Mercedes C E W203 W211 OM646 Diesel Engine Cylinder Head Cover A6460101630

Mercedes C E W203 W211 OM646 Diesel Engine Cylinder Head Cover is an original component from the Tappet and valve covers group, designed for OM646 diesel units. It provides a tight seal for the upper part of the engine, stabilizes the timing system operation, and protects tappet and valve components from contaminants, which translates into smoother and more predictable engine performance.

Specifications and technical data

• SKU: A6460101630
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6460101630
• Substitutable numbers: A6460101630, A 646 010 16 30, BG
• Fuel type: Diesel
• Category: Rocker & Valve Covers

Purpose and function in the OM646 engine

The cylinder head cover in a diesel engine plays a crucial role in sealing the upper part of the power unit. In the case of OM646 diesel engines, it is responsible for:

• protecting tappets and valves from external dust, moisture, and oil,
• maintaining stable operating conditions for the timing mechanism,
• limiting oil leaks from the upper part of the engine,
• reducing noise generated by valve operation.

Thanks to its precise fit to the specific design of the diesel unit, the correct geometry of the mounts and the proper routing of ventilation channels are maintained, which is essential for the smooth operation of the diesel engine.

Compatibility with Mercedes C W203 and E W211

Mercedes C E W203 W211 OM646 Diesel Engine Cylinder Head Cover has been designed specifically for OM646 units. This means compatibility with the factory mounting system, the intended space under the hood, and the original accessory architecture.

Selecting the component by OEM part number and interchangeable numbers allows for verifying compatibility with a specific engine version and vehicle year, which minimizes the risk of installation problems. In practice, this translates into a plug-in installation in place of the old cover, without the need for modifications.

Performance characteristics and advantages of use

The original cylinder head cover from the Tappet and valve covers group ensures the parameters specified by the vehicle manufacturer. In daily operation, this translates into:

• stable sealing of the upper part of the diesel engine,
• better protection of the valve mechanism against contaminants,
• maintaining proper oil vapor circulation within the cylinder head,
• a neater and more organized engine bay environment.

The item comes from the segment of used original parts, which allows combining an attractive price with the preservation of factory geometry and compatibility. This is a particularly attractive solution when servicing older C-Class W203 and E-Class W211 models with diesel engines.

Professional selection by numbers and parameters

To correctly select a cylinder head cover for a specific car, it is worth using the OEM part number, interchangeable numbers, and fuel type designation. Such an approach facilitates the verification of compatibility with a given OM646 engine version and limits the risk of purchasing an incompatible part. If necessary, you can additionally compare the shape and arrangement of mounting points with the currently installed cover.

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 covers, seals, or mounting elements, check the available parts in the Mercedes Tappet and valve covers category.

Expert support and knowledge about used parts

When selecting used components for the powertrain – both mechanical and electronic – it is worth relying on proven identification procedures based on numbers and parameters. An extended discussion of the principles of selection by VIN/OEM, compatibility issues, and practical examples can be found in the Global Parts guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.