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  • 12 months warranty
  • Fully Equipped Garage
  • Jaguar Engine Specialists
  • High End Diagnostics
  • Experienced Team of Mechanics

5 Star rated by our Customers  


Fast Turnaround Jaguar XJ Engine Replacement – Petrol & Diesel Engine Supplied and Fitted UK

The heart of a luxury vehicle should beat smoothly. When a Jaguar XJ experiences engine issues – from turbo whine on the 3.0 L V6 diesel to overheating on an older 4.2 V8 petrol – performance, mileage, and confidence all suffer. At Royal Rebuilds, we solve those problems every day. We stock and remanufacture complete Jaguar XJ engines – V6 and V8, petrol and diesel, X350 and X358 – ready for quick delivery or in house supply and fit in our independent garage. Many drivers save up to 50% compared with buying a new unit, and every engine leaves our workshop with a warranty of up to 12 months and no mileage limit.

No matter whether you need a low mileage used engine, a fully reconditioned Jaguar XJ 3.0 diesel, or a 4.2 petrol V8 built from the block up, our specialists match the right engine code to your chassis, recover your vehicle if it is not drivable, and hand your car back after the proper testing and inspection. That means 100% satisfaction without the guesswork.

Your Independent Jaguar XJ Engine Specialists: Used and Reconditioned Jaguar Engine for Sale

As a JLR-focused supplier, we maintain a stock of high quality engines, ranging from reconditioned AJ-V6 diesel engines to late-model 5.0 V8s. Each unit is stripped, measured, and rebuilt with OEM grade parts during engine reconditioning. Block faces are skimmed, crankshafts balanced, auxiliary pumps tested, and turbos inspected for correct boost. Whether you choose a reconditioned or a used engine, you receive:

  • Supply and fit or delivery only – engines can be fitted in our workshop or shipped to your chosen garage the next working day.
  • Vehicle recovery service – vehicle recovery option if your XJ has suffered engine failure.
  • Flexible warranty – up to 12 months, with length depending on the parts and type of engine you select.
  • Unlimited-mileage cover for the period of the warranty.
  • Post-installation checks – oil pressure, coolant flow and ECU diagnostics recorded for your records.

Add competitive online prices, an experienced fit service team, and transparent communication with expert technicians, and it is easy to see why owners of Jaguar, Land Rover and Range Rover vehicles trust our engine solution first.

Jaguar Xj for sale Jaguar Xj for sale

Frequently Asked Questions

A specialist will confirm engine failure by checking compression, oil pressure and any unusual knocking or smoking before recommending recon or replacement.
Yes – 3.0 L V6 diesel engines, 2.7 V6 diesel, 4.2 V8 petrol and newer 5.0 V8 petrol units are all held in our engines in stock list.
A used engine is a low mileage complete engine removed from a donor car, while a reconditioned engine is stripped and rebuilt with new internal parts for the best quality and reliability.
If the exact engine code is on the shelf, we can arrange recovery, engine fitted, and hand-back within seven to ten working days, subject to workshop space.
Absolutely – we match engine codes for both chassis generations, including the 3.0 L V6 diesel and 4.2 V8 petrol options.
During the agreed warranty period (up to 12 months) there is no mileage cap; coverage terms depend on the parts and engine type you choose.
Savings are typically up to 50% of main-dealer list pricing thanks to our reconditioning and low-mileage sourcing model.
Yes – every complete engine is delivered with matching turbo, injectors, and key sensors unless you request a bare long-block.
Certainly. We ship throughout the UK with fitting notes so any competent garage can install the engine for your Jaguar XJ.
Our livestock database covers AJ-V6D, 306DT, and other engine codes; if none are available, we can remanufacture yours or source a suitable donor.
Performance and durability are restored to factory standards, often with upgraded bearings and gaskets for longer life.
Yes – our workshop handles Jaguar Land Rover and other 4x4 vehicles, but Jaguar XJ engines remain a core speciality.
If safe, yes. If not, use our vehicle recovery service, included in many replacement engine packages.
A healthy recon or low-mileage engine restores correct combustion and turbo boost, often improving mpg over a tired unit.
A full remanufacture averages three to four weeks, depending on parts availability and machining workload.
All wear items such as timing chains, seals, and bearings are replaced to ensure reliability.
Engine swaps outside the original spec require ECU, exhaust and drivetrain changes; our engineers can advise on feasibility.
We target low-mileage donor units, typically under 60-80k miles, and verify readings through service records where possible.
We can recommend trusted finance partners; please ask during your quotation.
Call, email, or enter your registration online; we cross check the engine code and reply with an exact supply-and-fit or delivery price, usually within an hour.
From recon to replacement, Royal Rebuilds delivers the right engine for your Jaguar XJ – quickly, expertly, and at a competitive price that keeps your luxury car on the road.

Reconditioning Process Explained

Engine dismantling process Royal Rebuilds

Dismantling

Each engine is first stripped down to its bare components. Using specialist cleaning equipment (Kerosene bath and high temperature solvent washer) all engine components are degreased and thoroughly cleaned.

Cylinder head machining & testing Royal Rebuilds

Machining

After disassembling the units they are then sent for machining where all engine block cylinders are professionally honed, All cylinder heads are pressure tested, skimmed, valve seats are cut and all valves are resurfaced.

Engine assembly with OEM parts Royal Rebuilds

Assembly

In assembly stage of the engine reconditioning process, brand new Eristic gaskets are used, ACL bearings are used for the mains and big ends and gas nitride piston rings are fitted to ensure quality parts are used throughout. Crankshaft journals are checked and measured to assess condition and then are polished or reground where necessary Also the engine is timed up with a brand new timing kit.

Engine quality control inspection Royal Rebuilds

Quality Control

All throughout the assembly process strict quality control measures are enforced. All measurements are double checked to make sure the final product is reliable for years to come.

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