0445120177 Diesel Fuel Injector 0445 120 177 5254261 Injector Nozzle Assembly for Cu-mmins

<Product Description>
This heavy-duty, electronically controlled high-pressure common-rail diesel fuel injector assembly (Part ID: 0445120177 / 0 445 120 177; common OE cross-references include 0986435543, 5263310, 4940173, D4940173, etc.) is precision-engineered for the ISBe/ISDe/QSB 4.5L and 6.7L inline diesel engine platforms. It is widely used in medium-to-heavy-duty trucks, construction excavators, intercity buses, and industrial generator sets. As a core actuator within the fuel supply system responsible for controlling diesel atomization quality and pulse injection timing, it precisely meters high-pressure diesel and rapidly disperses it into ultra-fine particles—triggered by millisecond-level electrical signals—to ensure optimal mixing and combustion with the intake airflow.

Designed and manufactured to standards emphasizing "micro-level precision fit" and "millisecond-level agile response," the component features a core control valve and needle valve assembly crafted from aerospace-grade, hardened special alloy steel. These parts undergo ultra-high-precision geometric grinding and low-friction polishing, finished with a dense, ultra-hard coating that effectively prevents internal scratching and pressure loss caused by fuel impurities. Upon installation, drivers and technicians will notice immediate improvements: crisp, clean cold starts and quiet, vibration-free idling. Whether climbing steep slopes, navigating stop-and-go traffic, or cruising long distances, the throttle response is sharp and sensitive, and acceleration is robust yet smooth. Additionally, the unit reduces black smoke emissions, delivering superior fuel efficiency and a stable, refined driving experience.
</Product Description>

<Product Advantages>
Standardized smart manufacturing and rigorous quality control directly from the source factory. **Cost-effective sourcing by eliminating intermediary markups.** By leveraging standardized production bases for end-to-end quality control and removing unnecessary middlemen, we ensure highly consistent injection pressure and flow rates across all cylinders. This approach not only cuts maintenance budgets but also provides reliable, robust power for vehicle and equipment operations.

**Rigorous testing on ultra-high-pressure digital dynamic test benches.** Low-quality replacements often suffer from response lag and pressure-release malfunctions—causing engine misfires and vibration—as well as wasted labor and costs due to repeated installation and adjustment. Every injection assembly undergoes automated testing before leaving the factory; flow rates and sealing integrity are precisely calibrated across various pressure ranges in simulated high-temperature, ultra-high-pressure environments. This ensures "ready-to-install" performance, drastically saving time and costs associated with installation and tuning.

**Large-scale warehousing and rapid shipping response.** Vehicles used for daily commuting and commercial transport are high-utilization assets; fuel system failures can lead to costly downtime and revenue loss. Our warehouse maintains ample stock, with orders packed and shipped within 24–48 hours of confirmation. This significantly reduces logistics wait times, helping fleets and owners quickly resume operations and avoid losses caused by vehicle downtime.

**Special-quenched alloy needle valves with wear-resistant hardened coatings.** In regions where diesel fuel has poor lubricity or high sulfur content—factors that often cause premature wear and valve sticking in precision components—we provide a superior solution. Our core components utilize high-hardness special bearing steel and anti-corrosion surface treatments. These enhancements offer exceptional fatigue and wear resistance, ensuring stable performance even under harsh conditions and prolonged high-load operation, thereby reducing the extra expenses associated with frequent repairs. </Product Advantages>

<Specifications>

| Parameter Name | Parameter Value |
| --- | --- |
| Product Name | Electronically Controlled High-Pressure Common Rail Injector for Heavy-Duty Trucks & Construction Machinery |
| Standard OE Part Number | 0445120177 |
| Cross-Reference Numbers | 0 445 120 177 / 0986435543 / 5263310 / 4940173 / D4940173 |
| Compatible Engine Platforms | ISBe / ISDe / QSB 4.5L & 6.7L Diesel Engine Platforms |
| Fuel Supply System | High-Pressure Electronically Controlled Common Rail System |
| Core Needle Valve Material | Aerospace-grade hardened bearing steel / Corrosion-resistant, high-hardness special alloy |
| Surface Treatment | High-density, ultra-wear-resistant hardened coating |
| Nozzle Hole Machining | High-precision EDM (Electrical Discharge Machining) micro-hole processing |
| Maximum Operating Pressure | ≥ 1800 bar |
| Operating Temperature Range | -40°C to +125°C |
| Internal Sealing Components | OEM-grade high-temperature and swell-resistant special fluoroelastomer (FKM O-rings) |
| Net Weight (Per Unit) | Approx. 0.68 kg |
| Factory Testing Standards | 100% automated test bench verification of flow and sealing across all operating conditions |
| </Specifications> | |

<Application Scenarios>
Construction sites and heavy machinery operations: Excavators and loaders operating continuously in mining and earthmoving environments often face high-load and high-dust conditions. When equipment experiences slow starting, rough idling, or stalling under heavy loads, maintenance teams install this injector assembly. Precise fuel atomization enables the engine to deliver strong torque at low RPMs, ensuring stable performance under heavy-load demands. Application Scenario: Intercity freight and logistics delivery using medium-duty trucks. These vehicles frequently travel between intercity trunk routes and urban roads, often facing conditions that require starting under full load and navigating stop-and-go traffic. When drivers notice sluggish acceleration, a lack of power on inclines, or a significant increase in fuel consumption, maintenance personnel can promptly replace the unit with a full set of high-precision common-rail fuel injectors. Post-installation, fuel injection pressure builds up quickly and stably, and acceleration under heavy loads is robust and smooth, ensuring freight tasks are completed on time and efficiently.

Q: Can the product be used immediately after installation, or do I need to input a correction code?
A: Each fuel injector is assigned a unique flow correction code (IMA/QR code) during factory testing. We recommend using a diagnostic tool to program this code into the engine control unit (ECU) after installation to ensure optimal fuel efficiency and smooth operation.

Q: What are the stock levels and lead times for bulk orders?
A: We operate our own factory and large-scale warehouses, maintaining substantial stock of this model year-round. Standard orders are typically packed and shipped within 24–48 hours, while bulk orders can be quickly scheduled for production.

Q: How are product quality and performance ensured before shipment?
A: All fuel injectors undergo assembly in a Class 100 cleanroom environment and 100% bench testing across all operating conditions. Tests cover critical parameters such as sealing integrity, pilot injection volume, full-load injection volume, and fuel return volume; our rigorous standards ensure that every unit shipped is of premium quality.

Q: What is the warranty period, and how is after-sales support handled?
A: We offer a 12-month warranty. Should any performance failure occur due to non-human factors during the warranty period, we provide rapid replacement or technical support to ensure a worry-free experience.