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The 5491659 fuel injector is a high-precision electronically controlled common rail component specifically developed for c-ummins QSL series diesel engines, featuring full compatibility with QSC8.3, QSL9, QSL9.3, ISL9.5 and 6C8.3 engines—core models in c-ummins’ medium-duty diesel engine lineup. It offers seamless interchangeability with OEM cross reference numbers 5491659, 4928421, 4821827, 4327072, 4307452, 2872069, fully complying with c-ummins’ strict quality standards and technical specific-ations for high-pressure common rail systems, which are renowned for their precision and reliability. As a direct OEM replacement part, it perfectly matches the displacement range and power output of the QSL series, integrating smoothly with the engine’s high-pressure common rail fuel system and CM2250, CM2350 electronic control systems, making it a dependable replacement for c-ummins QSL9, QSL9.3 and QSC8.3 engine fuel injectors. This injector is a crucial component for medium-duty engine performance, widely applied in various working scenarios such as commercial vehicles (including Dongfeng), heavy-duty construction machinery, industrial equipment, light-duty mining machinery, and diesel trucks—typical applic-ation fields of QSL, QSC8.3, ISL9.5 and 6C8.3 engines. Functioning as a high-precision electronically controlled solenoid valve, it operates as a normally closed valve—remaining closed without control signals and opening when the ECU sends an injection command, ensuring precise fuel delivery. Capable of withstanding the fuel system’s high-pressure requirement of up to 1800 bar, it ensures stable and efficient fuel delivery even under long-term full-load operation in harsh environments with dust, high humidity, or extreme temperature fluctuations. It responds accurately to signals from the engine’s ECU (Electronic Control Unit) with an ultra-fast response time of <0.1ms, ensuring precise fuel metering (with an error of no more than ±2%) and optimal combustion efficiency, which is critical for meeting strict emission standards. This level of precision is achieved through micron-level manufacturing, with a 2μm plunger clearance—equivalent to 1/50 of a human hair—and precision-machined 0.12mm spray holes for ultra-fine atomization, cooperating with the engine’s cylinder design to ensure uniform fuel-air mixing. This not only reduces exhaust emissions to meet relevant environmental standards but also improves fuel economy and reduces engine noise and vibration. Equipped with advanced multi-stage injection technology (pre-injection, main injection, post-injection), it optimizes the combustion process, enhances idle stability, and significantly extends the engine’s service life. Its enhanced anti-wear and corrosion-resistant design, featuring a precision-ground anti-wear alloy plunger and hardened stainless steel nozzle tip, effectively resists abrasion, corrosion from harsh fuels, and high-pressure impact, adhering to c-ummins’ strict production standards for reliable performance and longer service life. Constructed with premium heavy-duty steel and iron through strict screening, including high-strength steel for the body, high-temperature resistant copper solenoid coil, and high-seal O-rings for effective oil-fuel separation and leakage prevention, this injector boasts excellent adaptability to extreme temperatures (-40°C to 180°C) and harsh working conditions. Every unit undergoes rigorous factory testing, including pressure calibration, flow measurement, spray pattern validation, and leakage checks, and has obtained relevant certific-ations such as ISO 9001 and CE, ensuring reliable performance and consistent quality. With a comprehensive set of OEM cross reference numbers, it offers ready-to-ship inventory, customizable neutral packaging options, a 3-6 month warranty, and reliable after-sales support, with delivery available within 5-7 working days via DHL, FedEx, TNT or UPS, making it the ideal choice for maintaining the performance, efficiency, and longevity of c-ummins QSL series engines in various demanding commercial, industrial, and construction scenarios.

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