Jaguar Engine Specialists
JAGUAR AJ34S ENGINEREBUILD & REPLACEMENT
Specialist Jaguar AJ34S engine rebuilds and replacements, fitted across the XF XFR. Nationwide recovery, registration-based engine matching, 12-month unlimited-mileage warranty.
Rated Jaguar Engine Specialists - 500+ Engines Rebuilt
Specialist technicians with 10-15 years of experience
12 Month Unlimited-Mileage Warranty
Nationwide Recovery
Free Engine Matching by Registration
Fitted Across the XF XFR
Starting from
£5,500
Jaguar AJ34S Engine Specifications
Engine Code
AJ34S
Manufacturer
Jaguar
Configuration
V8
Capacity
4.2L (4,196 cc)
Fuel
Petrol Supercharged
Production Years
2008-2015
Used In
1 Jaguar model
Jaguar AJ34S Engine Rebuild Price
Starting From
£5,500
The AJ34S sits on our supercharged V8 rebuild tier. Exact price depends on condition and parts required - submit your reg for a fixed-price quote.
Get Your Fixed-Price Quote →
Jaguar AJ34S Applications - Every Model & Variant
Not seeing your exact model?
Send us your registration and we'll confirm.
Jaguar AJ34S Rebuild Components
Replaced as Standard
- Main bearings and connecting rod bearings
- Complete gasket and seal set
- Timing chain components where required
- Supercharger coupler
- Oil filter housing gasket
Inspected and Measured
- Crankshaft
- Cylinder head
- Timing chain tensioners and guides - critical known issue
- Supercharger
Inspected and Measured
- Cooling system components
- Fuel injectors
- PCV system
Application-Dependent
- Vehicle-specific ancillaries
Components drawn directly from Master Engine Data File research. If your AJ34S's exact ancillary set isn't covered above, we confirm the full scope once your engine is inspected - not guessed in advance.
OUR WORKSHOP
01RECOVERY COLLECTION
02STRIPPED AJ34S BLOCK
03INTERNAL ENGINE WORK
04TECHNICIANS AT WORK
05ENGINE TESTING (RIG)
06COMPLETED & READY FOR REFIT
Real photos from our workshop - not stock imagery.
JAGUAR AJ34S ENGINE REBUILD PROCESS
WE COVER YOUREXACT VEHICLE
WHY CHOOSE US FOR JAGUAR AJ34S REBUILDS
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 XF
RECOVERY
Jaguar XF
DIAGNOSTICS
Jaguar XF
STRIPPED ENGINE
Jaguar XF
TIMING CHAIN REPLACEMENT
Jaguar XF
IN FOR REBUILD
Jaguar XF
REBUILD IN PROGRESS
HOW IT WORKS
SEND YOURREGISTRATION
RECEIVE YOURFIXED-PRICE QUOTE
WE RECOVERYOUR CAR
REBUILD &REFIT
Most cars 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.
ABOUT THE
JAGUAR AJ34S ENGINE
The AJ34S is Jaguar's 4.2-litre supercharged V8 petrol engine, produced from 2008 to 2015. It's the high-output version of the AJ34 naturally aspirated V8, fitted exclusively to the XFR variant of the X250-generation XF. The supercharger sits on top of the engine and must be removed to access the valley where the oil cooler, timing chain, and other critical components reside.
JAGUAR AJ34S
APPLICATIONS BY MODEL
The AJ34S is fitted to the XF XFR (X250, 2008-2015), producing 420 hp. This is a single-application engine - the supercharged 4.2-litre V8 was reserved exclusively for the XFR variant during this generation.
JAGUAR AJ34S
ENGINE COMPATIBILITY
The AJ34S is a supercharged version of the naturally aspirated AJ34 4.2 V8, with specific tuning, supercharger hardware, and ECU calibration that differs from the standard engine. Ancillaries, mounting, ECU calibration, and supercharger tune are specific to the XFR application. Registration/VIN matching is required before any rebuild or replacement.
MODEL
Confirm your exact model and variant.
GENERATION
Identify the correct generation (X250).
DRIVETRAIN
Drivetrain and ancillary specification.
CONFIRMED BY REGISTRATION
We confirm by registration/VIN before quoting or supplying anything.
