BMW E81 E87 E90 E91 E92 120d 320d Diesel N47 Set Fuel Injector Injection System

BMW E81 E87 E90 E91 E92 120d 320d Diesel N47 Injection System Kit is a complete, used set of components from the injector nozzles category, designed for BMW 1 and 3 Series diesel engines with the N47 unit. This solution is for users who want to restore the proper operation of the diesel fuel system while maintaining the engine's factory performance characteristics.

Specifications and technical data

• SKU: 7797877-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797877
• Substitutable numbers: 7797877, 13537797877, 7797874, 0445010506, 0 445 010 506, 7800667, 13537800667, 8511812, 13538511812, 7809128, 13537809128, 7800601, 13537800601, 4740787, 13534740787, 7800669, 13537800669, 7800666, 13537800666, 8511810, 13538511810, 4734842, 13534734842
• Fuel type: Diesel
• Category: Fuel Injectors

Purpose and Compatibility

The injection system kit has been designed for BMW E81, E87, E90, E91, and E92 models in the 120d and 320d versions with the N47 engine. It meets the requirements of diesel units where precise fuel metering and stable common rail pressure are crucial.

By using components from the injector nozzles category dedicated to a specific engine family, it is possible to maintain proper running smoothness, correct fuel atomization, and the appropriate torque curve across the entire RPM range.

Technical Characteristics of the Injection System

In BMW N47 diesel engines, the quality and condition of the injection system are of paramount importance. The components used in this kit work with diesel fuel, ensuring:

• precise fuel metering depending on engine load and speed,
• stable injection pressure necessary for proper mixture formation,
• correct fuel spray pattern in the combustion chamber, which affects combustion efficiency and engine running smoothness,
• maintenance of factory parameters in terms of dynamics, fuel consumption, and emissions (provided the engine ancillaries are functional).

The presence of OEM part numbers and interchangeable numbers in the technical specification facilitates verification of the kit's compatibility with a specific vehicle configuration and allows for selecting a component that precisely matches the factory equipment.

Practical Application and Benefits of Installation

Installing the injection system kit in a BMW 120d or 320d with an N47 engine is particularly important in cases of symptoms such as uneven idling, power loss, increased fuel consumption, or starting problems. Replacing worn injection components with a functional kit allows for:

• stabilizing engine operation across the full RPM range,
• reducing smoke during acceleration and startup,
• mitigating the risk of further damage to ancillary components (e.g., particulate filter, turbocharger),
• restoring predictable throttle response and improving driving comfort.

Due to the specific nature of BMW diesel engines, a properly functioning injection system directly impacts engine durability and long-term operating costs.

Condition, Origin, and Verification of Parts

The injection system kit is a used component, sourced from a dismantled BMW vehicle. Such components are often chosen by users seeking a reasonable compromise between repair cost and maintaining original technical specifications.

Before installation, professional diagnostics and, if necessary, adaptation of the injection system using appropriate service software are recommended. This allows for the full utilization of the kit's potential and reduces the risk of incorrect engine operation after replacement.

Technical Support and Additional Materials

If you want to better understand the symptoms of wear in diesel engine injection components, read the article: Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails. You will find practical information on diagnostics, typical symptoms, and the consequences of driving with a faulty injection system.

When planning an upgrade or comparison of BMW engine units, the comparative material may also be helpful: BMW N47 vs M57 / M57N / M57N2 – A Ranking of Legendary Diesels, which discusses performance, reliability, and the availability of aftermarket parts.

If you are looking for other components from the injector nozzles category dedicated to this brand, check the BMW injector nozzles available in our store to select components tailored to your specific model and engine version.