

Jaguar XK 4.2 V8Engine Rebuild- From £4,500
Specialist Jaguar XK 4.2 V8 engine rebuilds and replacements, with registration-based engine matching, nationwide recovery and a 12-month unlimited-mileage warranty
Rated Jaguar Engine Specialists - 1,800+ Engines Rebuilt
Specialist technicians with 10-15 years of experience
12 Month Unlimited-Mileage Warranty
Nationwide Recovery
Free Engine Matching by Registration
AJ-V8 Gen III Specialists

Your Jaguar XK 4.2 V8 Engine

Vehicle
Jaguar XK 4.2 V8
Model
XK
Variant
XK 4.2 V8
Fuel
Petrol
Engine
AJ-V8 Gen III
Capacity
4.2L V8
Generations
X150 (2005-2014)
Rebuild From
£4,500
Not sure which engine you have?
Enter your registration below and we'll confirm your exact spec before you get a quote.
DVLA & VIN verified
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No obligation quote

Jaguar XK 4.2 V8Engine Rebuild Price
Starting From £4,500
Engine Code

Rebuild From
£4,500
Generation

2005-2014
Jaguar XK 4.2 V8
Variant

4.2L Petrol
AJ-V8 Gen III
AJ-V8 Gen III sits on a single rebuild tier.
Exact price depends on condition and parts required - submit your reg for a fixed-price quote.
Jaguar XK 4.2 V8 Timing Chain Tensioner Wear (X150, AJ-V8 Gen III)
If your XK 4.2 V8 is an X150-generation model with the AJ-V8 Gen III engine - covering the 2005 to 2014 production run - timing chain tensioner and guide wear is the single most frequently reported issue on this engine, backed by independent analysis of 2,500+ owner reports. We replace the timing chain, tensioners, guides and water pump as standard on every AJ-V8 Gen III rebuild.
Source: verified via multiple independent sources (au7o.io, rrsport.co.uk lawsuit list), per VRF-jaguar-xk.md. Applies to X150 4.2L V8 and 5.0L V8 variants.
Jaguar XK 4.2 V8ENGINE OPTIONS
Every XK 4.2 V8 is different. That's why we offer the right solution for your engine, your car and your budget.
REBUILDING YOUR XK 4.2 V8 ENGINE
Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your XK 4.2 V8 already has instead - strip it down, pressure-test it, and replace every worn or damaged component (timing chain, tensioners, guides and water pump) with updated OEM parts. You get a near-new engine with a 12-month unlimited-mileage warranty, without the compatibility risk of an unknown used unit. This is the option most XK owners choose, and it's the one we'd recommend for most situations.
From £4,500RECONDITIONED XK 4.2 V8 ENGINES
"Reconditioned" is the term many owners search for when they mean the same thing as a rebuild - a full strip-down, inspection, and replacement of worn parts rather than a straight swap. If that's what you're after, our rebuild service is exactly that.
Learn moreREFURBISHED XK 4.2 V8 ENGINES
Similarly, "refurbished" often describes the same process from a different angle - restoring your existing engine to full working condition rather than replacing it outright. Our rebuild covers this.
Learn moreREMANUFACTURED XK 4.2 V8 ENGINES
Some owners specifically search for a "remanufactured" engine, expecting a unit rebuilt to original specification with updated components. That's consistent with what our rebuild service delivers on the AJ-V8 Gen III.
Learn moreREPLACEMENT XK 4.2 V8 ENGINES
If your existing engine is beyond economical repair, we also offer full engine replacement and fitting - sourced and fitted by our team, with the same 12-month warranty.
Learn moreUSED XK 4.2 V8 ENGINES
In some cases, a matched low-mileage used engine is the right call - particularly if you need your car back on the road quickly and your existing engine's damage is extensive. We can source and fit these too, though most owners who ask about used engines end up choosing a rebuild once they understand the compatibility risk a used unit carries. Enter your reg below and we'll talk you through both options honestly.
Learn moreNOT SURE WHICH OPTION IS RIGHT FOR YOU?
Enter your registration below and we'll confirm your AJ-V8 Gen III and talk you through the best solution for your XK 4.2 V8, honestly.
Ask About Your OptionsOUR WORKSHOP

01RECOVERY COLLECTION
Jaguar XK 4.2 V8 recovered nationwide.

02STRIPPED ENGINE BLOCK
Jaguar XK 4.2 V8 AJ-V8 Gen III engine stripped for inspection.

