Mercedes-Benz W164 W211 W212 OM642 Diesel Engine Coolant Water Pump A6422002201

The Mercedes W164 W211 W212 OM642 Water Pump is an original part from the Water Pumps category, designed for OM642 diesel engines fitted in popular Mercedes SUV and sedan models. Its placement at the front of the vehicle ensures easier service access and predictable operating conditions within the cooling system. This is a solution for users seeking a proven, factory-built design instead of random aftermarket alternatives.

Specifications and technical data

• SKU: A6422002201
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6422002201
• Substitutable numbers: A6422002201, A 642 200 22 01, BG
• Location on the vehicle: Front
• Fuel type: Diesel
• Category: Water Pumps

Purpose and Compatibility with OM642 Engine

The presented water pump has been designed to work with the OM642 unit, a popular diesel engine used in many Mercedes-Benz upper-class models. The pump's construction is adapted to the thermal characteristics of the diesel engine, which translates to stable maintenance of operating temperature and proper coolant circulation throughout the system.

Its front placement on the vehicle contributes to predictable mechanical and thermal load, and also facilitates diagnostics and potential replacement in workshop conditions. This makes the pump well-suited to the service requirements of intensively used vehicles – both in city traffic and on longer journeys.

Technical and Constructional Characteristics

The water pump belongs to the Water Pumps category, meaning it is a key component of the cooling system responsible for forced fluid circulation. The design intended for diesel engines ensures adequate performance under higher thermal loads typical for high-pressure units.

The factory Mercedes solution is characterized by its precise fit to original cooling channels, spigots, and mounting points, which reduces the risk of leaks and installation problems. The use of original impeller and housing geometry allows for maintaining flow parameters in line with the vehicle manufacturer's specifications, which is important for the durability of the engine, turbocharger, and ancillaries.

Condition, Origin, and Advantages of a Used OEM Part

The offered water pump is a used part, originating from the original Mercedes production line. In practice, this means a factory fit for the OM642 unit and no need for installation modifications or additional adapters. For many users and workshops, this is a more predictable solution than random aftermarket parts with uncertain specifications.

Choosing a used OEM pump offers several practical advantages:

• maintaining factory geometry and flow parameters in the cooling system,
• certain fit to mounting points and ancillaries in the engine bay,
• no need for modifications to hoses and associated components.

If you want to better understand when a used original part is a sensible choice, the article might be helpful: 5 Reasons Why a Used OEM Part is a Better Choice Than an Aftermarket Replacement.

Role of the Water Pump in a Diesel Engine Cooling System

In a diesel engine, a properly functioning water pump is crucial for maintaining a stable operating temperature. It is responsible for the forced circulation of coolant through the engine block, cylinder heads, radiator, and other system components. Insufficient pump performance can lead to overheating, reduced durability of seals, and in extreme cases, damage to the powertrain.

In modern diesel engine systems, such as the OM642, the correct operation of the water pump also affects:

• turbocharger operating stability,
• interior heating system efficiency,
• overall engine running smoothness across a wide range of loads.

For a more complete understanding of the pump's interaction with other fuel system and ancillary components, refer to the guide: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair, which discusses the dependencies between key components in modern diesel units.

Selection and Other Mercedes Water Pumps

When selecting a water pump for a Mercedes with an OM642 engine, it is recommended to verify compatibility using the OEM number or the vehicle's VIN to ensure that the design, mounting points, and spigots match the specific engine and body version. This is particularly important for models with different ancillary variants and cooling system configurations.

If you are also looking for other water pumps dedicated to this brand, check out our category Mercedes Water Pumps, where you will find a wide selection of original solutions for various models and generations.