Mercedes-Benz W164 W221 OM642 Diesel Right O/S Exhaust Manifold A6421400861

The Mercedes W164 W221 OM642 Right Exhaust Manifold is a component from the exhaust manifolds category, designed for Mercedes diesel engines with the OM642 unit. This used, original right-side exhaust manifold ensures proper exhaust gas evacuation and stable operation of the exhaust system in premium vehicles.

Specifications and technical data

• SKU: A6421400861
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6421400861
• Substitutable numbers: A6421400861, A 642 140 08 61
• Location on the vehicle: Right
• Fuel type: Diesel
• Category: Manifolds & Headers

Application and Compatibility

The presented right exhaust manifold is dedicated to the OM642 engine used in Mercedes W164 and W221 models with a Diesel engine. Its placement on the right side of the engine allows for maintaining the original exhaust system geometry, which translates to correct exhaust gas evacuation, even load distribution on the turbocharger, and stable engine operating parameters.

By preserving the original design, the manifold integrates seamlessly with factory-fitted components such as the turbocharger, exhaust pipes, and further sections of the exhaust system, without the need for modifications or adaptations.

Technical Characteristics of the Exhaust Manifold

In an OM642 diesel engine, the exhaust manifold is responsible for collecting exhaust gases from individual cylinders and directing them to the rest of the system. The proper design of the channels and their fit to the engine head minimizes flow losses, supports correct turbocharging, and helps maintain stable system pressure.

Key functional features of this component include:

• factory fit to the right side of the OM642 engine head,
• ensuring proper sealing when used with appropriate gaskets,
• resistance to the high exhaust gas temperatures typical of diesel engines,
• direct bolt-on replacement for a worn or damaged manifold.

Application in OM642 Diesel Engines

OM642 diesel engines used in Mercedes W164 and W221 are subjected to high thermal loads, making a correctly chosen exhaust manifold crucial for the durability of the entire system. Replacing a worn component with an original, used manifold restores proper exhaust flow, reduces the risk of leaks, and lessens the load on the turbocharger.

By using an original Mercedes exhaust manifold, you minimize the risk of issues related to fitment, thermal stress, and leaks, which are common with non-factory parts featuring imprecise geometry.

Why Choose a Used Mercedes Exhaust Manifold

A used OEM part offers a sensible compromise between cost and quality. For diesel engine exhaust manifolds, maintaining original design parameters is particularly important, making the choice of a factory component beneficial for both workshops and individual users.

The main advantages of this solution include:

• factory exhaust channel geometry,
• precise fitment to the right side of the OM642 unit,
• the ability to restore proper exhaust system function without the cost of purchasing a new part.

More About Mercedes Exhaust Manifolds and Parts

If you are looking for other Mercedes exhaust manifolds, check out our dedicated category: Mercedes exhaust manifolds. There you will find a wide selection of components for various models and engine configurations of this brand.

Want to better understand how manifold selection affects exhaust system performance and vehicle output? Visit our guide: Performance Exhaust Systems: Used Manifolds and Sport Catalytic Converters on the Road, where we discuss the practical aspects of selecting and using used manifolds in cars like Mercedes, BMW, Audi, VW, and Mini.