Common Rail Injector 7485023251 7485023258 7485030847 Diesel Injector for Vo-lvo

This electronically controlled high-pressure diesel fuel injection assembly (Part ID: 20564425; common OE cross-references include 85000606, BEBE4D10001, BEBE4D29001, BEBE4D40001, BEBE4D20002, etc.) is precision-engineered for 12.1L large-displacement, inline-six heavy-duty diesel engines. It is widely utilized in long-haul logistics tractors, intercity coaches, heavy-duty crawler excavators, and industrial emergency backup generator sets. Serving as the critical terminal component for controlling spray atomization and injection timing within the high-pressure fuel supply system, it coordinates the mechanical stroke of the camshaft with the millisecond-level response of the electromagnetic control valve. This enables rapid fuel pressurization and uniform dispersion into ultra-fine droplets, promoting thorough mixing with intake air and ensuring complete combustion.

The component is manufactured to rigorous standards regarding precision tolerances, resistance to high-frequency reciprocating fatigue, and superior impact resistance. Its internal precision plunger assembly and nozzle needle valve set are crafted from aerospace-grade, high-carbon chromium alloy steel. These parts undergo ultra-precision geometric grinding and low-friction mirror polishing, and feature a dense, ultra-hard, wear-resistant, and anti-corrosive surface coating. This effectively prevents scoring, wear, and internal pressure leakage caused by impurities in low-quality fuel. Upon installation, mechanics and drivers will notice immediate improvements in engine performance: rapid and decisive cold starts; smooth, quiet idling free from abnormal resonance; and responsive, robust throttle action during fully loaded starts, sustained uphill towing, or high-speed cruising. Power delivery is consistent and linear, exhaust smoke is significantly reduced, and the engine regains ample torque output and excellent fuel efficiency.

Standardized manufacturing and rigorous quality control at our own production facilities. We effectively reduce procurement costs by eliminating the excessive markups associated with multiple intermediaries, while simultaneously addressing issues such as tolerance deviations, inconsistent cylinder fuel injection volumes, and high-pressure leakage risks. Utilizing standardized production lines, we implement strict assembly tolerance controls and eliminate multiple price-inflating layers; this ensures highly balanced injection pressure and fuel volume across all cylinders, providing reliable power for heavy-duty equipment while cutting maintenance budgets.

Strict calibration on ultra-high-pressure digital dynamic test benches across all operating conditions. Inferior replacement parts often suffer from electromagnetic actuation lag or pressure-relief valve sticking—causing severe engine vibration or misfires, and wasting labor hours on repeated disassembly and adjustment. Each injection assembly is assembled in a clean-room environment and then tested on a fully automated digital test bench. Here, pre-injection volume, full-load flow, and fuel return sealing are comprehensively calibrated under simulated extreme ultra-high-pressure and high-temperature conditions. This ensures "ready-to-install" performance, drastically saving time and costs associated with installation and tuning.

Large-scale warehousing with consistent stock availability and rapid shipping. Commercial heavy-duty trucks and construction machinery are high-utilization assets; fuel system failures can lead to costly downtime and lost productivity. Our warehouse maintains ample inventory, with orders packed and shipped within 24–48 hours of confirmation. This significantly shortens logistics wait times, helping fleets and end-users quickly resume operations and avoid losses caused by equipment downtime.

High-hardness, specially quenched alloy needle valves with wear-resistant hardened coatings. These components address issues common in challenging operating environments—such as poor diesel lubricity and sulfur impurities—which often cause premature wear and plunger scoring or seizing in precision mating parts. Core components utilize high-hardenability specialty bearing steel and advanced anti-corrosion, wear-resistant surface coatings. This significantly enhances mechanical fatigue resistance and wear life, ensuring stable performance during prolonged, high-load operation in harsh environments and reducing the extra costs associated with frequent repairs.

