Jaguar Engine Specialists
JAGUAR AJ27 ENGINEREBUILD & REPLACEMENT
Specialist Jaguar AJ27 engine rebuilds and replacements, fitted across XJ8 and XK8 models. Nationwide recovery, registration-based engine matching, 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
Fitted Across 2 Jaguar Models
Starting from
£4,500
Jaguar AJ27 Engine Specifications
Engine Code
AJ26 / AJ27
Manufacturer
Jaguar
Configuration
V8
Capacity
4.0L (3,996 cc)
Fuel
Petrol
Production Years
1996-2004
Used In
2 Jaguar models
Jaguar AJ27 Engine Rebuild Price
Starting From
£4,500
The AJ26 and AJ27 engines sit on the same 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 AJ27 Applications - Every Model & Variant
Not seeing your exact model?
Send us your registration and we'll confirm.
Jaguar AJ27 Rebuild Components
Replaced as Standard
- Main bearings and connecting rod bearings
- Complete gasket and seal set
- Timing chain components where required - critical known issue
- Oil filter housing gasket
Inspected and Measured
- Crankshaft
- Cylinder head
- Timing chain tensioners - critical known issue
- Timing chain guides - critical known issue
Inspected and Measured
- Oil pump
- Cooling system components
- Fuel injectors
Application-Dependent
- Supercharger components (AJ27S)
Components drawn directly from Master Engine Data File. If your AJ27'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 AJ27 BLOCK
03INTERNAL ENGINE WORK
04TECHNICIANS AT WORK
05ENGINE TESTING (RIG)
06COMPLETED & READY FOR REFIT
Real photos from our workshop - not stock imagery.
JAGUAR AJ27 ENGINE REBUILD PROCESS
WE COVER YOUREXACT VEHICLE
WHY CHOOSE US FOR JAGUAR AJ27 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
Known timing chain tensioner issues are inspected thoroughly on every rebuild
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 XJ
RECOVERY
Jaguar XK
DIAGNOSTICS
Jaguar XJ
STRIPPED ENGINE
Jaguar XK
TIMING CHAIN REPLACEMENT
Jaguar XJ
IN FOR REBUILD
Jaguar XK
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 AJ27 ENGINE
The AJ27 is Jaguar's 4.0-litre naturally aspirated V8 petrol engine, part of the AJ-V8 family that powered Jaguar's flagship models through the late 1990s and early 2000s. It's fitted across two model lines - the XJ XJ8 (X308, 1997-2003) and the XK XK8 (X100, 1996-2004) - making it one of the defining engines of Jaguar's modern era before the switch to the 4.2-litre AJ34 and later 5.0-litre AJ133. The AJ27 was developed alongside the earlier AJ26 as a 4.0-litre V8 with notable improvements, particularly addressing the cylinder lining issues that affected some early Nikasil-equipped engines. The AJ27 (and the supercharged AJ27S variant fitted to the XKR) remains one of the most widely-recognised engines in Jaguar's modern V8 lineage.
JAGUAR AJ27
APPLICATIONS BY MODEL
The AJ27 is found in two primary applications. The XJ XJ8 (X308, 1997-2003) uses the engine in its naturally aspirated form, delivering the smooth V8 power that defined the X308 generation's character. The XK XK8 (X100, 1996-2004) uses the same naturally aspirated engine - and, in the supercharged XKR variant, the AJ27S with a supercharger added. Beyond these two core applications, the earlier AJ26 variant is also used in some early X308 and X100 models, though for rebuild purposes the AJ26 and AJ27 share the same engine family, components, and known issues.
JAGUAR AJ27
ENGINE COMPATIBILITY
Because the AJ27 spans two different models - the XJ and XK - compatibility comes down to confirming your exact model and whether your specific vehicle carries the naturally aspirated or supercharged variant. A naturally aspirated AJ27 from an XJ isn't a drop-in match for a supercharged AJ27S from an XKR - ancillaries, ECU calibration, and mounting all differ. Before we quote or supply anything, we confirm your exact vehicle by registration.
