original 2645A746 2645A738 Common Rail Fuel Injector 320-0677 321-3600 10R-7971 for C4.4 C6.6 Engine E320D E323D M313D Excavator 420E 430E 450E Spare Parts original new injector

Engineered for demanding industrial duty cycles, the 2645A746 common rail fuel injector delivers OEM-equivalent performance for C6, C6.4, and C6.6 diesel engines used across construction, mining, agriculture, marine, and power generation sectors. This unit directly cross-references OE numbers 2645A746, 326-1643, and 3261643, providing a plug-and-play replacement solution for excavators, wheel loaders, bulldozers, generator sets, and stationary industrial power units operating in global markets.

Manufactured from high-strength alloy steel with CNC-machined internals and micron-level tolerances, the injector withstands common rail pressures exceeding 1,800 bar while maintaining precision spray geometry. The advanced nozzle design produces uniform fuel atomization and supports pilot, main, and post injection strategies for optimized combustion, reduced emissions, and improved fuel economy. Heat-treated components and protective surface treatments ensure enhanced durability, corrosion resistance, and extended service intervals under continuous heavy-duty operation. Emission compliance supports Tier 3 and Tier 4 engine strategies, making this injector suitable for regulated markets in North America, Europe, the Middle East, Southeast Asia, Africa, and South America.

Each injector is supplied brand new with a 12-month warranty and expected service life of 5,000–10,000 operating hours under proper maintenance. Recommended installation includes fuel system depressurization, injector bore cleaning, sealing washer replacement, torque-specified tightening, and post-installation coding and calibration to ensure optimal engine response and long-term reliability.