercharged AJ27
At JLR Engine Specialists Ltd, we've focused exclusively on Jaguar Land Rover engines since 2009 - and the Jaguar XK is one of the most iconic grand tourers we service in our Billericay, Essex workshop. Whether you own a 2006 XK 4.2L with the naturally aspirated V8 (AJ27), a 2009 XK Supercharged 4.2L (AJ27SC), or a 2010-2014 XK 5.0L V8 (AJ133), our team has rebuilt, replaced, or restored hundreds of XK engines across both generations (X150, 2006-2014).
We specialise in all Jaguar XK engine families, covering every major trim (XK, XKR, Portfolio, Premium Luxury):
All Engine Replacements Include:
- ✓ Full fitment
- ✓ ECU reset
- ✓ Road test
- ✓ 12-month unlimited-mileage warranty
- ✓ No hidden diagnostics fees if you proceed
Unlike general garages, we work only on JLR powertrains - so your XK engine is handled by technicians who understand its specific high-performance failure patterns, from V8 timing chain tensioner wear and supercharger clutch degradation to oil pump pickup screen clogging and rear main seal leaks - issues commonly reported in high-mileage or infrequently serviced examples.
Based in Billericay (near Chelmsford and Romford), we offer UK-wide vehicle collection for a small fee, ensuring your XK is repaired in our dedicated JLR-only workshop - not a generic bay with non-specialist tools.
"All engine replacements include: Full fitment, ECU reset, road test, and a 12-month unlimited-mileage warranty - with no hidden diagnostics fees if you proceed."
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Precision. Performance. Perfection.
Jaguar XK Engine Fit Guaranteed: All X150 Models (2006-2014)
Starting from £4,400, our reconditioned engines are engineered for perfect fitment across every Jaguar XK model - including all variants of the X150 Coupé and Convertible (2006-2014). No more guessing: we verify compatibility down to the VIN for Portfolio, Premium, R, and special editions like the Dynamic or Ultimate.
Every engine is cross-referenced against Jaguar Land Rover’s technical bulletins - including known issues like the 4.2L V8 timing chain tensioner wear (2006-2009) and supercharger coupler failures in early XK Rs. With 15+ years of JLR V8 expertise and 1,200+ engines rebuilt in our Billericay workshop near Chelmsford, Essex, fitment is guaranteed.
XK Engine Prices: Transparent, OEM-Spec Reconditioned Units from £4,400
Save 40% vs. Dealership Prices - Compare pricing for 4.2L V8, 5.0L V8, and 5.0L Supercharged V8 (XKR) engines across all XK X150 models (2006-2014).
| Engine Code | Est. Price (£) | XK Models (Trim/Body Style) | Engine Size (L) | Fuel Type | Power (kW/HP) | Year Range | Warranty | Request Quote |
|---|
Note: All replacements include correct ancillaries (supercharger where applicable, manifolds, sumps, sensors, and wiring looms) matched to your VIN. We support both pre-facelift (2006-2009) and post-facelift (2010-2014) XK models, including updated engine mounts and ECU protocols.
Key Reliability Insights
4.2L V8 (AJ-V8): Prone to timing chain tensioner failure after 80k miles - plastic tensioners degrade under heat.
5.0L Supercharged (AJ133/G2): Oil consumption and main bearing wear common in XKR/XKR-S due to high boost; intercooler pump failure leads to heat soak.
5.0L Naturally Aspirated (508PN): Most reliable XK engine - no supercharger complexity, lower thermal stress.
3.0L V6: Extremely rare (Europe only) - not sold in UK.
"Certified XK Engine Rebuilds by JLR-Trained Technicians - Based in Essex, Serving the South East & UK via Collection"
How We Rebuild Your Jaguar XK Engine - Precision, Not Promises
This isn't a catalogue rebuild. Every Jaguar XK engine we restore is treated as a unique case - based on its engine code, mileage, usage history, and failure pattern. Here's our 5-step workshop process, performed entirely in-house at our Billericay, Essex facility by JLR-trained technicians:
Root-Cause Diagnosis - Beyond the Fault Code
We identify the true failure trigger - not just the symptom:
→ AJ27 (4.2L NA)? Inspect timing chain guides for wear and rear main seal for leaks - common in high-mileage examples.