MODEL
Confirm your exact model and variant.
GENERATION
Identify the correct generation (X308, X100).
DRIVETRAIN
Drivetrain and ancillary specification.
CONFIRMED BY REGISTRATION
We confirm by registration/VIN before quoting or supplying anything.
Jaguar AJ27
Applications We Work On
AJ26/AJ27 in the XJ XJ8 (X308, 1997-2003)
The AJ26 and AJ27 in the XJ XJ8 is one of the applications we work on regularly. The 4.0-litre V8 defined the X308 generation's character, and we've seen these engines through numerous rebuilds over the years.
Starting from:
£4,500
AJ26/AJ27 in the XK XK8 (X100, 1996-2004)
The AJ26 and AJ27 in the XK XK8 is one of the applications we work on regularly. The naturally aspirated 4.0-litre V8 powers the XK8, while the supercharged AJ27S powers the XKR - both applications are within our rebuild scope. Jaguar AJ27 by Powertrain Variant AJ26/AJ27 Naturally Aspirated Applications: XJ XJ8 (X308), XK XK8 (X100). Standard rebuild scope - timing chain components, bearings, gaskets. AJ27S Supercharged Applications: XK XKR (X100). Supercharged variants carry the additional supercharger ancillaries, which we account for alongside the standard rebuild scope.
Starting from:
£4,500
MODEL
Jaguar XJ X308
ENGINE
AJ27 4.0L
YEAR
1997 - 2003
STARTING FROM
£4,500
Not seeing your exact model above? Send us your registration and we'll confirm your exact spec.
OUR WORKSHOP VIEW OF
THE JAGUAR AJ27
Built, rebuilt and tested by engineers who work on Jaguar engines every day.
Here's our practical view of the AJ27 across its XJ X308, XK X100 applications.
APPLICATIONS WE SEE:
The AJ26 and AJ27 are found across the XJ XJ8 (X308) and XK XK8/XKR (X100). The supercharged AJ27S is also present in XKR models, carrying additional ancillaries.
WHAT WE REPLACE:
Timing chain components, bearings, and gaskets as standard on every rebuild. Supercharger components are also inspected on AJ27S applications.
KNOWN ISSUES:
The AJ26 and AJ27 are known for timing chain tensioner failure - plastic tensioners fail, and primary guides crack and break off, with pieces ending up in the sump. Early engines also suffered from Nikasil cylinder lining issues with high-sulphur fuel; later engines (from around 2002) use cast-iron linings. We inspect the timing chain system thoroughly on every rebuild and assess cylinder bore condition as part of the strip-down process.
AJ27 REBUILD INFORMATION
Typical rebuild scope:
A TYPICAL
JAGUAR AJ27 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 AJ27's timing chain system is a known critical wear point on early AJ-V8 engines (1997-2000), with plastic chain tensioners failing and primary guides cracking and breaking off. We inspect the timing chain tensioners and guides thoroughly on every rebuild. Supercharged AJ27S variants (XKR) require additional specialist attention to the supercharger system. Full engine replacements require DME software matching.
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:
Timing chain components, bearings, gaskets, plus supercharger inspection on AJ27S applications
Starting From:
£4,500
Jaguar AJ27
ENGINE REBUILD COST
A Jaguar AJ27 engine rebuild starts from £4,500 - the same price tier for both the naturally aspirated AJ26/AJ27 and the supercharged AJ27S, with the latter carrying additional supercharger-specific work.
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
£4,500
Get a fixed-price quote within 30 minutes.
MODEL
Jaguar XJ X308
ENGINE
AJ27 4.0L
YEAR
1997 - 2003
STARTING FROM
£4,500
JAGUAR AJ27 REBUILD VS REPLACEMENT VS USED
Rebuilding Your AJ27 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 AJ27 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 AJ27 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 AJ27 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 AJ27 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 AJ27 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 AJ27 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, regardless of which of the two AJ27-equipped models you drive. 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 AJ27FIXED-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.
