Mercedes W212 OM642 Diesel Engine Water Pump Coolant Water Unit A6422002101

The Mercedes W212 OM642 Water Pump is an original cooling system component designed for OM642 diesel engines in Mercedes E-Class W212 models. This used pump from the Water Pumps group ensures a factory fit, proper coolant circulation, and stable operating conditions for the Diesel engine, contributing to safe vehicle operation.

Specifications and technical data

• SKU: A6422002101
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6422002101
• Substitutable numbers: A6422002101, A 642 200 21 01, KD
• Fuel type: Diesel
• Category: Water Pumps

Purpose and Function in the Cooling System

The Water pump for Mercedes W212 with OM642 engine is responsible for forcing the circulation of coolant within the engine block, cylinder heads, and radiator. A properly functioning component maintains the stable operating temperature of the diesel engine, reduces the risk of overheating, and supports uniform heat dissipation during both highway and city driving.

Being dedicated to a specific type of Diesel engine allows for maintaining correct flow parameters, pressure, and operating characteristics in line with the manufacturer's specifications. This ensures the cooling system works correctly with the thermostat, temperature sensors, and engine control unit.

Construction and Fit for OM642 Engine

The pump is designed as a component to be installed in its factory location on the OM642 unit, featuring a precisely shaped housing and connection ports. This means:

• secure connection with the cooling system hoses,
• maintenance of the correct pump drive geometry,
• compatibility with the engine accessories intended for the W212.

Its original Mercedes origin promotes sealing, proper gasket placement, and correct interaction with other cooling system components.

Operating Characteristics in a Diesel Engine

Diesel engines generate significant thermal loads, especially during prolonged driving with high torque. The water pump designed for the W212 Diesel unit is selected to:

• maintain a stable operating temperature across a wide range of loads,
• support uniform cooling of cylinders and heads,
• ensure adequate fluid flow at low and high engine speeds.

This keeps the cooling system efficient in both city traffic and higher-speed driving, which is crucial for the longevity of the OM642 engine.

Condition, Verification, and Service Application

This component is offered as a used part, providing a cost-effective solution while maintaining original manufacturer specifications. This type of pump is suitable for routine repairs, replacement of worn components, or restoring the cooling system's efficiency in a Mercedes W212 with an OM642 engine.

The presence of the OEM part number and available interchange numbers facilitates precise identification and selection for specific vehicle configurations. If in doubt, it is advisable to compare the markings with service documentation or the VIN to ensure full assembly compatibility.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and require other parts from the same group, such as additional pumps, housings, or mounting elements, check the available parts in the Mercedes Water Pumps category.

Operation, Diagnostics, and Selection by Numbers

When replacing a water pump in a diesel engine, proper cooling system bleeding, leak checks, and operation verification at various temperatures are crucial. Correct selection by OEM number or reference numbers minimizes the risk of installation problems and leaks.

To better understand the relationships between the cooling system and the diesel engine's power supply, as well as the correct selection of components by catalog numbers, it is recommended to consult a guide on fuel systems, diagnostics, and repair – a detailed discussion can be found in the article “Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair”.