Caterpillar original Fuel Injector C4.4 C6.6 Engine Parts 2645A746, Cross Reference 10R-7971, Replacement for OEM 321-3600, Common Rail Fuel Injector 320-0690 for Construction original new injector

The CAT 2645A746 is a brand-new diesel common rail fuel injector built as an OEM-equivalent replacement for Caterpillar C6 series engines, with cross references 326-1643 and 3261643. It fits CAT C6, C6.4, C6.6 and C6 ACERT industrial and generator engines, and supports heavy-duty equipment across construction, mining, agricultural, marine and power generation sectors, including excavators, loaders, bulldozers, generator sets and stationary power units. Manufactured to strict OEM specifications, it ensures consistent fit and performance for professional maintenance operations.

As a core common rail system component, this injector receives engine control module (ECM) signals to deliver precisely metered high-pressure fuel at calibrated timings. Its precision nozzle atomizes fuel into uniform droplets to support pilot, main and post injection cycles, improving combustion efficiency, boosting power output, cutting fuel consumption, lowering emissions, reducing engine noise and enhancing cold-start performance. These benefits help operators meet performance targets while lowering long-term operational costs.

Engineered for harsh heavy-duty conditions, the 2645A746 is made from heat-treated high-strength alloy steel with protective surface treatment, resisting extreme pressures, temperatures, vibration and corrosion. Its micron-tolerance CNC-machined parts enable extended service intervals and reduced unplanned downtime, and it comes with a 12-month warranty for B2B buyers, supporting stable engine performance and jobsite productivity.