Engine 642830 Mercedes W204 S204 C 350 CDI Bare Engine 642.830 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 642830 Mercedes W204 S204 C 350 CDI Bare Engine is a used, complete engine block in a bare engine configuration, designed for installation in C-Class models from the W204/S204 family. This is a solution for users and workshops that want to restore the efficiency of the powertrain in a controlled manner, while maintaining the factory engine performance characteristics. By preserving the original architecture of the unit, you gain a solid foundation for professional repair or engine replacement.

Specifications and technical data

• SKU: A6420100398
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420100398
• Substitutable numbers: A6420100398, A 642 010 03 98, A6420102043, A 642 010 20 43
• Fuel type: Diesel
• Number of cylinders: 6
• Category: Engines
• Mileage: 99 900

Technical characteristics of the unit

The offered bare engine belongs to the Engines category and is intended for Mercedes vehicles from the C 350 CDI family. The design is based on a V6 layout, which ensures high refinement, good flexibility, and stable torque delivery across a wide rev range. The use of a diesel fuel system allows for an advantageous balance between dynamics and fuel consumption, while maintaining the mechanical durability characteristic of this series.

The bare engine serves as the foundation of the entire powertrain – it includes key mechanical components which, after proper refitting with accessories from your vehicle, allow for the restoration of full engine functionality. This configuration is particularly valued by workshops specializing in the Mercedes brand, as it enables precise matching of accessories to the specific equipment version of the car.

Purpose and application in Mercedes W204/S204

The engine in the form of a bare unit is dedicated for use in C-Class W204 and S204 generation models in the C 350 CDI version. This type of unit will prove useful both for post-accident repairs and for replacing a worn or damaged engine in cars used intensively, e.g., on long routes or in fleet applications. Thanks to the preservation of the original design specifications, it is possible to maintain the factory operating parameters of the powertrain without the need to interfere with the control electronics.

A used bare engine allows for optimizing repair costs compared to purchasing a brand-new unit, while maintaining high installation compatibility. This solution is particularly beneficial for independent service centers and individual customers who expect a reasonable compromise between price and durability.

Benefits of choosing a used bare engine

Choosing a used engine in a bare configuration provides a number of practical technical and economic benefits. You receive a base that can be:

• refitted with existing accessories from your vehicle, maintaining its individual configuration,
• thoroughly inspected for mechanical condition before installation,
• adapted to the requirements of a specific equipment version without interfering with the block structure.

A used unit also allows for reducing vehicle downtime – the workshop can prepare the bare engine for installation in parallel with the removal of the old engine. This is a practical solution for professional service centers and conscious users who want to restore the car's efficiency while maintaining control over the scope of work and costs.

To better understand how to safely choose used powertrains and gearboxes, it is worth reading our expert guide: Why it is worth buying used gearboxes and engines – facts instead of myths. You will find practical tips there regarding selection by OEM numbers and cost-effectiveness analysis of repairs.

Condition, mileage, and installation aspects

The engine is offered as a used item, which in practice means that a standard service procedure is recommended before installation – checking for leaks, verifying the condition of seals, and preparing mounting surfaces. Information about the mileage allows the workshop to better plan the scope of preventive maintenance, such as replacing selected wear-and-tear parts during the swap.

The bare engine is particularly convenient to install for experienced mechanics, as it allows for the transfer of accessories from the previous unit, preserving the vehicle's original design solutions. Such a configuration facilitates maintaining consistency with the factory installation and minimizes the risk of compatibility issues.

Expanding work in the powertrain area

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

For larger repair projects within the drivetrain, it is also worth paying attention to the condition of the differential and other drive components. A guide describing the practical aspects of purchasing used components may be helpful: what you need to know about used differentials and drivetrains. Thanks to this, you will be able to better plan the full scope of work and avoid unnecessary costs in the future.