Mercedes W169 W245 OM640 CDI Cylinder Head Valve Cover A6400100667

Mercedes W169 W245 OM640 Valve Cover is an original part from the Rocker and Valve Covers group, designed for OM640 engines in W169 A-Class and W245 B-Class models. The carefully designed cover ensures a tight seal for the upper part of the engine, stabilizes the timing system's operation, and helps maintain the engine bay in proper service order.

Specifications and technical data

• SKU: A6400100667
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400100667
• Substitutable numbers: A6400100667, A 640 010 06 67, KD
• Category: Rocker & Valve Covers

Function and Role of the Valve Cover

The valve cover in the OM640 unit is responsible for isolating the valve mechanism from external contaminants and controlling oil circulation in the upper part of the cylinder head. A correctly selected part:

• limits oil leaks from the cylinder head area,
• stabilizes the operation of the rocker and valve system,
• protects sensitive components from dust and moisture,
• facilitates cleanliness in the engine bay.

This allows the OM640 engine to maintain proper operating conditions, and servicing becomes more predictable and organized.

Compatibility with OM640 Engine in Mercedes W169 and W245

The presented valve cover for Mercedes has been specifically designed for the OM640 engine construction used in W169 and W245 models. This means maintaining factory geometry, appropriate mounting point placement, and compatibility with standard seals and engine accessories.

Selecting the part according to the manufacturer's designations helps avoid problems with leaks, material stress, or interference with other components in the engine bay. This is particularly important when operating under conditions of elevated temperature and variable crankcase pressure.

Characteristics of a Used Part

The cover is from the used parts group, which in practice means it is an original component from disassembly, retaining the mounting parameters specified by the manufacturer. Such parts are often chosen for:

• routine repairs after oil leaks from the upper part of the engine,
• restoring the sealing of the valve system after mechanical damage to the cover structure,
• servicing OM640 units where cracks or deformation of the original part have occurred.

Using an original cover from the aftermarket allows for proper fitment with the cylinder head and accessories, while also reducing repair costs compared to purchasing a new component.

Benefits of Using an Original Valve Cover

Choosing a factory valve cover for your Mercedes translates into a number of practical advantages:

• Precise Fitment – maintaining original geometry and mounting points facilitates installation and minimizes the risk of leaks.
• Stable Valve System Operation – appropriate structural rigidity supports the correct operating conditions for rockers and valves.
• Better Protection for Mechanisms – an effective barrier against contaminants from the engine bay extends the lifespan of moving parts.
• Compatibility with Other Components – the original design ensures compatibility with standard seals, hoses, and accessories.

Mercedes Rocker and Valve Covers – Expansion and Service

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other parts from the same group, such as additional covers, seals, or mounting elements, check the available parts in the Mercedes Rocker and Valve Covers category.

Technical Support and Service Knowledge

When working on the OM640 engine unit, it is also worth paying attention to components cooperating with the combustion and exhaust gas system. To deepen your knowledge about one of the key systems, it is worth reading the article EGR: What it is and why consider used EGR valves, which discusses the principles of exhaust gas recirculation and practical aspects of selecting aftermarket parts.