Fuel Injector Assembly 4955524 4964171 Kta19 Qsk19 K19 Diesel Engine Mining Truck

This heavy-duty diesel engine electronic fuel injector (OE No.: 4903472) is a high-precision fuel injection device specifically designed for large-displacement, high-load industrial and commercial power systems. This component is precisely fitted to the ISX15 and QSX15 series heavy-duty diesel engines and is widely used in heavy-duty long-haul trucks, large-tonnage special engineering transport vehicles, mining dump trucks, and industrial-grade high-power mobile diesel generator sets. The product is manufactured with the industrial philosophy of "high pressure resistance and fine atomization," relying on a micron-level porous fine atomization flow channel distribution to comprehensively optimize the fuel geometry distribution inside the cylinder, ensuring precise injection pulse width under extreme high-load conditions. After replacing the old injector with this high-quality new one, the driver or equipment operator can intuitively feel a crisper and more efficient engine cold start. The idling vibrations, sudden horsepower reduction, and engine stalling caused by internal wear and pressure loss of the old parts completely disappear. The engine's sound returns to a deep and solid state, and the power response is smooth and linear, ensuring that high-asset equipment returns to peak operating efficiency.

• Large-scale, self-owned factory with direct vertical supply. We have an independent industrial-grade parts manufacturing base, directly eliminating the multi-level distributor markups in traditional cross-border parts trade. This completely eradicates the high premiums and chaotic sourcing channels often encountered by heavy-duty special parts in overseas distribution markets. From the precision grinding of internal valve core components to the overall assembly, we achieve closed-loop production line control, providing global buyers with transparent and reasonable factory-direct prices, significantly reducing the long-term maintenance and spare parts preparation costs for fleets.
• Normalized, saturated warehousing with rapid outbound distribution. For this flagship consumable injector (4903472), which has an extremely large market share in heavy freight and industrial special machinery, our modern warehouses maintain a saturated inventory of finished products. This effectively mitigates the huge losses caused by project or logistics fleet delays due to sudden damage to critical fuel system components or parts shortages, forcing machinery to remain idle for extended periods. This supports 24/7 lightning-fast outbound shipments across borders.
• 100% Fully Automated Digital Closed-Loop Rigorous Pressure Quality Inspection. Every electronic fuel injector undergoes rigorous screening on a dedicated CNC high-pressure testing bench before being sealed and shipped. This involves comprehensive closed-loop calibration of the limit opening rail pressure, multi-point dynamic injection volume, high-pressure return rate, and the transient electrical 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 non-standard substitutes. This provides frontline mechanics with a worry-free experience of successful installation on the first try, requiring no rework or adjustment.

• Long-distance highway logistics and all-weather uphill operations for heavy-duty vehicles: On cross-border trunk lines and steep, undulating mountain roads, heavy-duty tractor trucks carrying tens of tons of cargo face extremely demanding horsepower tests. When drivers frequently change lanes and press the accelerator hard, the 4903472 injector, with its microsecond-level fuel supply correction capability, can instantly and precisely adjust the injection pulse width to ensure complete fuel combustion, giving the engine high torque at low speeds and ensuring efficient and timely delivery of long-distance freight.
• Large-scale infrastructure projects in the field and mining operations in harsh environments: In dusty and harsh mining environments, large-tonnage construction machinery needs to perform high-load tunneling continuously every day. The internal components of this injector undergo enhanced surface anti-corrosion and nano-hardening treatment, enabling it to withstand high fluid impacts in harsh operating environments, ensuring stable and continuous fuel supply, and effectively avoiding the significant collateral damage to the entire production 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 thick black smoke emissions, and extreme difficulty in cold starts, experienced mechanics directly select this brand-new injector, which perfectly matches the original factory parameters. Because the physical interfaces and electrical wiring fit seamlessly, ignition passes on the first try, and all pressure and return data perfectly meet standards.

Q: Is it a purely mechanical injector or an electronically controlled injector that requires a computer connection?

A: This product belongs to a modern electronically controlled fuel system injector assembly. It is equipped with a dedicated precision electrical connector on top 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 buyer, how fast is the factory delivery if I order multiple sets for fleet maintenance?

A: Due to the extremely large market share of this series of powertrains in the global heavy-duty transportation and engineering power sectors, this injector is one of our factory's best-selling components, and our warehouse maintains a full inventory year-round. Whether it's a retail order or a large wholesale order of dozens of units or more, we can complete the shipment quickly within 24-48 hours.

Q: What installation details should I specifically instruct the mechanic about when replacing this high-precision electronically controlled 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 sand or dust to fall into the inlet, and you must use brand new original factory-spec sealing copper gaskets and O-rings, tightening them 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 faced with varying diesel quality?

A: In response to the inconsistent diesel quality in outdoor environments or 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 resistance to fluid impact are significantly stronger than ordinary replacement parts, effectively extending its overall service life.