Caterpillar original 2645A746 Fuel Injector 320-0677 320-0680 10R-7971 for C4.4 C6.6 420E 430E 450E E320D Excavator Engine Parts new injector original new injector

The Caterpillar C6 Series Fuel Injector 2645A746 is a precision-engineered OEM replacement component designed for Caterpillar C6, C6.4, C6.4 ACERT, C6.6, and C6 ACERT industrial and generator diesel engines. Manufactured to OEM dimensional and performance standards with CNC-machined components, this injector delivers micron-level tolerances, superior atomization, and high-pressure resistance suitable for common rail fuel pressures up to 1,800 bar. It cross-references with 326-1643, providing a direct fitment solution for heavy-duty applications. Built from high-strength alloy steel with heat-treated internals and a corrosion-resistant protective surface, the 2645A746 offers extended service life, typically 5,000 to 10,000 operating hours under proper maintenance conditions.

This electronically controlled injector supports pilot, main, and post injection strategies, enhancing combustion efficiency, reducing fuel consumption, lowering particulate emissions, and improving cold-start performance. Emission compliance supports Tier 3, Tier 4, and equivalent standards, making the injector suitable for global markets including North America, Europe, the Middle East, Southeast Asia, Africa, and South America. Each unit undergoes strict quality control and is supplied in export standard packaging to preserve integrity during international shipping.

The 2645A746 serves a wide range of equipment, including excavators, wheel loaders, bulldozers, construction and mining machinery, industrial generator sets, agricultural machinery, marine applications, oil and gas equipment, and stationary power units. Pre-installation inspection should verify the injector part number, fuel line condition, injector bore cleanliness, cylinder head condition, and electrical connector integrity. Installation requires depressurizing the fuel system, replacing the sealing washer, tightening to Caterpillar specifications, and performing injector coding or calibration where required by the engine ECM configuration.