Engine 642862 Mercedes W221 S 350 BlueTEC Bare Engine 642.862 OM642 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.).

Engine 642862 Mercedes W221 S 350 BlueTEC Bare Engine 642.862 OM642 WARRANTY is a used, original bare engine block from dismantling, designed for diesel units in the S-Class W221 generation. The bare engine base provides a solid foundation for professional repair or a complete rebuild of the powertrain, allowing you to maintain factory performance characteristics and consistency with Mercedes factory architecture.

Specifications and technical data

• SKU: A6420103945
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420103945
• Substitutable numbers: A6420103945, A 642 010 39 45, A6420104148, A 642 010 41 48
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Mileage: 124 900

Technical characteristics of the engine block

The presented engine block belongs to the Engines category and is designed for a diesel unit, which means a construction optimized for high torque and economical operation. The six-cylinder configuration ensures smooth operation, good flexibility across the entire rev range, and stable conditions for further accessory installation.

The bare engine block includes the basic block with the cylinder assembly, serving as a starting point for transferring accessories from the existing unit or building it up with other components. This form is particularly beneficial in cases of severe mechanical damage to the previous engine, when a complete yet flexible base for further configuration is needed.

Application in Mercedes W221 S 350 BlueTEC

The bare engine block is dedicated to Mercedes S-Class W221 models in the S 350 BlueTEC version, where maintaining compliance with the manufacturer's factory solutions is essential. Thanks to the original design, it is possible to transfer accessories, wiring harnesses, and auxiliary components from the previous unit, which facilitates integration with the vehicle's electronics and existing installation.

The six-cylinder diesel layout is well-suited for luxury class vehicles, providing the right balance between dynamics and fuel consumption. Replacing the block with an original component from dismantling allows you to restore proper powertrain operation while maintaining the characteristics intended for the BlueTEC version.

Benefits of choosing a used engine block

Choosing a used engine block for a Mercedes W221 S 350 BlueTEC is a solution that often significantly reduces repair costs compared to purchasing a complete, new unit. You receive a structural base consistent with factory standards, which facilitates installation and reduces the risk of fitment issues.

The unit's mileage allows you to assess the degree of wear and plan further service actions, such as checking cooperating elements or potential regeneration of selected sub-assemblies. This type of solution is particularly attractive for workshops specializing in the Mercedes brand and for users who want to restore the car's efficiency while maintaining reasonable costs.

To better understand the specifics of purchasing used power units and the process of selection by identification numbers, it is worth reading our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths.

Professional selection and vehicle integration

When selecting an engine block for a Mercedes, it is crucial to verify compatibility with the unit designation and part numbers, which helps avoid problems with assembly and electronics. An original block from the same engine family facilitates the transfer of accessories, maintaining correct mounting geometry, and cooperation with the factory engine control unit.

This type of solution is especially recommended in situations where the existing block has suffered mechanical damage (e.g., cracking, seizing) and further operation is not possible. Replacing it with a complete block from dismantling allows for a shorter repair time compared to the process of a full block overhaul.

Expanding repairs within the powertrain

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

When deciding on the scope of repair, it is also worth considering the alternative between regeneration and installing a used, original component. A guide comparing these approaches may be helpful: Regenerated or used original – which part to choose for repairs?.