BMW E81 E87 LCI E90 E91 120d 320d 520d Diesel N47 Injector 7797877

BMW E81 E87 LCI E90 E91 Diesel N47 Injector Fuel Injector 7797877 is an original component of the BMW diesel engine fuel system, designed for precise fuel delivery in N47 units. This used injector nozzle allows for an economical yet technically correct repair of the injection system in popular 1 and 3 Series models.

Specifications and technical data

• SKU: 7797877
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7797877
• Substitutable numbers: 13537797877, 7797877
• Fuel type: Diesel
• Category: Fuel Injectors

Application in BMW N47 Engines

The presented injector is a component from the injector nozzles category, designed to work with BMW N47 diesel engines installed in E81, E87 LCI, E90, and E91 models. It is responsible for the accurate atomization of diesel fuel in the combustion chamber, which directly impacts the engine's running smoothness, dynamics, and fuel consumption.

Thanks to its design conforming to the manufacturer's standards, the injector maintains the correct operating parameters of the common rail system, enabling stable injection pressure and repeatable fuel doses across the entire engine load range.

Technical and Functional Characteristics

As a component of the Diesel fuel system, the injector works with the high-pressure pump and common rail, performing multi-phase fuel injection (pre-injection and main injection) according to the engine control unit's maps. A correctly selected and functional injector allows for:

• maintaining smooth engine operation at idle and under load, without excessive vibrations or misfires,
• reducing smoke and improving exhaust gas composition, which contributes to the longevity of the particulate filter and other exhaust system components,
• stable performance across the entire RPM range, while maintaining factory torque parameters,
• more predictable fuel consumption, which helps control vehicle operating costs.

Its original BMW origin ensures proper fit in the cylinder head port, correct sealing, and compatibility with the engine's factory equipment.

Injector Condition, Selection, and Installation

The offered item is a used part, allowing for a cost-effective overhaul of the injection system while retaining a component that matches the factory specifications. Before installation, it is recommended to:

• verify operating parameters on a test bench at a specialized diesel service center,
• check the fuel system for leaks and the condition of the return lines,
• use new sealing washers and properly prepare the cylinder head port (cleaning, surface inspection),
• adapt the injector in the engine control unit, if required by the specific N47 variant.

Proper installation and diagnostics allow for restoring correct injection system operation without the need to invest in a new component.

Benefits of Using an Original BMW Injector Nozzle

Choosing an original injector for an N47 engine translates into a range of practical operational benefits:

• compatibility with factory control unit maps – no need for software modifications or compromises in operating parameters,
• reliable mechanical fit – correct length, spray angle, and injector tip geometry,
• easier diagnostics – BMW-specialized service centers have procedures and reference data for this type of injector,
• consistency with other system components – compatibility with the high-pressure pump, common rail, and N47 engine equipment.

This makes the injector a sensible choice for repairs where maintaining stable diesel engine operation and minimizing the risk of additional faults due to improperly selected aftermarket parts is crucial.

Injection System Diagnostics and Prevention

When replacing or repairing injectors, it is worth paying attention to typical signs of wear, such as cold start difficulties, increased smoke, power loss, or uneven idling. A detailed discussion of symptoms and potential consequences of neglect can be found in the article: Diesel Injector Failures – How to Recognize Them and What Neglecting Them Entails. The knowledge from this material facilitates the decision to replace a single injector or a complete set.

If you are looking for other BMW injector nozzles for your car, check out our dedicated offer: BMW injector nozzles, where you will find a wide selection of injection system components tailored to various models of this brand.