Mercedes W204 W212 W221 Cylinder Head Bank 1-3 Left N/S OM642 V6 R6420163901

Mercedes W204 W212 W221 Cylinder Head Bank 1-3 Left N/S OM642 V6 is an original, used cylinder head from the Cylinder Heads category, designed for installation on the left side of the engine unit in Mercedes vehicles. This component is engineered for V6 engines, ensuring proper operation of cylinders 1 through 3 and stable combustion conditions.

Specifications and technical data

• SKU: A6420106720
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420106720
• Substitutable numbers: A6420106720, A 642 010 67 20, R6420163901, R 642 016 39 01
• Location on the vehicle: Left
• Fuel type: Petrol
• Part type: Cylinder Head
• Category: Cylinder Heads

Purpose and compatibility

The presented cylinder head is dedicated to installation on the left side of a V6 engine, covering the first, second, and third cylinders. The design, adapted for these engine units, allows for maintaining the correct combustion chamber geometry, proper intake and exhaust port routing, and stable valve operation under typical operating conditions for mid-size and luxury Mercedes cars.

Its original Mercedes origin ensures that factory manufacturing tolerances are maintained, which translates into a proper fit with the engine block, manifolds, and accessories. As a result, this cylinder head is a suitable choice for both routine repairs and comprehensive engine overhauls.

Construction and technical properties

The cylinder head is designed to operate in a V6 engine, where precise routing of oil and cooling channels and the correct placement of spark plug seats are crucial. The valve train and guides are adapted to the loads typical of these engines, which promotes smooth cylinder operation and a stable combustion process.

The placement on the left side of the engine requires maintaining a specific geometry of the mating surface to the block and the correct arrangement of mounting points. This ensures that installation is predictable, and the connection with other powertrain components remains sealed and resistant to thermal stress.

Use in repairs and upgrades

A used cylinder head from this series is ideal for situations where the existing component has suffered mechanical damage, overheating, or deformation. Replacing it with an original cylinder head allows for restoring proper cylinder compression, reducing oil consumption, and improving engine refinement without the need to resort to less predictable aftermarket replacements.

In workshop practice, such a component is often used during V6 engine overhauls, where maintaining structural compliance with the factory design is key. A properly selected cylinder head also facilitates subsequent diagnostics, as engine operating parameters remain close to the values specified by the manufacturer.

Benefits of using an original cylinder head

Using an original cylinder head from the Cylinder Heads category in a Mercedes vehicle helps maintain the integrity of the entire powertrain, which is important for both durability and the vehicle's future value. Maintaining factory specifications promotes stable engine operation and facilitates future servicing.

If you want to better understand how the selection of original used parts affects a car's resale value, it is worth reading our guide: Original used parts vs. car resale value – how not to lose money?.

Expanding the scope of engine repairs

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 additional cylinder heads, covers, or mounting elements, check out the available parts in the Mercedes Cylinder Heads category.