Mercedes R171 M272.942 Left Engine Gas Exhaust Manifold A2721402509

The Mercedes R171 M272.942 Left Exhaust Manifold is a factory exhaust system component designed for diesel engines, ensuring stable exhaust gas evacuation from the left side of the engine. The original manifold design guarantees proper fitment to the cylinder head and correct interaction with other system components. This makes it a solid foundation for repairing or restoring the full functionality of the exhaust system in Mercedes vehicles.

Specifications and technical data

• SKU: A2721402509
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2721402509
• Substitutable numbers: A2721402509, A 272 140 25 09
• Location on the vehicle: Left
• Fuel type: Diesel
• Category: Manifolds & Headers

Technical Characteristics and Application

The presented manifold belongs to the Exhaust Manifolds category and is designed for installation on the left side of the engine unit. Its exhaust channel geometry is adapted for diesel engines, allowing for uniform exhaust gas evacuation from the cylinders and minimizing unfavorable flow turbulence.

The exhaust system in a diesel engine operates under significant thermal and pressure loads, therefore, proper manifold fitment is crucial for connection sealing, stable turbocharger operation (if present in the specific configuration), and correct interaction with downstream exhaust components.

Benefits of Using an Original Exhaust Manifold

Using an original exhaust manifold in a Mercedes translates into a number of practical operational benefits:

• maintaining factory exhaust gas flow characteristics in the diesel engine,
• correct fitment to the cylinder head and other system components,
• reduced risk of connection leaks,
• stable engine unit operation across the full load range.

This allows the manifold to be used for both standard repairs and more extensive exhaust system upgrades where maintaining factory-like parameters is important.

Condition, Installation, and Service Application

The component comes from a group of used parts, allowing for economical repair while maintaining original technical specifications. The manifold is designed for direct installation in place of the factory equivalent, using appropriate gaskets and mounting hardware selected for the specific vehicle model.

When replacing the exhaust manifold, it is recommended to check the flatness of the mating surface to the cylinder head, the condition of the threads, and the fastening elements. Properly executed installation minimizes the risk of exhaust leaks, unwanted noises, and performance drops of the engine unit.

Integration with the Exhaust System and Further Expansion

The exhaust manifold operates in close proximity to other system components such as connecting pipes, catalytic converters, or mufflers. In case of exhaust system expansion or modification – for example, to improve flow or change engine operating characteristics – retaining the original left-side manifold allows for maintaining the correct exhaust outlet geometry.

If you want to better understand the impact of the manifold on exhaust system performance and durability, and are considering using used parts in service or tuning projects, it is worth reading our guide: Performance Exhaust Systems and Used Manifolds in Practice.

Mercedes Exhaust Manifolds – System Expansion

If you are planning a comprehensive engine area repair or upgrade for your Mercedes and need other components from the same group, such as additional manifolds, connecting sections, or mounting elements, check the available parts in the Mercedes Exhaust Manifolds category.