Land Rover L551 L550 L560 Jaguar XF XE Bare Engine AJ20D4 AJ21D4 49k, WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a bare engine.

The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

Land Rover L551 L550 L560 Jaguar XF XE Bare Engine AJ20D4 AJ21D4 is a used, complete engine block assembly designed for modern diesel units from the Jaguar Land Rover group. This is a solution for users who want to restore the efficiency of the powertrain in a controlled and technically correct manner, while maintaining factory performance characteristics. By retaining the original engine design, you gain a stable base for further accessory installation and precise repair.

Specifications and technical data

• SKU: LR140108
• Mark: Land Rover
• Condition: Used
• OEM Part Number: LR140108
• Substitutable numbers: LR140108, M4D36006BA, M4D3-6006-BA
• Fuel type: Diesel
• Number of cylinders: 4
• Part type: Engine Long Block
• Category: Engines
• Engine code: AJ20D4 AJ21D4
• Mileage: 49 000

Technical characteristics of the engine block

The presented bare engine belongs to a family of modern diesel units used in Land Rover L551, L550, L560 series models, as well as Jaguar XF and XE vehicles. The design is based on a four-cylinder layout, which provides a favorable compromise between refinement, powertrain weight, and operating economy. The use of diesel fuel allows for high torque at low and medium engine speeds, which is particularly important in SUV segment vehicles and premium class cars.

The engine from the AJ20D4 / AJ21D4 family was designed to meet strict emission standards and to work with advanced control systems. The bare engine serves as a base for transferring accessories from the previous unit – this solution is often chosen in professional workshops because it enables compatibility with the vehicle's electronics and existing installation.

Application in Land Rover and Jaguar – compatibility and selection

The offered engine block is intended for Land Rover and Jaguar vehicles that were factory-equipped with units from the AJ20D4 / AJ21D4 family. In practice, this means it can be used in popular Land Rover SUV models (L551, L550, L560) as well as Jaguar XF and XE sedans, provided that the correct selection is made based on the engine code and vehicle data.

To ensure proper compatibility, it is recommended to select the unit based on the engine code and vehicle identification data. This approach minimizes the risk of mechanical and electronic incompatibility and facilitates the transfer of accessories, wiring harnesses, and control elements from the previous engine. In case of doubt, it is worth consulting a mechanic or technical advisor who will verify compatibility based on catalog numbers and engine parameters.

Benefits of installing a used bare engine

Choosing a used engine from the AJ20D4 / AJ21D4 family is a solution that allows for significant repair cost savings compared to purchasing a brand-new unit. The bare engine provides a solid foundation for engine rebuilding, especially in situations where the block, crankshaft, or cylinder assembly has been damaged, but some of the accessories are still suitable for reuse.

In practice, such a solution is often used in specialized workshops dealing with premium brands, as it enables:

• maintaining the original engine specification in the vehicle,
• transferring functional accessories from the previous unit,
• controlling repair costs while maintaining a high level of quality,
• reducing vehicle downtime compared to a full rebuild of the old block.

An additional advantage is the possibility of a thorough assessment of the engine's condition before installation and performing preventive maintenance (e.g., replacing seals, checking cylinder bores) before it is installed in the vehicle.

Condition, mileage, and operational aspects

The engine comes from the used engines category, which means it was previously operated in a vehicle but retains parameters that allow for further use after proper installation and initial service. The declared mileage of the unit is important information for the workshop – it allows for assessing the potential for further operation and planning any preventive measures, such as checking the crankshaft-piston system or verifying tightness.

When installing a used engine, standard workshop procedures are recommended: thorough cleaning of oil channels, use of fresh operating fluids, new filters, and verification of cooperating components (clutch, dual-mass flywheel, fuel injection system). Such an approach increases the chance of trouble-free operation after replacement and reduces the risk of unplanned vehicle downtime.

Expert support and selecting a used engine

If you want to better understand how to safely and consciously choose used power units, it is worth checking out expert materials. Practical tips on verifying condition, selection by VIN and catalog numbers, and cost comparisons can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths. This is a helpful supplement to your knowledge before making the decision to install a used engine in your Land Rover or Jaguar.

If you are planning a comprehensive repair or upgrade of the engine area in your Land Rover and need other components from the same group, such as cylinder heads, blocks, or complete power units, check the available parts in the Land Rover Engines category.