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Common Rail Diesel Fuel Injector Assembly 3349861 for Cumm-ins Engine Nt855-G4 Series
| MOQ: | 1 pieces |
| Price: | US $131.32-142.32 |
| Payment Method: | L/C,D/A,D/P,T/T,Western Union |
| OE No. | 3349861 |
| Type | Fuel Injector |
| Car Make | Diesel Car |
| Packing | Neutral Packing or Customize Packing |
| Warranty | 1 Year |
| MOQ | 1PC |
This heavy-duty diesel engine injector (OE No.: 3349861) is an electronically controlled precision fuel injection assembly specifically designed for large-displacement, high-power power systems. It is precisely adapted to various high-horsepower heavy-duty diesel engines and is widely used in special-purpose highway freight trucks, special engineering transport machinery, off-highway large-tonnage mining dump trucks, and industrial-grade large generator sets operating under long-term continuous high loads. Adhering to the design and manufacturing philosophy of "high pressure resistance and ultimate atomization," this product utilizes micron-level porous atomization channel distribution technology to achieve ultra-fine fuel atomization, comprehensively optimizing the atomization and combustion geometry within the cylinder. When your heavy-duty machinery is equipped with this new injector and put into operation, you will intuitively feel the crisp response of the engine during cold starts. Previously sluggish horsepower drops, stalling under overload, and idling vibrations will disappear. Exhaust emissions will be fully purified, and the powerful, linear, and lag-free power output will bring your equipment a highly reliable heavy-duty handling experience.
Large-scale, self-owned factory, direct sales.
Our vertically integrated manufacturing base eliminates the multi-level markups of traditional cross-border parts trading, completely eradicating the predicament of high premiums and substandard products often encountered in overseas distribution markets for heavy-duty special parts. From the precision grinding of internal needle valve components to the overall assembly, we achieve closed-loop control of the production line, providing global buyers with transparent and reasonable factory-direct prices, significantly reducing the long-term reorganization and maintenance costs of fleets.
Normalized, saturated warehousing with readily available stock for rapid delivery.
For this high-frequency consumable injector (3349861), which has an extremely large presence in heavy-duty freight and special industrial power sectors, our modern warehouses maintain a consistently saturated inventory of finished products. This effectively mitigates the huge downtime losses caused by critical fuel system component failures and equipment breakdowns in engineering projects or highway freight fleets, supporting 24/7 lightning-fast cross-border delivery.
100% Fully Automated Digital Closed-Loop Rigorous Pressure Testing.
Every electronic fuel injector undergoes rigorous screening on a dedicated fully automated test bench before being sealed and packaged. Comprehensive closed-loop calibration is performed on ultimate opening pressure, multi-point dynamic injection volume, return rate, and the transient electronic control response of the control valve coil. This effectively eliminates the fatal hidden dangers of needle valve adhesion and high-pressure dripping in the cylinder leading to carbon buildup and cylinder scoring, commonly found in low-end substitutes. This provides frontline mechanics with a worry-free experience of successful installation on the first try, requiring no rework or fine-tuning.
| Parameter Name | Parameter Value |
|---|---|
| OEM Universal Part Number | 3349861 |
| Cross-Reference Code | 334986100 / 3349861PX / 4903472 |
| Applicable Engine Series | Large Displacement Heavy-Duty Diesel Engine Series |
| System Structure Category | Electrically Controlled Heavy-Duty Individual/High-Pressure Common Rail Injector System |
| Applicable Representative Machinery | Heavy-Duty Long-Distance Trucks, Special Engineering Vehicles, Mobile Generator Sets |
| Internal Needle Valve Material | High-Hardness Industrial-Grade Heavy-Duty High-Speed Alloy Steel |
| Surface Process Characteristics | Overall Rust-Proofing, Anti-Oxidation Passivation, and High-Temperature Anti-Tear Nano-Treatment |
| Nozzle Geometry Design | High-Precision Multi-Porous Fine Atomization Channel Distribution |
| Net Weight per Unit | Approx. 0.83 kg |
| Quality Control Qualification | 100% Digitally Calibrated and Coded for Warehousing |
Heavy-Duty Highway Freight and All-Weather Mountain Climbing Transport:
In cross-border logistics and on steep, undulating mountain roads, heavy trucks carrying tens of tons of cargo face extremely demanding horsepower tests. When drivers frequently change lanes and floor the accelerator, the 3349861 injector, with its microsecond-level fuel supply correction capability, precisely adjusts the injection pulse width instantaneously, ensuring complete fuel combustion and providing the engine with high torque at low speeds, guaranteeing efficient and timely delivery of long-haul freight.
Large-Scale Infrastructure Projects and Harsh Mining Environment Operations:
In dusty, harsh mining sites, large-tonnage construction machinery needs to perform high-load tunneling continuously every day. The injector's internal components undergo enhanced surface corrosion protection and nano-hardening treatment, enabling it to withstand the high fluid impacts of rough working environments, providing stable and continuous fuel supply, and effectively avoiding the huge collateral damage to the entire operation line caused by sudden breakdowns in remote areas.
Commercial Vehicle Specialized Chain Repair Center Overhaul and Old Vehicle Refurbishment:
When heavy-duty trucks or generator sets are brought in for major repairs due to long-term use of impure diesel fuel, resulting in severely worn injector valve cores, frequent heavy black smoke emissions, and extreme difficulty in cold starts, experienced mechanics directly select this brand-new injector, perfectly matching the original factory parameters. Because the physical interface and electrical wiring fit together seamlessly, ignition is successful on the first try, and all pressure and return fuel data perfectly meet standards.
Q: Is it a purely mechanical injector or an electronically controlled injector that requires connection to a computer?
A: This product belongs to a modern electronically controlled fuel system injector assembly. It contains precision electrical connectors for connecting to the engine's ECU main control computer. It is specifically designed for heavy-duty engines with electronically controlled high-pressure injection systems. Please confirm your engine model and fuel system structure before purchasing.
Q: As an overseas independent website buyer, if I order multiple sets for fleet refurbishment, how fast is the factory delivery?
A: Due to the extremely large global market share of this series of engines in heavy-duty transportation and engineering power, this injector is a flagship best-selling component in our factory, and our warehouse maintains a consistently high inventory. Whether it's retail or large wholesale orders of dozens of units or more, we can complete the order fulfillment within 24-48 hours.
Q: What installation details should the mechanic be specifically instructed on when replacing this high-precision injector?
A: Before installing a brand new injector, please thoroughly clean the injector sleeve on the cylinder head to forcibly remove any residual hard carbon deposits and impurities. During installation, it is strictly forbidden for any fine dust to fall into the inlet, and brand new original factory specification sealing copper gaskets and O-rings must be used, tightened evenly according to the specified torque to prevent cylinder leakage.
Q: How well do your factory's products perform in terms of wear resistance when facing varying diesel quality?
A: In response to the inconsistent quality of diesel fuel in field environments or under certain special working conditions, our factory has applied a special nano-level hardening coating process to the internal needle valve assembly and control valve surface of this injector. Its wear resistance, oxidation resistance, and fluid shock resistance are significantly stronger than ordinary replacement parts, which can effectively extend the overall service life.
