BMW E81 E87 LCI 123d Diesel N47S 204HP Set Injector Fuel Pump Injection System

BMW E81 E87 LCI 123d Diesel N47S Injector Set is a complete, used set of components from the injector nozzles category, designed for the N47S diesel engine in facelifted BMW 1 Series models. The product provides a solid foundation for restoring the proper operation of the diesel fuel system in the 123d version.

Specifications and technical data

• SKU: 8577644-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8577644
• Substitutable numbers: 13518577644, 8577644, 13517801055, 7801055, 13517812053, 7812053, 7801000, 0445010509, 13537809128, 7809128, 13534740787, 4740787, 0445214135, 13537805430, 7805430, 13537800601, 7800601, 7800599
• Fuel type: Diesel
• Category: Fuel Injectors

Set Purpose and Characteristics

The injector system set has been designed to work with the Diesel N47S unit in BMW E81 and E87 LCI models, specifically the 123d version. It includes key components responsible for precise fuel metering, which directly impacts engine running smoothness, performance, and diesel fuel consumption.

The injector nozzles in this set are structurally matched to the specifics of the four-cylinder biturbo engine, ensuring the correct fuel pressure and spray pattern in the combustion chamber.

Benefits of Using the Injector System Set

Replacing the complete injector system set in a BMW 123d with an N47S engine can in many cases:

• reduce rough idling and engine vibrations,
• improve throttle response and flexibility across the entire RPM range,
• stabilize cold and hot start parameters,
• reduce exhaust smoke resulting from improper fuel atomization,
• maintain correct common rail pressure, which contributes to the durability of other auxiliary components.

By maintaining compliance with the original BMW specifications, the set allows for the preservation of the engine's original operating parameters without the need for modifications to the fuel system.

Technical Aspect and Compatibility

The injector system in the N47S engine operates based on a high-pressure common rail system, where the injector nozzles are responsible for precise fuel metering in multiple injection phases. The use of a properly selected set is crucial for:

• injection pressure stability under varying engine loads,
• uniform cylinder filling with the fuel-air mixture,
• reducing knocking and undesirable torsional vibrations of the crankshaft.

The product is designed for diesel-powered units, meaning its characteristics have been adapted to the high operating pressures typical of modern BMW diesel engines.

Condition and Service Application

The injector system set is offered as a used part, making it an attractive cost-effective alternative compared to new components. This type of solution is often chosen for:

• comprehensive repairs of N47S units after fuel system failure,
• restoring factory configuration after unsuccessful modifications,
• servicing fleet vehicles where a reasonable price-to-functionality ratio is important.

Before installation, a standard diagnostic procedure and component verification in a specialized service center are recommended to match the operating parameters to the specific engine instance.

Technical Support and Part Number Selection

The components included in the set have dedicated OEM part numbers and associated replacement numbers, which facilitates their identification and selection for a specific vehicle configuration. If you have any doubts, it may be helpful to consult the guide on verifying components by manufacturer markings – you can find it in the article how to safely buy BMW components online by OEM numbers.

If you want to better understand the typical symptoms of wear in injector components in diesel engines, it is worth reading the guide diesel injector faults – symptoms, consequences, and diagnostics, which discusses practical aspects of operating and servicing injector systems.

Related BMW Injector Nozzles

If you are also looking for other BMW injector nozzles for different models or engine versions, check out the BMW injector nozzles available in our store to select the configuration suitable for your vehicle.