Jaguar Garage - JAGUAR ENGINE REBUILD SPECIALISTS
Jaguar technician rebuilding an engine block
Jaguar

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

GB
Jaguar

Your Jaguar XK 4.2 V8 Engine

Jaguar Ingenium 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.

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DVLA & VIN verified

100% secure & private

No obligation quote

Jaguar

Jaguar XK 4.2 V8Engine Rebuild Price

Starting From £4,500

AJ-V8 Gen III

Engine Code

AJ-V8 Gen III engine

Rebuild From

£4,500

X150

Generation

X150 engine

2005-2014

Jaguar XK 4.2 V8

XK 4.2 V8

Variant

XK 4.2 V8 engine

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.

Get Your 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.

01MOST POPULAR

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 £4,500
02

RECONDITIONED 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 more
03

REFURBISHED 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 more
04

REMANUFACTURED 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 more
05

REPLACEMENT 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 more
06

USED 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 more

NOT 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 Options

OUR WORKSHOP

Jaguar
RECOVERY COLLECTION01

RECOVERY COLLECTION

Jaguar XK 4.2 V8 recovered nationwide.

STRIPPED ENGINE BLOCK02

STRIPPED ENGINE BLOCK

Jaguar XK 4.2 V8 AJ-V8 Gen III engine stripped for inspection.

TIMING CHAIN REPLACEMENT03

TIMING CHAIN REPLACEMENT

Jaguar XK 4.2 V8 timing chain and guides replaced.

TECHNICIANS AT WORK04

TECHNICIANS AT WORK

Jaguar XK 4.2 V8 engine rebuild in progress.

ENGINE TESTING (RIG)05

ENGINE TESTING (RIG)

Jaguar XK 4.2 V8 AJ-V8 Gen III tested before dispatch.

COMPLETED & READY FOR REFIT06

COMPLETED & 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

1Diagnosis

We confirm your exact engine code and assess the damage.

2Removal

Your engine is removed and brought into our workshop.

3Strip-Down

Every component is removed for individual inspection.

4Inspection

Crankshaft, cylinder head, timing chain, tensioners and guides are all checked.

5Machine Work

Any machining required is carried out to OEM tolerances.

6Component Replacement

Worn or damaged parts are replaced with updated OEM components.

7Reassembly

Your engine is rebuilt to original specification.

8Testing

Every rebuild is pressure-tested before refit.

9Refit

Your engine goes back into your XK 4.2 V8.

10Road Test

A full road test confirms everything's right before we hand your car back.

WHAT JAGUAR XK 4.2 V8 OWNERS SAY

Daniel R.

“Brilliant service from start to finish. My XK 4.2 V8 runs smoother than ever. Honest advice, clear pricing and the team know their stuff.”

See on Google

Mark T.

“They rebuilt my AJ-V8 Gen III with all the updated parts. Smooth process and great communication throughout.”

See on Trustpilot

Ryan P.

“Top lads, top job. Picked up and dropped off, engine rebuilt to an extremely high standard. 100% recommend.”

See on Google

Steve B.

“Saved me thousands compared to a dealer quote. Fantastic workmanship and my XK 4.2 V8 is running perfectly.”

See on Trustpilot

Tom H.

“From quote to collection couldn't fault them. Engine looks brand new inside. Warranty gives great peace of mind.”

See on Google

James K.

“Professional, reliable and fairly priced. Sorted properly and kept me updated throughout.”

See on Trustpilot

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.

GB
FastAccurateNo Guesswork

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

Jaguar XK 4.2 V8

RECOVERY

Jaguar XK 4.2 V8

Jaguar XK 4.2 V8

DIAGNOSTICS

Jaguar XK 4.2 V8

Jaguar XK 4.2 V8

STRIPPED ENGINE

Jaguar XK 4.2 V8

Jaguar XK 4.2 V8

TIMING CHAIN REPLACEMENT

Jaguar XK 4.2 V8

Jaguar XK 4.2 V8

IN FOR REBUILD

Jaguar XK 4.2 V8

Jaguar XK 4.2 V8

REBUILD IN PROGRESS

HOW IT WORKS

1

SEND YOURREGISTRATION

2

RECEIVE YOURFIXED-PRICE QUOTE

3

WE RECOVERYOUR CAR

4

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.

Jaguar engines on workshop pallets

ABOUT THE Jaguar XK 4.2 V8 ENGINE

Jaguar E-Pace and Ingenium 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

AJ-V8 Gen III

AJ-V8 Gen III

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 V8

Jaguar XK 4.2 V8 ENGINE COMPATIBILITY

Black Jaguar E-Pace in a workshop

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

Generation

Chassis

Years

Engine Code

Fuel

X150

X150

X150

2005-2014

AJ-V8 Gen III

Petrol

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.

Year

Generation

Engine Code

Fuel

Service

2005

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2006

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2007

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2008

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2009

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2010

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2011

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2012

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2013

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

2014

X150

AJ-V8 Gen III

Petrol

Rebuild / Replacement

i

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

Jaguar engine

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

FREQUENTLY ASKED QUESTIONS

Black Jaguar E-Pace in a dark showroom

GET YOUR FREE Jaguar XK 4.2 V8 FIXED-PRICE QUOTE

Most quotes returned within 30 minutes during working hours.