Caterpillar original 0R-3591 Fuel Injector Nozzle for Excavator Construction Machinery, fits Engines, Replacement for OEM 170-5181, compatible with Excavator, also fits 7W-7045 original new injector

Built around precise fuel metering and atomization, the CAT 0R-3591 fuel injector nozzle assembly is an OEM-equivalent diesel fuel injection component for Caterpillar engines in demanding industrial service. It receives pressurized fuel, regulates injection timing and quantity through internal precision components, and atomizes fuel through micron-level nozzle orifices. This process supports efficient air-fuel mixing, stable fuel delivery, improved combustion efficiency, enhanced engine performance and reduced exhaust emissions.

Compatibility includes Caterpillar 3406B, 3406C, 3406E, C15 and C16 engine families, together with Caterpillar industrial diesel and generator set engines. Equipment coverage extends to excavators, mining trucks, wheel loaders, bulldozers, generator sets, marine propulsion systems, industrial power units and construction machinery. The assembly therefore serves maintenance and parts-supply requirements across construction, mining, marine, agriculture, oil and gas, power generation and transportation applications.

Precision-engineered nozzle holes, industrial-grade metallurgy and wear resistance support durability under high temperatures, high fuel pressures and continuous-duty workloads. OEM installation compatibility, 100% performance testing, a 12-month warranty and neutral or customized packaging add value for B2B buyers. During installation, clean the seating area, replace sealing washers and O-rings, inspect fuel lines and follow Caterpillar torque specifications. Clean diesel fuel, regular filter replacement and water-separator draining help maintain reliable operation and reduce avoidable downtime.