Mercedes W204 W212 W221 Cylinder Head Bank 4-6 Right O/S OM642 V6 A6420100621

Mercedes W204 W212 W221 Cylinder Head Bank 4-6 Right O/S OM642 V6 is an original, used cylinder head from the Cylinder Heads category, designed for the right side of the engine unit in Mercedes vehicles. The component has been engineered for precise compatibility with the V6 engine, ensuring stable operation of the valve train and proper sealing of the combustion chamber. This is a solution for users looking for a technically matched component for a petrol-powered engine.

Specifications and technical data

• SKU: A6420100621
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420100621
• Substitutable numbers: A6420100621, A 642 010 06 21, A6420108820, A 642 010 88 20, R6420163601, R 642 016 36 01, A6420506101, A 642 050 61 01, A6420504601, A 642 050 46 01
• Location on the vehicle: Right
• Fuel type: Petrol
• Part type: Cylinder Head
• Category: Cylinder Heads

Purpose and technical fitment

The presented cylinder head is dedicated to the OM642 unit in a V6 configuration, installed in mid-size and luxury Mercedes models. Its placement on the right side of the engine allows for a direct replacement of the existing component without the need for block structure modifications. By maintaining the factory geometry of the intake and exhaust ports, the cylinder head supports proper cylinder filling and exhaust gas discharge, which translates into stable performance of the petrol engine.

Construction and function of the cylinder head

The cylinder head in a V6 engine is responsible for valve guidance, combustion chamber tightness, and proper cooling and lubrication of the upper part of the unit. This design utilizes an oil and cooling channel layout tailored to the specifics of the OM642 engine, which enables uniform heat dissipation from the area of the valves and spark plugs. A correctly selected cylinder head reduces the risk of overheating, leaks, and compression drops in cylinders 4–6.

Application in a V6 petrol engine

A V6 petrol engine requires a precisely manufactured cylinder head that ensures proper air-fuel mixture guidance and efficient exhaust gas discharge. Using this cylinder head on the right side of the unit:

• supports smooth operation of cylinders 4–6 across the entire RPM range,
• allows for the maintenance of factory power and torque parameters,
• facilitates the maintenance of correct compression values in each of the serviced cylinders.

Thanks to the preservation of the original design specifications, the cylinder head works well with factory engine equipment, which is significant when servicing Mercedes vehicles with rear-wheel or all-wheel drive.

Benefits of using an original used cylinder head

Choosing a used cylinder head with an intact OEM structure allows for reduced repair costs while maintaining compliance with the manufacturer's factory standards. This type of component is particularly useful for:

• overhauling the upper part of the engine after mechanical damage or overheating,
• restoring the efficiency of the power unit in vehicles used intensively,
• servicing AWD vehicles, where stable engine operation is crucial for the entire drivetrain.

The original cylinder head from the Cylinder Heads category helps maintain compatibility with factory equipment, which facilitates installation and subsequent maintenance.

Support for selection and drivetrain expansion

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes with rear-wheel or all-wheel drive, it is worth considering the impact of the cylinder head's condition on the operation of the entire drivetrain. For drivers interested in a broader perspective on the design and service of drivetrains in premium vehicles, an article describing various AWD solutions will be helpful – comparison of xDrive, 4Matic, quattro and 4Motion drives, which discusses, among other things, when it is worth reaching for used 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 additional cylinder heads, covers, or mounting elements, check the available parts in the Mercedes Cylinder Heads category.