Caterpillar original 0R-3420 Pencil Fuel Injector Diesel Injector Nozzle for CAT 3208 Engine, Replacement for OEM, Cross Reference 0R-1743, 4W-7016 original new injector

For fuel-system distributors, injector rebuilders, and heavy-equipment maintenance teams, the CAT 0R-3420 injector nozzle provides an OEM-equivalent replacement option for diesel fuel injection programs. Also listed as 0R3420, it is designed to support accurate fuel atomization as the final precision component in the injection cycle. Its role in spray formation can influence combustion efficiency, power output, fuel economy, emissions performance, starting capability, and engine smoothness.

The nozzle is made from high-strength alloy steel and manufactured with CNC machining and precision grinding. This approach supports consistent spray patterns, stable injection pressure characteristics, wear resistance, and long service life under demanding high-pressure conditions. Protective surface treatments help limit corrosion associated with fuel contaminants and operating environments. These characteristics make the component suitable for OEM fuel injector rebuilding programs, remanufactured injector assemblies, and preventive maintenance schedules.

Compatibility references include Caterpillar C7, C9, and C10 diesel engines, with equipment applications spanning construction, mining, power generation, marine, and industrial machinery. Cross-reference listings cover 10R-3420, 7W-3420, and 3R-3420, together with their unhyphenated formats. Because references can vary by engine arrangement, injector assembly, regional catalog, remanufacturing program, and fuel-system configuration, buyers should confirm fitment using the engine serial number and injector assembly number before ordering.