Caterpillar original Replacement Diesel Fuel Injector Pencil Nozzle 0R-3422 4W-7018 for CAT 3406 3408 Engine, 0R-3536 4W-7019 for 988B 988F Excavator Wheel Loader original new injector

Built for demanding fuel-system service, the Caterpillar 0R-3422 reman fuel injector nozzle is engineered for heavy-duty diesel engines. Manufactured from hardened alloy steel to an OEM quality standard, it acts as the final fuel metering and atomization device within the injector assembly. High-pressure fuel overcomes spring force, lifts the needle valve and passes through precision nozzle holes before mixing with compressed air. A stable spray pattern supports combustion efficiency, fuel economy, power output, cold starting and reduced smoke emissions.

OE references include 0R-3422/0R3422 and 4W-7018/4W7018, while industry cross references cover 4W-7012, 4W-3619, 5Y-7018 and 0R-1745. Compatibility extends to Caterpillar 3406B, 3406C, 3408, 3408B, 3408C, 3412 and 3412C engines, plus the CAT equipment and generators listed in the application table. This range supports parts procurement for construction, mining, marine, power-generation, petroleum, oil-and-gas, industrial and off-highway operations.

Key industrial features include precision fuel metering, OEM dimensional accuracy, high-temperature resistance, wear resistance and long operational life. For installation, use clean fuel, replace damaged seals, prevent contamination, verify injector calibration and follow Caterpillar service-manual procedures. Ongoing maintenance should include premium diesel, regular fuel-filter replacement, fuel-cleanliness control, exhaust-smoke monitoring and injector performance testing. Diagnosis can combine opening-pressure and injector-balance tests with leakage inspection, nozzle-hole examination, spray-pattern evaluation and combustion analysis.