Land Rover Garage - LAND ROVER ENGINE SPECIALISTS
Land Rover technician rebuilding an engine block

Land Rover Defender D350 Engine Rebuild - From £2,800

Specialist Land Rover Defender D350 engine rebuilds and replacements, with registration-based engine matching, nationwide recovery and a 12-month unlimited-mileage warranty

Rated Land Rover 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

Ingenium AJ300D Specialists

GB

Your Land Rover Defender D350 Engine

Land Rover turbocharged engine

Vehicle

Land Rover Defender D350

Model

Defender

Variant

Defender D350

Fuel

Diesel MHEV

Engine

AJ300D

Capacity

3.0L I6

Generations

L663 (2019-present)

Rebuild From

£2,800

?

Not sure which engine you have?

The Defender D350 uses the AJ300D 3.0-litre inline-six mild-hybrid engine - enter your registration below and we'll confirm your exact spec before you get a quote.

GB

DVLA & VIN verified

100% secure & private

No obligation quote

Land Rover Defender D350 Engine Rebuild Price

Starting From £2,800

AJ300D engine

Engine Code

AJ300D

Rebuild From

£2,800

L663 (2019-present)

Generation

L663 (2019-present)

Exact price depends on condition and parts required - submit your reg for a fixed-price quote.

Get Your Fixed-Price Quote

Land Rover Defender D350 DC-DC Converter & Timing Chain

Defender D350 engines with the Ingenium AJ300D - fitted across the L663 generation - are part of the Ingenium diesel family. The timing chain pattern is well-documented across this engine family, and the DC-DC converter failure pattern applies to mild-hybrid variants (which the D350 is). The DC-DC converter is a single point of failure for the entire 12V electrical system - failure causes complete loss of electrical power, sometimes while driving. We replace the DC-DC converter, timing chain components, injector seals, bearings and gaskets as standard on every AJ300D rebuild.

Early production D350s (2019-2020) also show electrical injector faults, which we inspect and replace as part of the rebuild.

Source: verified via specialist buying guide (l663.guide), independently corroborated, per VRF-landrover-defender.md. Confirmed for AJ300D (D250/D300/D350) MHEV Ingenium variants. P300 (no MHEV) and Octa (BMW's own 48V hardware) explicitly excluded from this specific pattern

Land Rover engine block

Land Rover Defender D350 ENGINE OPTIONS

Every Defender D350 is different. That's why we offer the right solution for your engine, your car and your budget.

01MOST POPULAR

REBUILDING YOUR DEFENDER D350 ENGINE

Most engine suppliers sell you a used engine of unknown history and hope it matches. We rebuild the engine your Defender D350 already has instead - strip it down, pressure-test it, and replace every worn or damaged component (timing chain, injector seals, bearings, gaskets, DC-DC converter) 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 Defender D350 owners choose, and it's the one we'd recommend for most situations.

From £2,800
02

RECONDITIONED DEFENDER D350 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 DEFENDER D350 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 DEFENDER D350 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 AJ300D.

Learn more
05

REPLACEMENT DEFENDER D350 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 DEFENDER D350 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 AJ300D and talk you through the best solution for your Defender D350, honestly.

Ask About Your Options

OUR WORKSHOP

RECOVERY COLLECTION01

RECOVERY COLLECTION

AJ300D ENGINE STRIPPED FOR REBUILD INSPECTION02

AJ300D ENGINE STRIPPED FOR REBUILD INSPECTION

VALVE COVERS & COOLANT COMPONENT WORK03

VALVE COVERS & COOLANT COMPONENT WORK

TECHNICIANS AT WORK04

TECHNICIANS AT WORK

ENGINE TESTING (RIG)05

ENGINE TESTING (RIG)

COMPLETED & READY FOR REFIT06

COMPLETED & READY FOR REFIT

Real photos from our workshop - not stock imagery. This is what a genuine Land Rover Defender D350 rebuild looks like.

Land Rover Defender D350 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, bearings, water pump and gaskets 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 Defender D350.

10Road Test

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

WHAT LAND ROVER Defender D350 OWNERS SAY

Daniel R.

“Brilliant service from start to finish. My Defender D350 runs smoother than ever. Honest advice, clear pricing and the team know their stuff.”

Land Rover Defender D350 Engine Rebuild

Mark T.

“They rebuilt my AJ300D with all the updated parts. Smooth process and great communication throughout.”

Land Rover Defender D350 Engine Rebuild

Ryan P.

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

Land Rover Defender D350 Engine Rebuild

Steve B.

“Saved me thousands compared to a dealer quote. Fantastic workmanship and my Defender D350 is running perfectly.”

Land Rover Defender D350 Engine Rebuild

Tom H.

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

Land Rover Defender D350 Engine Rebuild

James K.

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

Land Rover Defender D350 Engine Rebuild

WE COVER YOUR EXACT VEHICLE

Enter your registration below and we'll confirm your Land Rover Defender D350 has the AJ300D, along with an exact rebuild price.

