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The c-aterpillar 171-9704 fuel injector is a high-reliability, OEM-compatible HEUI (Hydraulic Electronic Unit Injector) exclusively designed for c-aterpillar C9.3 series diesel engines, with cross-reference part numbers 1719704, 171-9704, 222-5965, 155-1819, and 173-9379. As a core component of the C9.3 engine’s fuel delivery system, it fully complies with c-aterpillar’s original design standards and performance parameters, while also maintaining broad compatibility with c-aterpillar 3126B and 3126E series engines (engine code 3126B HEUI) for expanded applic-ation scenarios. Optimized for the C9.3 engine’s 9.3L displacement and 270–390 horsepower output, this injector is equipped with a precision-machined 5-hole VCO nozzle (0.014 inch hole size) with a 158° spray pattern, delivering ultra-accurate fuel metering (error ≤±2%), precise injection timing, and superior atomization effect—its atomization particle size can be as fine as 15 microns, equivalent to 1/10 of a human hair, forming a 98% suspended oil film to achieve an ideal air-fuel mixture ratio of 14.2:1. With a rated working pressure of 2100–2500 bar, it ensures efficient, stable, and clean combustion, effectively reducing fuel consumption by 3–5% compared to conventional injectors and minimizing harmful emissions (CO reduced by 32%, HC reduced by 48%) to meet EU Stage V, EPA Tier 4 Final, and global environmental standards. Manufactured in strict compliance with c-aterpillar OEM standards and ISO 9001 certific-ation requirements, each unit undergoes 100% professional factory bench testing, including high-pressure performance verific-ation, spray pattern detection, and strict sealing inspection, ensuring reliable performance and consistent quality even in the harshest heavy-duty working conditions. It features a high-strength stainless steel body with vacuum quenching heat treatment (hardness HRC62-65), significantly enhancing wear resistance and service life, which can perfectly match the C9.3 engine’s overhaul cycle and adapt to harsh operating environments such as construction sites, mining areas, industrial workshops, and marine vessels. As a direct OEM replacement part, it supports plug-and-play installation without any modific-ations to the engine or fuel system, effectively solving common engine problems such as misfires, power loss, excessive fuel consumption, and abnormal emissions caused by injector wear, aging or failure. Available as a new aftermarket part with a 12-month quality warranty, MOQ of 6 pieces (negotiable), neutral or original export packaging (customizable according to customer requirements), and fast global logistics delivery (3-7 working days), the 171-9704 injector is a cost-effective and reliable choice for maintaining the peak performance of c-aterpillar C9.3 series engines, widely supplied to global aftermarket markets including North America, Europe, and Southeast Asia, and compatible with a variety of C9.3-powered heavy equipment. Its optimized HEUI system ensures fast response (≤18ms), enabling multiple injections to further optimize combustion process, reduce noise, and lower emissions, while its stable performance ensures minimal downtime for equipment operations.

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