| Parameter Name | Parameter Value |
| --- | --- |
| Product Name | Electronically Controlled Unit Injector (EUI) for Heavy-Duty Commercial Vehicles & Construction Machinery |
| Standard Part Number | 20564425 |
| Cross-Reference Numbers | 85000606 / BEBE4D10001 / BEBE4D29001 / BEBE4D40001 / BEBE4D20002 |
| Applicable Engine Platform | 12.1L Inline-6 ​​High-Displacement Heavy-Duty Diesel Engine Platform |
| Fuel Supply System | Electronically Controlled Unit Injector / High-Pressure Unit Injection System (EUI / PDE System) |
| Core Component Material | Aerospace-grade vacuum-quenched bearing steel / High-hardness, corrosion-resistant special alloy |
| Surface Treatment | Nanoscale, high-density, ultra-hard, wear-resistant, and anti-corrosion coating |
| Nozzle Hole Machining | High-precision EDM (Electrical Discharge Machining) multi-hole micro-arc process |
| Maximum Injection Pressure | ≥ 2000 bar (steady-state peak) |
| Operating Temperature Range | -40°C to +125°C |
| Internal Sealing Components | OEM-grade high-temperature and swell-resistant special fluoroelastomer (FKM O-rings) |
| Unit Net Weight | Approx. 1.45 kg / piece |
| Factory Inspection Standard | 100% automated test bench verification covering pressure, flow rate, and sealing under all operating conditions |
| </Specifications Table> | |

Heavy-duty tracked excavators and quarrying operations: Heavy excavation equipment operates continuously in mining areas and earthmoving sites, enduring harsh conditions characterized by heavy dust, intense vibration, and extreme excavation loads. Maintenance teams install a full set of these electronically controlled unit injectors when the powertrain exhibits symptoms such as difficult cold starts, heavy black exhaust smoke, or sudden RPM drops during heavy-load excavation. The high-precision, finely atomized fuel spray rapidly restores the engine to its rated torque, ensuring that mining and excavation projects proceed smoothly and on schedule.

For heavy-duty, long-haul highway logistics and passenger transport: Highway tractors and large coaches equipped with high-horsepower 12.1L diesel engines operate fully loaded around the clock, facing conditions that include long-distance cruising and frequent hill climbing and acceleration. When vehicles exhibit sluggish power response under heavy throttle, stalling on inclines, or abnormal spikes in combined fuel consumption, on-site maintenance personnel can promptly install this high-spec fuel injection assembly. Its uniform, rapid, ultra-high-pressure injection ensures smooth, responsive acceleration under heavy loads, guaranteeing the safe and punctual completion of trunk-line transport missions.

Q: Can the new fuel injector be installed and used immediately upon receipt? What precautions should be taken?
A: All fuel injection assemblies undergo precise calibration on fully automated test benches before leaving the factory and are ready for immediate installation. Before installation, thoroughly clean carbon deposits and impurities from the cylinder head nozzle bore and fuel passages; replace the high-temperature-resistant sealing O-ring and thermally conductive metal washer; tighten the hold-down clamp to standard torque specifications; and fully bleed air from the fuel system before starting the engine to ensure proper operation.

Q: What are the shipping turnaround times and stock availability for bulk orders?
A: Backed by our manufacturing plant and standardized warehousing centers, we maintain ample stock of this key specification year-round. Standard bulk orders are packed and shipped within 24–48 hours of confirmation, and we can rapidly schedule production for large-scale fleet supply plans.

Q: What professional inspections does the product undergo before leaving the factory to ensure quality?
A: Assembly takes place in an ultra-clean workshop, and every finished unit must pass 100% automated bench testing. Comprehensive inspections cover cold-start pressure buildup, idle flow rate, consistency of maximum injection volume at full load, fuel return volume, and high-pressure sealing integrity (zero leakage), ensuring that every unit is of premium quality upon delivery.

Q: What is the warranty period for the product? How are after-sales inquiries handled?
A: We offer a 12-month warranty on this electronically controlled fuel injector. Should any performance issues arise during the warranty period due to causes other than external physical damage or contamination from poor-quality fuel, we provide rapid replacement and professional technical support to ensure your long-term, stable operation.