Caterpillar original Fuel Injector 0R-1743 for CAT 3406B 3406C 3408C 3408 Cross Reference 0R-8787, Replacement for OEM 0R-3420, Excavator Engine Injector Diesel Part with 0R-1744 original new injector

Built for the final stage of diesel fuel metering, the Caterpillar 0R-1743 Injector Nozzle Assembly (0R1743) is a NOZZLE AS-RE component for heavy-duty Caterpillar fuel systems. Manufactured according to Caterpillar fuel system standards, it is designed for high-pressure injection conditions and applications across construction, mining, marine, oil and gas, transportation, agriculture, industrial manufacturing, and power generation. Listed engine references include CAT 3406, 3406B, 3406C, and 3406E; compatibility should be confirmed by engine serial number and injector specification.

Within the injection process, high-pressure fuel enters the injector body and lifts the nozzle needle. Fuel then passes through precision-machined spray holes, atomizing into microscopic droplets that mix with compressed air in the combustion chamber. Immediate needle-valve closure helps prevent fuel leakage after injection. By controlling fuel atomization, spray-pattern formation, and injection-timing characteristics, the nozzle supports stable fuel delivery, combustion efficiency, fuel economy, engine performance, reduced smoke, lower exhaust emissions, and improved cold-start performance.

Industrial-grade features include OEM-quality manufacturing, micron-level machining accuracy, high injection consistency, a stable spray pattern, extended service life, low failure rate, and heavy-duty performance. For service, clean the injector bore, verify the seating surface, install new sealing components, tighten to OEM torque requirements, bleed the fuel system, and inspect for leaks. Related Caterpillar reference numbers support database research only and do not confirm interchangeability; verify the required nozzle before ordering.