03TIMING CHAIN REPLACEMENT
Jaguar XK 4.2 V8 timing chain and guides replaced.
04TECHNICIANS AT WORK
Jaguar XK 4.2 V8 engine rebuild in progress.
05ENGINE TESTING (RIG)
Jaguar XK 4.2 V8 AJ-V8 Gen III tested before dispatch.
06COMPLETED & READY FOR REFIT
Jaguar XK 4.2 V8 engine rebuilt to OEM specification.
Real photos from our workshop - not stock imagery. This is what a genuine Jaguar XK 4.2 V8 rebuild looks like.
Jaguar XK 4.2 V8 ENGINE REBUILD PROCESS
WE COVER YOUREXACT VEHICLE
Enter your registration below and we'll confirm your Jaguar XK 4.2 V8 has the AJ-V8 Gen III, along with an exact rebuild price.
WHY JAGUAR XK 4.2 V8 OWNERS CHOOSE US
Engine matched using VIN or registration number
Genuine specialist workshop - not a broker
Specialist technicians with 10-15 years of experience
We don't swap your engine for an unknown used unit
Nationwide recovery, workshop rebuild
12 month unlimited-mileage warranty
All engine ancillaries serviced as part of the rebuild
Trade & public enquiries welcome
Dedicated advisor from quote to fit
OUR MOST RECENTJAGUAR RECOVERIES & REBUILDS
Real vehicles brought into our workshop. Open bonnets, stripped blocks, and cars ready for collection - this is what genuine engine work looks like.

Jaguar XK 4.2 V8
RECOVERY

Jaguar XK 4.2 V8
DIAGNOSTICS

Jaguar XK 4.2 V8
STRIPPED ENGINE

Jaguar XK 4.2 V8
TIMING CHAIN REPLACEMENT

Jaguar XK 4.2 V8
IN FOR REBUILD

Jaguar XK 4.2 V8
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most XK models are recovered within a few hours of booking. Most rebuilds are completed within 3-5 working days.
Workshop slots fill up fast - book your recovery today.
LOOKING FOR A USED ORREPLACEMENT ENGINEINSTEAD?
We supply low-mileage, VIN-matched used units too, and offer full replacement and fitting. However, most XK owners choose a rebuild once they realise it removes compatibility risk and works out more cost-effective over the life of the car. Enter your reg below and we'll show you every option, honestly.

ABOUT THE Jaguar XK 4.2 V8 ENGINE

The XK 4.2 V8 uses the AJ-V8 Gen III - a 4.2-litre naturally aspirated V8 petrol engine. It was fitted from 2005 to 2014 across the X150 generation of the XK, replacing the earlier X100-era AJ26/AJ27 engines. The AJ-V8 Gen III represents a significant evolution of Jaguar's V8 family, with improved timing chain components and revised cylinder heads compared to earlier iterations.
The XK 4.2 V8 is no longer in production, but we continue to rebuild and replace engines for every one still on the road.
Jaguar XK 4.2 V8 ENGINE CODES

A 4.2L V8 Petrol engine fitted to the XK 4.2 V8 - X150 (2005-2014).
Check Your AJ-V8 Gen III XK 4.2 V8Jaguar XK 4.2 V8 ENGINE COMPATIBILITY

The XK 4.2 V8 uses the AJ-V8 Gen III engine across its entire X150 production run. Unlike some models that switched engines mid-generation, the 4.2-litre V8 remained consistent throughout. Before we quote or supply anything, we confirm:
Your exact engine code (AJ-V8 Gen III) via registration or VIN
Your generation (X150)
Drivetrain and ancillary specification
Any electronics or ECU considerations specific to your exact build
This is why we always start with your registration rather than a generic XK quote - it protects you from paying for parts that don't fit your actual car.
Jaguar XK 4.2 V8 APPLICATIONS BY GENERATION
Jaguar XK 4.2 V8 ENGINES BY YEAR
Jaguar XK 4.2 V8 has used the AJ-V8 Gen III throughout. If you're unsure of your exact spec, we'll confirm it before you book.
We Cover Every Jaguar XK 4.2 V8 Model Year:
- Jaguar XK 4.2 V8 2005 Engine Rebuild
- Jaguar XK 4.2 V8 2008 Engine Rebuild
- Jaguar XK 4.2 V8 2012 Engine Rebuild
- Jaguar XK 4.2 V8 2014 Engine Rebuild
If your registration year or model isn't listed above, get in touch - we'll confirm availability directly against your reg.
Jaguar XK 4.2 V8 Engine Details:
Jaguar XK 4.2 Litre Engine (AJ-V8 Gen III, V8)
Jaguar XK 4.2 V8 Petrol Engine Rebuilds
If your exact specification isn’t listed here, get in touch - we’ll confirm availability directly against your reg.
Jaguar XK 4.2 V8 Engine COSTS
A Jaguar XK 4.2 V8 engine rebuild starts from
£4,500

A full replacement engine and fitting service is also available. Exact pricing depends on the condition of your existing engine and the parts required - submit your registration for a fixed-price quote within 30 minutes.
JAGUAR XK 4.2 V8 ENGINE SIZES
• Jaguar XK 4.2 Litre Engine (AJ-V8 Gen III, V8)
JAGUAR XK 4.2 V8 FUEL TYPES
• Jaguar XK 4.2 V8 Petrol Engine Rebuilds

RELATED JAGUAR XK VARIANTS
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