GB
FastAccurateNo Guesswork

WHY LAND ROVER Defender D350 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 RECENT LAND ROVER 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.

Land Rover Defender D350

Land Rover Defender D350

RECOVERY

Land Rover Defender D350

Land Rover Defender D350

DIAGNOSTICS

Land Rover Defender D350

Land Rover Defender D350

STRIPPED ENGINE

Land Rover Defender D350

Land Rover Defender D350

TIMING CHAIN REPLACEMENT

Land Rover Defender D350

Land Rover Defender D350

IN FOR REBUILD

Land Rover Defender D350

Land Rover Defender D350

REBUILD IN PROGRESS

HOW IT WORKS

1

SEND YOURREGISTRATION

2

RECEIVE YOURFIXED-PRICE QUOTE

3

WE RECOVERYOUR CAR

4

REBUILD &REFIT

Most Defender 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 OR REPLACEMENT ENGINE INSTEAD?

We supply low-mileage, VIN-matched used units too, and offer full replacement and fitting. However, most Defender D350 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.

Ask About Used Engine Options

ABOUT THE Land Rover Defender D350 ENGINE

Land Rover engine and vehicle

The Defender D350 is part of the modern L663 generation, launched in 2019. It uses the Ingenium AJ300D - a 3.0-litre inline-six diesel mild-hybrid. It's the highest-output diesel in the Defender range, positioned above the D250 and D300. The AJ300D is a genuine six-cylinder unit (not a 4-cylinder derivative), and it sits on a different price tier from the 4-cylinder Defender diesel variants.

We continue to rebuild and replace AJ300D engines for every Defender D350 on the road.

Land Rover Defender D350 ENGINE CODES

A 3.0-litre inline-six diesel MHEV fitted to the Defender D350 from 2019 to present (L663 generation). Known for the DC-DC converter failure pattern affecting the entire 12V electrical system on mild-hybrid variants, plus the broader Ingenium timing chain pattern. Early production (2019-2020) also shows electrical injector faults. We replace timing chain components, injector seals, bearings, gaskets and the DC-DC converter as standard on every AJ300D rebuild.

Check Your AJ300D Defender D350

Land Rover Defender D350 ENGINE COMPATIBILITY

Land Rover Land Rover vehicle in workshop

The Defender D350 uses the AJ300D across the entire L663 generation. When quoting or supplying an engine for your D350, we confirm:

Your exact engine code (AJ300D) via registration or VIN

Your generation (L663)

Drivetrain and ancillary specification

Whether your build falls in the early production period (2019-2020) for injector fault coverage

This is why we always start with your registration rather than a generic Defender quote - it protects you from paying for parts that don't fit your actual car.

Land Rover Defender D350 APPLICATIONS BY GENERATION

Generation

Chassis

Years

Engine Code

Fuel

L663

L663

L663

2019-present

AJ300D

Diesel MHEV

Land Rover Defender D350 ENGINES BY YEAR

Land Rover Defender D350 has used the AJ300D throughout. If you're unsure of your exact spec, we'll confirm it before you book.

Year

Generation

Engine Code

Fuel

Service

2019

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2020

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2021

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2022

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2023

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2024

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2025

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

2026

L663

AJ300D

Diesel MHEV

Rebuild / Replacement

i

The AJ300D has been fitted to every Defender D350 since launch - if your registration year isn't listed above, get in touch and we'll confirm availability directly against your reg.

WE COVER EVERY Land Rover Defender D350 MODEL YEAR:

Land Rover Defender D350
2019 Engine Rebuild

Land Rover Defender D350
2020 Engine Rebuild

Land Rover Defender D350
2021 Engine Rebuild

Land Rover Defender D350
2022 Engine Rebuild

Land Rover Defender D350
2023 Engine Rebuild

Land Rover Defender D350
2024 Engine Rebuild

Land Rover Defender D350
2025 Engine Rebuild

Land Rover Defender D350
2026 Engine Rebuild

If your registration year or model isn't listed above, get in touch - we'll confirm availability directly against your reg.

Land Rover Defender D350 ENGINE COSTS

A Land Rover Defender D350 engine rebuild starts from

£2,800

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.

Land Rover engine

12 MONTH

UNLIMITED-MILEAGE

WARRANTY

LAND ROVER Defender D350 ENGINE SIZES

• Land Rover Defender D350 3.0 Litre Engine (AJ300D, I6)

LAND ROVER Defender D350 FUEL TYPES

• Land Rover Defender D350 Petrol Mild Hybrid Engine Rebuilds

Most Land Rover Defender D350 engine rebuilds are completed within 3-5 working days.

Nationwide recovery and collection available for all Land Rover Defender D350 models.

Land Rover vehicle recovery and collection

FREQUENTLY ASKED QUESTIONS

Land Rover vehicle in a dark showroom

GET YOUR FREE LAND ROVER Defender D350 FIXED-PRICE QUOTE

Most quotes returned within 30 minutes during working hours.