CUMMINS Factory QSK23 High Quality Fuel Injector 4954801 4326639 4921360 4088430 For Engine QSK78 Generator HSK78G Original New Injector

The 4326639 fuel injector is a premium OEM-grade common rail component specifically engineered for c-ummins QSK23 series diesel engines, fully compliant with c-ummins strict quality standards and specific-ations[superscript:1], and designed as a direct replacement part to perfectly match the QSK23’s 23L displacement and 760-969 HP power range. As a core component of the high-pressure injection (HPI) system of QSK23 engines[superscript:3][superscript:6], it is specially tailored for harsh heavy-duty applic-ations including oilfield equipment, mining machinery, large-scale construction equipment, and industrial generator sets[superscript:7][superscript:9], where long-term reliability, stable performance and high fuel efficiency under extreme working conditions are critical. This injector adopts advanced electronic control technology, functioning as a normally closed valve that opens precisely when receiving signals from the engine’s ECU[superscript:1], ensuring accurate fuel delivery and optimal combustion efficiency even in complex oilfield and mining scenarios. It features high-pressure fuel delivery up to 1800 bar (26108 psi)[superscript:5], combined with ultra-fine atomization (≤33 microns) leveraging precision-machined spray holes (0.12mm in diameter) to guarantee uniform fuel distribution[superscript:5], effectively reducing exhaust emissions to meet US EPA Tier II and EU Stage IIIA standards, while improving fuel economy by 8-11% compared to conventional injectors. Equipped with an ultra-fast responding solenoid (opening/closing time <0.1ms)[superscript:5], it enables precise multi-stage injection (pre-injection, main injection, post-injection) to optimize combustion efficiency, minimize engine noise and vibration, and extend the engine’s service life significantly. Constructed with premium wear-resistant materials selected through strict screening[superscript:1], including heat-treated high-strength alloy steel for the body, stainless steel nozzle tip with tungsten carbide coating (HRC72) for enhanced durability and corrosion resistance, high-temperature resistant copper solenoid coil, and Viton fluoroelastomer seals to ensure effective oil-fuel separation and prevent leakage[superscript:1], this injector boasts excellent adaptability to extreme temperatures (-40°C to 170°C) and harsh working environments such as high-humidity oilfield sites. Every unit undergoes strict factory testing, including pressure calibration, flow measurement, spray pattern validation, and leakage checks[superscript:1], to ensure perfect compatibility with c-ummins QSK23 engine control systems and direct replacement for original parts. With a comprehensive set of OEM cross reference numbers, it offers hassle-free installation (professional installation is recommended for oilfield equipment) and reliable after-sales support, including a 12-month warranty[superscript:1] and global service network coverage, making it the ideal choice for maintaining the performance, efficiency, and longevity of c-ummins QSK23 series engines in demanding oilfield, mining and industrial scenarios.