Part Number: X52407500063 (This is the genuine MTU/Rolls-Royce Solutions part number).
Application: Specifically designed for the MTU Series 4000 diesel engines. This includes popular models like the 12V 4000, 16V 4000, and 20V 4000 used in marine propulsion, power generation, and heavy-duty industrial applications.
Common Name: Unit Injector (UI). The MTU 4000 series uses a high-pressure, electronically controlled unit injector system where the pump and injector are a single unit.
High-Precision Component: It is responsible for metering, pressurizing, and atomizing fuel directly into the engine's combustion chamber at extremely high pressures (up to 2,200 bar or more in later models).
Electronically Controlled: It is actuated by the engine's Electronic Control Unit (ECU) via a solenoid valve. This allows for precise timing and fuel quantity control for optimal performance, low emissions, and fuel efficiency.
Critical for Performance: A faulty injector can cause a wide range of problems, including loss of power, excessive smoke, high fuel consumption, rough running, increased emissions, and cylinder imbalance.
Structural Characteristics:
Unit Injector Design: Integrates the high-pressure pump and injection nozzle into a single, compact unit mounted directly in the cylinder head. This eliminates high-pressure fuel lines.
Electro-Hydraulic Actuation: Uses a high-speed solenoid valve controlled by the ECU to precisely manage a hydraulic servo system, which then drives the injector plunger.
Multi-Orifice Nozzle: Features a precision-machined nozzle with multiple tiny holes for optimal fuel atomization and spray pattern tailored to the MTU 4000 combustion bowl.
Integrated Electronics: Contains the solenoid and often a calibration data chip (QR/alpha code) for individual identification by the engine ECU.
Technical Advantages:
Extremely High Injection Pressure: Capable of generating pressures over 2,200 bar, ensuring superior fuel atomization for complete combustion.
Precision & Flexibility: ECU control allows for multiple injection events (pilot, main, post) per cycle, reducing noise and emissions.
Fast Response & High Accuracy: The direct design and fast solenoid enable precise fuel metering and timing, crucial for performance and efficiency.
Reduced Hydraulic Losses: The unit design minimizes pressure losses compared to common-rail systems with long lines.
2. Main Application Scenarios & Equipment
This injector is used exclusively in MTU Series 4000 high-speed diesel engines, known for their high power density and reliability in demanding sectors:
Marine:
Propulsion: High-performance yachts, fast ferries, patrol vessels, offshore supply vessels.
Auxiliary Power: Onboard generator sets (gensets).
Power Generation:
Heavy Industrial & Rail:
Locomotives (e.g., certain diesel-electric models).
Pump and compressor drives in the oil & gas industry.
3. OEM Cross-Reference Numbers
Crucial Note: Always verify cross-references with your engine S/N. The primary OEM supplier is Bosch. Numbers can vary by engine model and production year.
MTU/Rolls-Royce Solutions: X52407500063 (Your reference number)
Robert Bosch GmbH (Likely OE Manufacturer): 0445020045, 0445020096, 0 445 020 045 (Format varies. These are common references, but must be verified).
Other Aftermarket/Alternative Brands: Reputable brands like L'Orange (also part of Rolls-Royce) or Stanadyne may offer equivalents. Their part numbers would be specific to their catalogs.
The injector's physical calibration code is more critical for ordering than the part number alone.
4. Daily Maintenance Suggestions
Preventive maintenance is key to longevity:
Fuel Quality is Paramount: Use only ultra-low-sulfur diesel (ULSD) meeting the specification required by MTU (e.g., ISO 8217 for marine). Contaminated fuel is the #1 cause of injector failure.
Fuel Filtration: Strictly adhere to service intervals for primary and secondary fuel filters. Use only genuine or high-quality replacement filters. Change filters immediately if water contamination is suspected.
Water Separation: Drain water from fuel filter/water separators daily or as per the operations checklist.
Regular Operation: Allow the engine to reach normal operating temperature and run at varying loads to help keep the injectors clean.
Monitoring: Pay attention to early warning signs: uneven running, increased smoke, higher fuel consumption, or fault codes. Perform cylinder balance tests (via engine ECU) periodically to detect underperforming injectors.
Professional Servicing: Leave removal, installation, and mandatory coding/calibration to technicians trained on MTU engines using proper tools and software (MDEC/MOP). Never install a new injector without programming its calibration code into the ECU.
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