Mercedes W204 Engine 651911 Complete Engine C 220 CDI OM651 651.911 WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.

The warranty covers the engine itself; engine accessories are covered by a 30-day warranty.

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

Listing details

The offer applies to a complete engine.

The engine comes from a right-hand drive (RHD) vehicle. The wiring harness is not compatible with left-hand drive (LHD) vehicles and requires replacement or modification.

Mercedes W204 Engine 651911 Complete Engine C 220 CDI OM651 is a used power unit from the OM651 family, designed for Mercedes diesel vehicles. This is a solution for users who are looking for a technically advanced, four-cylinder diesel engine with a proven design and want to reduce repair costs by installing a complete engine. By maintaining the factory specifications of the powertrain, the engine allows for the preservation of original performance parameters and compatibility with the vehicle's electronics.

Specifications and technical data

• SKU: A6510106907-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510106907
• Substitutable numbers: A6510106907, A 651 010 69 07, A6510103017, A 651 010 30 17, A6510107307, A 651 010 73 07, A6510104618, A 651 010 46 18, A6510109698, A 651 010 96 98
• Fuel type: Diesel
• Number of cylinders: 4
• Category: Engines
• Mileage: 86900

Technical characteristics of the OM651 unit

The presented engine belongs to the modern family of Mercedes diesel units, designed with efficiency and refinement in mind. The four-cylinder layout provides a favorable compromise between dynamics and fuel consumption, and the use of diesel technology allows for high torque at low engine speeds. The unit is optimized for daily operation, highway driving, and fleet use, where durability and predictable powertrain behavior are essential.

The OM651 engine in the version used in the C220 CDI model is known for its good compatibility with both automatic and manual transmissions, as well as with Mercedes' factory engine control systems. Thanks to this, after proper installation and ECU adaptation, it is possible to maintain stock injection maps, start-stop functions (if present in the specific vehicle), and full integration with the vehicle's safety systems.

Application in Mercedes W204 C220 CDI

The engine from the Engines category has been designed as a power unit for the Mercedes C-Class W204 generation in the C220 CDI version. The appropriate configuration of accessories, mounting points, and fuel system makes it the correct base for replacing a damaged engine in this model without the need for structural modifications in the engine bay.

In practice, this means that while maintaining the compatibility of accessories and control systems, the installation of this unit allows for:

• restoring the factory performance characteristics of the powertrain,
• maintaining proper cooperation with the drivetrain and accessory drive,
• maintaining stock emission parameters (with a functional exhaust system and accessories),
• reducing vehicle downtime in the workshop.

Condition, mileage, and benefits of purchasing a used engine

The offered unit is a used component, which allows for a significant reduction in repair costs compared to purchasing a brand-new engine. The declared mileage allows for an initial assessment of the wear level, and thus better planning of further maintenance after installation. Purchasing a complete used engine is particularly beneficial in situations of severe damage, such as seizing or a cracked block, where repairing the existing unit is economically unjustified.

Before installation, standard service procedures are recommended, such as changing the oil and filters, and checking the injection and cooling systems. This approach increases the chances of long-term and stable operation of the unit after replacement, and also facilitates subsequent diagnostics of any operational faults.

Replacement and installation recommendations

The OM651 engine requires precise installation in accordance with the manufacturer's procedures, particularly regarding timing settings, fuel system bleeding, and correct electrical wiring connection. Installation in a specialized workshop is recommended, which has experience with Mercedes diesel units and access to appropriate computer diagnostics.

During replacement, it is worth paying attention to:

• the condition of the cooling system (radiator, hoses, thermostat),
• the tightness of the intake and exhaust systems,
• the efficiency of accessories working with the engine (e.g., auxiliary drive components),
• updating the engine control unit software, if recommended by the manufacturer.

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 complete power units, long blocks, or engine blocks, check the available parts in the Mercedes Engines category.

Technical support and knowledge about power units

When choosing a used engine, it is worth relying on reliable knowledge about typical problems and repair costs of modern power units. For comparison with other brands and a better understanding of how engine failures can affect your operating budget, the article describing critical units in a popular model of a competing brand will be helpful – you can find it here: Troublesome BMW E90 engines: check what can ruin your budget!.

Additionally, with every engine replacement, it is crucial to ensure a functional cooling system, which directly affects the engine's lifespan. Practical tips regarding overheating, diagnostics, and cooling system repair can be found in the guide: Engine cooling system – overheating, repair, and used radiators.