Mercedes W207 OM642 Diesel Engine Auxiliary Cooling Water Pump R642201110

Mercedes W207 OM642 Diesel Engine Auxiliary Cooling Water Pump is an original cooling system component designed for diesel engines of this series. Thanks to its factory design, it ensures stable heat dissipation from the power unit, which translates into a safe engine operating temperature and predictable performance in all conditions. The used pump is a reasonable, economical choice while maintaining the original manufacturer's specifications.

Specifications and technical data

• SKU: R6422011110
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: R6422011110
• Substitutable numbers: R6422011110, R 642 201 11 10
• Fuel type: Diesel
• Category: Water Pumps

Purpose and role in the cooling system

The water pump in the OM642 diesel engine is responsible for the forced circulation of coolant between the engine block, cylinder heads, and the heat exchanger. A properly functioning component of this class:

• stabilizes the operating temperature of the power unit under continuous load,
• reduces the risk of overheating in urban and highway conditions,
• supports uniform heat dissipation from the entire cooling system.

For diesel-powered engines, proper coolant circulation is crucial for the durability of components, including cylinder heads, gaskets, and engine accessories.

Benefits of using an original water pump

Using a water pump dedicated to the OM642 unit allows you to maintain the parameters specified by the vehicle manufacturer. The original design ensures:

• fitment to the factory cooling system without the need for modifications,
• correct fluid flow characteristics across the full RPM range,
• consistency with other engine accessory components.

As a result, replacing a worn-out part with an original Mercedes water pump helps restore stable operating conditions for the power unit and reduces the risk of secondary failures related to overheating.

Selection and technical compatibility

Precise selection of a water pump for a specific vehicle configuration is particularly important in the case of modern diesel engines. It is recommended to verify compatibility based on:

• engine designation,
• manufacturer's catalog data,
• comparison of the design with the removed part.

The product has an assigned OEM part number and interchangeable numbers, which facilitates clear identification in catalogs and service systems, and minimizes the risk of installing an incorrect component.

Product condition and service application

The water pump is offered in a used condition, which allows for an economical repair of the cooling system while maintaining the original design. This type of component is suitable for:

• routine repairs after a cooling system failure,
• preventive maintenance at higher mileages,
• rebuilding the power unit after a major overhaul.

A properly selected and functional water pump supports stable diesel engine operation, which has a direct impact on performance, fuel consumption, and the durability of other components.

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 circulation pumps, additional cooling pumps, or auxiliary circulation modules, check the available parts in the Mercedes water pumps category.

Technical support and service knowledge

When working with diesel units, it is worth using reliable sources of knowledge regarding engine accessories and cooperating systems. In the context of diesel engines, material describing related fuel supply systems, diagnostics, and part selection by catalog numbers may be helpful – detailed information can be found in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration", which facilitates the planning of comprehensive service work on modern diesel units.