Jaguar AJ34S
Applications We Work On
AJ34S in the XF XFR (X250, 2008-2015)
The AJ34S in the XF XFR is one of the applications we work on regularly - the supercharged 4.2-litre V8 was reserved exclusively for this high-performance saloon variant. Data-Rich Details: Model: XF Variant: XFR Generation: X250 Chassis: X250 Years: 2008-2015 Powertrain: Supercharged V8
Starting from:
£5,500
MODEL
Jaguar XF X250
ENGINE
AJ34S 4.2L
YEAR
2008 - 2015
STARTING FROM
£5,500
OUR WORKSHOP VIEW OF
THE JAGUAR AJ34S
Built, rebuilt and tested by engineers who work on Jaguar engines every day.
Here's our practical view of the AJ34S across its XF X250 application.
APPLICATIONS WE SEE:
The AJ34S is a single-application engine - fitted to the XF XFR (X250, 2008-2015) - and we work on it regularly.
WHAT WE REPLACE:
Main bearings, connecting rod bearings, complete gasket and seal set, timing chain components where required, supercharger coupler, and oil filter housing gasket as standard on every rebuild.
KNOWN ISSUES:
The AJ34S shares timing chain tensioner issues with other AJ-V8 engines. Supercharger coupler wear can cause rattling noise. Cooling system leaks from pipes, hoses, and connectors are also confirmed.
AJ34S REBUILD INFORMATION
Typical rebuild scope:
A TYPICAL
JAGUAR AJ34S REBUILD
The following describes a typical rebuild scope for this engine - illustrative of the work involved, not a specific customer job. Real case studies from our own completed work will replace this section once available.
The AJ34S's timing chain system is a known critical wear point - we inspect it thoroughly on every rebuild. The supercharger sits on top of the engine and must be removed to access the valley where the oil cooler, timing chain, and other critical components reside.
01INSPECTION & STRIP-DOWN
Careful inspection of the crankshaft, cylinder head, and timing chain components during strip-down.
02COMPONENT REPLACEMENT
Main bearings, connecting rod bearings, gaskets, seals, and timing chain components replaced as required.
03QUALITY CHECKS
All major rotating assemblies, oil pump, and cooling system components inspected for long-term reliability.
Typical Scope:
Main bearings, connecting rod bearings, complete gasket and seal set, timing chain components where required, supercharger coupler, oil filter housing gasket
Starting From:
£5,500
Jaguar AJ34S
ENGINE REBUILD COST
A Jaguar AJ34S engine rebuild starts from £5,500.
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.
Starting From
£5,500
Get a fixed-price quote within 30 minutes.
MODEL
Jaguar XF X250
ENGINE
AJ34S 4.2L
YEAR
2008 - 2015
STARTING FROM
£5,500
JAGUAR AJ34S REBUILD VS REPLACEMENT VS USED
Rebuilding Your AJ34S Engine
Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your Jaguar already has instead - strip it down, pressure-test it, and replace every worn or damaged component 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 XFR owners choose, and it's the one we'd recommend for most situations.
- Strip down & inspect
- Pressure-test
- Replace worn components
- 12-month unlimited-mileage warranty
Replacement AJ34S 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 unlimited-mileage warranty.
- Supplied & fitted by our team
- OEM quality
- 12-month unlimited-mileage warranty
Used AJ34S 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.
- Low-mileage units
- Quick turnaround
- Condition risk - we advise honestly
Enter your registration and we’ll talk you through both options honestly.
Reconditioned, Refurbished or Remanufactured?
JAGUAR AJ34S RECONDITIONED 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.
→ Our rebuild service is exactly that.
JAGUAR AJ34S REFURBISHED ENGINES
"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.
→ Our rebuild service covers this.
JAGUAR AJ34S REMANUFACTURED 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. Jaguar AJ34S Terminology Explained Rebuilt: Existing engine stripped, inspected and rebuilt to original specification. Reconditioned: Broad industry term; we define our rebuild as a full strip and rebuild. Remanufactured: Usually implies a defined restoration process; our rebuild meets this standard. Used: Existing engine from another vehicle; we can source and fit these. What Jaguar Garage Means by "Rebuild": Full strip-down, inspection, measurement, machining where required, replacement of worn components, reassembly, testing, and refit - with a 12-month unlimited-mileage warranty.
→ That’s consistent with what our rebuild service delivers.
FREQUENTLY ASKED QUESTIONS
GET YOUR FREE
JAGUAR AJ34SFIXED-PRICE QUOTE
FIXED PRICE
Transparent quotes with no hidden extras.
12-MONTH WARRANTY
Unlimited mileage for total peace of mind.
QUICK RESPONSE
Most quotes returned within 30 minutes during working hours.
