Mercedes W164 W204 Exhaust Manifold Right O/S OM642 Diesel A6421420002

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes W164 W204 Exhaust Manifold Right O/S OM642 Diesel is a factory-made exhaust system component designed for diesel engines, ensuring proper exhaust gas discharge from the right side of the engine. The original manifold design guarantees proper fitment to the cylinder head and maintains the factory performance parameters of the power unit. This used OEM part is a sensible choice for repairs when you are looking for a proven technical solution without excessive costs.

Specifications and technical data

• SKU: A6421420002
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421420002
• Substitutable numbers: A6421420002, A 642 142 00 02
• Location on the vehicle: Right
• Fuel type: Diesel
• Category: Exhaust Pipes & Tips

Purpose and function of the exhaust manifold

The exhaust manifold in Mercedes W204 diesel models is responsible for collecting exhaust gases from the cylinders and distributing them evenly to the rest of the system. The right side of the engine requires a component with precisely selected channel geometry to maintain proper exhaust pressure, stable turbocharger operation, and the correct temperature in the engine bay. Using an original manifold allows you to maintain factory flow parameters and reduce the risk of leaks.

Benefits of using an original Mercedes manifold

Choosing an exhaust manifold from original Mercedes production primarily ensures reliable fitment to the power unit and compatibility with engine accessories. The original part was designed for a specific exhaust system, ensuring that the correct flow characteristics are maintained and the risk of thermal and mechanical stress is minimized.

For diesel engines, it is particularly important to maintain tightness and stable pressure in the exhaust system. A used OEM manifold allows you to:

• minimize the risk of cracks resulting from the incorrect geometry of aftermarket replacements,
• maintain proper operating conditions for the turbine and exhaust gas treatment system,
• preserve the engine's refinement and predictable response to load.

Installation and operational characteristics

The exhaust manifold on the right side of the Mercedes W204 engine is a component that operates at high temperatures and under significant load, which is why it is crucial to use a part with the correct rigidity and heat resistance. The original design ensures stable mounting to the cylinder head and correct positioning relative to the subsequent sections of the exhaust system.

When replacing the manifold, it is worth paying attention to:

• the condition of the mating surface to the cylinder head and the seals,
• proper tightening of the bolts in accordance with the service procedure,
• checking for leaks after the first engine warm-up cycles.

A used component allows for an economical repair while maintaining factory build quality and exhaust system performance parameters.

Application in diesel engines

Diesel engines generate high exhaust pressures and temperatures, so the exhaust manifold must be characterized by appropriate durability and dimensional stability. In the case of diesel units in the Mercedes W204, a properly selected manifold influences:

• boost efficiency and acceleration dynamics,
• the operation of the exhaust gas recirculation system and treatment systems,
• reduction of noise and vibrations transmitted to the body.

Using an original component allows you to maintain the parameters specified by the manufacturer, which translates into stable vehicle operation in the long term.

Product condition and choosing used OEM parts

The offered exhaust manifold is a used component, which allows for a significant reduction in repair costs compared to a new part, while maintaining a design consistent with the factory specifications. This solution is particularly beneficial for comprehensive work within the exhaust system, where several components are replaced simultaneously.

If you want to better understand why original used parts are a safe and cost-effective choice, it is worth reading our expert article: Quality assurance and OEM safety – why used original car parts are the best choice for your vehicle?.

Expanding the exhaust system in the Mercedes W204

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 exhaust pipe sections, connectors, or end sections of the system, check out the available parts in the Mercedes exhaust pipes and tips category.