Mercedes ML W164 OM629 Diesel EGR Valve Pipe Hose Line Tube A6291400357

Mercedes ML W164 OM629 Intake Pipe EGR Flange is a component from the EGR Valves and Parts group, designed for the exhaust gas recirculation system in a diesel engine. It is responsible for a stable connection between the intake manifold and the EGR system, which directly impacts the engine's running smoothness and exhaust emission parameters. A used OEM component of this type allows for a technically correct repair without the need for aftermarket parts with uncertain tolerances.

Specifications and technical data

• SKU: A6291400357
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6291400357
• Substitutable numbers: A6291400357, A 629 140 03 57
• Fuel type: Diesel
• Category: EGR Parts & Valves

Purpose and Role in the EGR System

The intake pipe – EGR flange in the ML W164 model with the OM629 engine operates in close proximity to the intake and exhaust gas recirculation systems. Its function is to ensure a sealed, stable flow of medium between the manifold and the EGR valve, which is crucial for the correct dosing of exhaust gases for re-combustion.

In a Diesel engine, a properly functioning EGR flange limits the risk of leaks, power loss, and the appearance of errors related to an incorrect amount of recirculated exhaust gases. The correct geometry and fit of the OEM component translate to proper cooperation with the factory engine control unit.

Benefits of Using an Original EGR Intake Pipe

Using an original EGR flange in the Mercedes ML W164 with the OM629 engine ensures:

• maintenance of factory flow characteristics in the intake system,
• proper cooperation with the EGR valve and sensors in the intake system,
• reduced risk of leaks and uncontrolled intake of air or exhaust gases,
• stable engine operation across the full load range.

For the user, this means more predictable vehicle behavior, easier diagnostics, and the ability to maintain the exhaust gas recirculation system in a state consistent with the manufacturer's specifications. The original design is particularly important in complex diesel engines like the OM629.

Product Characteristics and Condition

The offered EGR flange comes from a Mercedes vehicle and belongs to the OEM parts group. It is a used part, which in practice means the possibility of an economical repair while maintaining the factory design and fit. This type of component is particularly attractive for advanced diesel engines, where manufacturing precision directly impacts durability and performance parameters.

The EGR intake pipe is designed to operate in demanding thermal and pressure conditions typical for diesel engines. Proper mounting and the use of appropriate seals during installation allow for the restoration of correct sealing in the intake and exhaust gas recirculation system.

Professional Installation and Operation

To fully utilize the potential of this component, installation by an experienced service center is recommended, paying attention to:

• checking the condition of mating surfaces in the manifold and EGR valve,
• selecting appropriate seals and tightening torques,
• checking the intake system for leaks after installation,
• verifying the EGR system operation through computer diagnostics.

This approach minimizes the risk of repeated disassemblies and allows for maintaining stable Diesel engine operating parameters in the long term.

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 hoses, flanges, or additional sections of exhaust gas recirculation pipes, check the available parts in the Mercedes EGR Valves and Parts category.

Knowledge and Advice for Selecting Used Parts

When choosing used components for the intake and EGR system, it is advisable to consider not only the price but also the origin of the part and its compatibility with the specific engine version. It is good practice to familiarize yourself with advice on purchasing used parts to consciously combine savings with operational safety. The article on our blog may be helpful: Used Car Parts for Mini Cooper – A Way to Style and Savings, which discusses general principles for selecting used components and the approach to verifying them before installation.

For those interested in a broader perspective on engine modifications and the impact of intake and EGR system components on engine performance characteristics, we also recommend the material: How to Increase Engine Power: A Practical Guide to Engine Tuning with Used Parts, which organizes knowledge on safe changes in the engine's auxiliary equipment area.