original 4W7018 Pencil Fuel Injector Nozzle 0R-3422 8N-7005 OR3422 4W-7018 for 3406B 3408 3408C 3412 3304 3306 Diesel Engine Excavator Parts Replacement original new injector

Engineered as a direct OEM equivalent replacement, the 4W7018 Fuel Injector Nozzle delivers precise diesel atomization and dependable service life for heavy-duty engine platforms. Cross referenced as 4W-7018, this injection nozzle is manufactured from heat-treated alloy steel and finished through precision CNC machining to meet demanding fuel system tolerances. It is a critical spare part for 3304, 3306, and 3406 series industrial, marine, and generator set diesel engines used across construction, mining, and power generation sectors.

The nozzle features a precision ground needle valve, high pressure fuel capability, and an optimized spray pattern that improves fuel atomization and combustion efficiency. Operational benefits include enhanced fuel economy, stable engine operation, reduced exhaust emissions, and improved cold-start performance. Excellent wear resistance and integrated corrosion protection extend service intervals in dusty, humid, and high-load working environments typical of excavators, wheel loaders, bulldozers, motor graders, mining trucks, marine propulsion units, and stationary industrial power systems.

For maximum reliability, install the 4W7018 nozzle using clean fuel system components, verify injector opening pressure, and follow service manual specifications; bench testing is recommended prior to fitment. Best-practice maintenance includes using clean diesel fuel, replacing filters on schedule, preventing water contamination, monitoring injector balance, and performing periodic fuel system inspections. Troubleshooting covers tip inspection, spray pattern evaluation, opening pressure measurement, needle valve wear check, leak-down testing, and fuel contamination analysis. Backed by a 12-month warranty.