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

BMW E81 E87 LCI 123d Diesel N47S 204HP Injector System Kit is a complete set of components from the injector nozzles category, designed for the N47S 204 HP diesel engine in the facelifted BMW 123d (E81/E87 LCI) model. This solution is for users seeking factory fitment and a proven diesel injection system design.

Specifications and technical data

• SKU: 8577644-3
• 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

Intended Use and Compatibility

The injection system kit has been specifically designed for the BMW 1 Series E81/E87 LCI 123d with the N47S 204 HP engine. This ensures proper matching to the engine's operating parameters, injection pressure characteristics, and fuel delivery control in a modern BMW diesel.

The components included in the kit come from the BMW OE line, which translates to compliance with the manufacturer's factory standards regarding design, materials, and manufacturing tolerances. This allows the system to maintain correct operating pressures, and the engine control unit can operate within the manufacturer's specified correction ranges.

Technical Characteristics of the Injection System

The presented kit includes components from the injector nozzles category, working with a high-pressure diesel fuel supply system. The design is adapted for precise fuel metering in multiple injection phases, which is crucial for the N47S engine's running smoothness, dynamics, and exhaust emission levels.

Key functional features include:

• Precise Fuel Atomization – proper formation of the diesel spray in the combustion chamber, promoting uniform mixture ignition.
• Adaptation to High Operating Pressures – system components are designed for the loads typical of modern common rail diesels.
• Stable Interaction with Engine Electronics – maintaining parameters required by the control unit, facilitating adaptation and diagnostics.
• Proper Fitment to N47S Cylinder Head Geometry – correct seating of injector nozzles in the cylinder head and combustion chamber.

Benefits of Using the Kit in the BMW 123d

A properly selected injection system kit in a diesel engine directly impacts driving performance and engine longevity. For the BMW 123d with the N47S engine, you can expect, among other things:

• Improved Idle Stability – reduced vibrations and uneven running resulting from fuel delivery discrepancies.
• More Responsive Throttle Response – faster torque build-up due to correctly tuned injection.
• Potential Fuel Consumption Reduction – more efficient combustion while maintaining stock engine parameters.
• Reduced Exhaust Smoke – proper diesel atomization limits soot formation.

Using injector nozzles specifically designed for this BMW model allows for the preservation of the N47S engine's factory operating characteristics, which is particularly important when operating a higher-performance car like the 123d.

Condition, Origin, and Installation Aspects

The offered injection system kit is used, providing an attractive cost alternative to new OEM components. For many BMW 123d owners, this represents a sensible compromise between price and maintaining the original manufacturer's specifications.

During installation, it is recommended to:

• Professional Pre-Installation Diagnostics – verify operating parameters on a test bench or using an appropriate tester.
• Replace Seals and Washers – to ensure leak-free connections in the cylinder head and on high-pressure lines.
• Adapt Injectors in the Engine Control Unit – following the service procedure for the N47S unit.

By adhering to BMW OE standards, the kit is prepared for integration with the factory engine hardware, simplifying installation in a specialized workshop.

Diagnostics and Operation of a Diesel Injection System

The injection system in a diesel engine is particularly sensitive to fuel quality and regular servicing. Symptoms such as starting difficulties, power loss, increased smoke, or uneven running may indicate wear of injector nozzles or other kit components. It is advisable to consult practical tips for problem identification – you can find them in the article diesel injector faults – symptoms, consequences, and diagnostics, which helps assess the system's condition before deciding on replacement.

Related Products from the BMW Injector Nozzles Category

If you are also looking for other components from the BMW injector nozzles category, suitable for various BMW models, check out our offer in the BMW injector nozzles section, where you will find a wide selection of injection system components for diesel engines.