→ AJ27SC / AJ133SC (Supercharged)? Assess supercharger clutch engagement, oil pump pickup screen for sludge, and intercooler hose integrity.
→ All V8s? Check for oil starvation signs due to infrequent oil changes or short-trip driving.
You receive photo evidence and diagnostic logs - not assumptions.
Precision Metrology - Engineered to OEM Tolerances
Using calibrated bore gauges, dial indicators, and surface plates, we verify:
→ Crankshaft runout and journal wear (<0.03mm tolerance)
→ Cylinder bore taper and roundness (critical for ring seal in high-compression V8s)
→ Cylinder head flatness (<0.05mm over 300mm - essential for MLS gasket reliability)
If out of spec, we machine in-house - no outsourcing.
Rebuild with Known Weakness Fixes
We integrate proven upgrades to prevent repeat failures:
→ AJ27/AJ133: Reinforced timing chain tensioners, updated oil pump pickup tubes, Viton rear main seals
→ Supercharged models: Upgraded supercharger clutch kits, silicone intercooler hoses, and revised PCV systems
All components are OEM or premium-tier: Mahle pistons, Elring gaskets, Bosch sensors - never budget alternatives.
In-House Machining & Clean Assembly
Block honing, head resurfacing, and pressure testing are all completed on-site. Engines are assembled in a dedicated clean bay with controlled airflow to prevent particulate contamination - critical for aluminium-block V8 performance engines.
Validation - Controlled Run-In + Real-World Testing
Before your XK leaves our workshop:
→ 45-minute controlled run-in on engine stand (oil pressure ≥3.5 bar at hot idle)
→ Full ECU reset, adaptation, and security handshake using JLR SDD and Autologic
→ 15-mile loaded road test including cold restart, highway load, throttle response, and emissions verification
You receive a signed validation report - not just a warranty slip.
"Since 2009, we've rebuilt 1,200+ JLR engines - including hundreds of XKs across 4.2L and 5.0L NA/SC variants. We don't sell engines. We sell peace of mind for XK owners across Essex and the UK."
Jaguar XK Engine Warning Signs - And How We Fix Them for Good
Spot one of these issues? You're not alone. These are the most frequent XK engine failures we diagnose weekly in our Billericay, Essex workshop - and exactly how we resolve them permanently, not just temporarily.
| Problem | Likely Cause | Our Fix | Affects |
|---|---|---|---|
| Rattling or knocking on cold start | Timing chain tensioner or guide wear (exacerbated by infrequent oil changes) | Full timing system replacement with updated tensioners and guides; oil pump inspected | XK 4.2L / 5.0L V8 (2006-2014) |
| Oil dripping onto exhaust or gearbox | Rear main seal or sump gasket leak (common in high-mileage or track-used cars) | All critical seals replaced as standard using OEM-spec Viton materials | All XK V8 models |
| Whining noise from front of engine + oil pressure warning | Sludge-blocked oil pickup screen (often due to short trips or missed services) | Sump removed, pickup screen cleaned, full oil system flush, and PCV system upgraded | AJ27 & AJ133 engines, especially pre-2010 |
| Loss of supercharger whine or boost (XKR/XKR-S) | Worn supercharger clutch or oil seal failure | Supercharger clutch and seals replaced; oil feed lines flushed and inspected | XKR 4.2L SC (2006-2009), XKR/XKR-S 5.0L SC (2010-2014) |
| Excessive oil consumption (>1L/1,000 miles) | Worn piston rings or valve stem seals (frequently seen in neglected or high-RPM use) | Full engine rebuild with Mahle pistons and Elring seals; compression and leak-down tests performed | All XK V8 variants |
| Engine misfires or cuts out under load | Failing coil packs, carbon buildup, or fuel pressure issues | Ignition system tested and renewed; fuel system inspected and calibrated via JLR SDD | Primarily 2006-2009 AJ27 models |
Don't guess - diagnose. Book a free engine assessment and get a no-obligation, VIN-specific repair plan from Jaguar XK engine specialists based in Essex (near Chelmsford and Romford). We offer UK-wide vehicle collection so your grand tourer can be repaired correctly - first time, every time.