BMW E87 LCI E90 Engine EGR Exhaust Cooler 320d Diesel N47 7797371

BMW E87 LCI E90 Engine EGR Exhaust Cooler is a factory-original exhaust gas recirculation component designed for BMW N47 diesel engines. It is responsible for efficiently cooling the exhaust gases directed back to the intake manifold, which promotes stable engine operation and reduces emissions. Thanks to its OEM design, the cooler ensures a proper fit for the exhaust and intake system without the need for modifications.

Specifications and technical data

• SKU: 7797371
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797371
• Substitutable numbers: 11717797371, 7797371
• Fuel type: Diesel
• Category: Other Exhaust & Emission Parts

Purpose and function in the EGR system

The EGR exhaust cooler in BMW E87 LCI and E90 models with the N47 engine operates within the diesel engine's exhaust circuit, lowering the temperature of the gases before they are reintroduced into the combustion chamber. Cooled exhaust gases help reduce the formation of nitrogen oxides, improve engine refinement, and help maintain emission parameters at levels consistent with the manufacturer's specifications.

A properly selected EGR cooler is important for:

• stable operating temperature of the diesel engine,
• correct operation of the EGR valve and engine control,
• maintaining appropriate emission values in diesel engines.

Construction and fitment for BMW E87 LCI / E90 N47

The offered EGR exhaust cooler is a component designed specifically for the architecture of the N47 unit in compact and mid-size BMW models. The geometry of the ports, mounting points, and exhaust channel layout are adapted to the factory arrangement of accessories in the engine bay, which facilitates installation and subsequent maintenance.

Thanks to the OEM design, the following are maintained:

• correct exhaust gas routing in the recirculation system,
• compatibility with factory mounts and brackets in the E87 LCI and E90 body,
• cooperation with the original EGR valve and engine installation.

Condition, application, and benefits of replacement

The item comes from dismantling and is offered as a used EGR exhaust cooler, which allows for an economical repair of the exhaust gas recirculation system while maintaining the manufacturer's original specifications. This solution is particularly beneficial in cases of mechanical damage or leaks in the existing cooler, which can lead to power loss, ECU errors, or increased exhaust smoke.

Replacing the EGR cooler is recommended, among other things, when:

• there are exhaust or coolant leaks in the vicinity of the EGR module,
• errors related to exhaust gas recirculation and system temperature appear,
• corrosion or damage to the cooling channels is detected.

Diesel N47 engine – specifics of working with an EGR cooler

BMW N47 diesel engines operate across a wide range of loads and temperatures, which is why an efficient EGR system with a high-performance exhaust cooler is essential for their durability. Proper cooling of exhaust gases helps reduce the thermal load on combustion chamber components and decreases the risk of carbon deposit buildup in the intake manifold. A properly functioning EGR cooler also supports the stability of operating parameters at low and medium loads, which translates into predictable throttle response and smooth engine operation.

System expansion and related technical solutions

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as additional modules, engine accessories, or exhaust system parts, check out the available parts in the Other BMW category.

For larger modernization projects or vehicle retrofitting, it is worth considering the use of original parts from dismantling, especially in the case of premium brands. Practical tips on this approach can be found in the article Retrofitting in VAG and BMW group cars: How to cheaply upgrade your car using used parts from higher versions?, which describes how to consciously select used components and integrate them with the existing vehicle configuration.

Technical support and additional knowledge

For drivers interested in comparing technical solutions used in different brands and engine versions, comparative material regarding sports power units and their accessories may be helpful. In this context, it is worth checking out the entry Audi RS vs other models – what is hidden under the hood and chassis?, which discusses the differences in the construction of engines, braking systems, and chassis, showing how manufacturers use advanced components to improve performance and durability.