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

BMW E81 E87 LCI 123d Diesel N47S Injection System is a complete set of components from the Injector Nozzles category, designed for the N47S diesel engine in the facelifted BMW 123d model. The use of a dedicated injection system ensures precise fuel delivery, stable engine operation, and proper compatibility with the factory engine control unit.

Specifications and technical data

• SKU: 8577644
• 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
• Tire profile: 65535
• Category: Fuel Injectors

Intended Use and Compatibility

The presented system is designed to work with the Diesel N47S engine used in the BMW 1 Series E81 and E87, specifically the 123d facelift (LCI) version. Using the correct injector set is crucial for maintaining proper combustion parameters, performance, and the overall refinement of the engine, especially in modern, highly turbocharged diesels.

Technical Characteristics of the Injection System

The injection system in this model is responsible for precisely delivering high-pressure fuel directly into the combustion chamber. The Injector Nozzles work in conjunction with the high-pressure pump and the engine control unit, enabling multiple injection phases within a single operating cycle. This translates to improved flexibility, reduced combustion noise, and lower exhaust emissions.

A properly selected injection system helps maintain:

• stable idle speed,
• proper acceleration dynamics,
• even operation of all cylinders,
• optimal fuel consumption under typical operating conditions.

Benefits of Using an Original Injection System

Using a complete system dedicated to a specific BMW engine minimizes the risk of starting problems, excessive smoke, or uneven engine operation. The factory design ensures correct flow and pressure parameters, as well as full compatibility with the stock engine control unit software, without the need for additional fuel map modifications.

This type of injection system is particularly important in diesel engines, where minor deviations in fuel delivery can lead to a loss of power, increased fuel consumption, or accelerated wear of mechanical components. Properly selected injectors help keep the N47S unit in good operational condition.

Condition and Service Application

The offered component is a used part, removed from a vehicle, and sold as a used injection system. This presents a cost-effective solution for repairs where value for money is important. This type of part is suitable for replacing a damaged system or for comprehensive engine servicing when regeneration or replacement of multiple components is necessary.

Before installation, it is recommended to perform standard diagnostics and adapt the injection parameters according to BMW service procedures to ensure proper integration with the existing fuel system and vehicle electronics.

Technical Support and Additional Information

If you are planning a comprehensive repair or upgrade of the fuel supply system in your BMW and require other parts from the same group, such as injectors, fuel rails, or high-pressure pumps, please check the available parts in the BMW Injector Nozzles category.

To better assess the condition of your fuel system and understand the symptoms typical of worn injectors, it is worth reading the service guide: Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails. The article discusses symptoms, potential consequences of neglect, and basic diagnostic methods, making it easier to decide on replacing or regenerating injection system components.