Caterpillar original 0R-3419 Diesel Fuel Injector Common Rail Pencil Nozzle for 3204 3400 Engine Replacement for OEM 4W7015 4W7018 0R1742 Later original new injector

The Caterpillar 0R-3419 fuel injection nozzle is an OEM reman replacement engineered for the 3204 4-cylinder industrial diesel engine platform, covering naturally aspirated, turbocharged, generator set, and marine configurations. It cross-references with 4W-7015, 1W-3995, 8N-7004, 1W-1354, 1W-4105, 2W-4387, and 7W-7015, ensuring broad compatibility across track loaders, wheel loaders, track type tractors, integrated tool carriers, excavators, backhoe loaders, and wheel skidders used in construction, mining, marine, and stationary power applications.

Manufactured to OEM-level precision, the nozzle features micron-level orifice machining and a calibrated opening pressure that matches CAT 3204 specifications. The heat-treated alloy steel body, wear-resistant needle and seat, and corrosion-resistant surface treatment deliver long service life under high-temperature and high-load operation. An optimized spray pattern promotes uniform fuel atomization, reducing carbon buildup, improving fuel economy, and enhancing overall engine response.

Operation follows a precise sequence: fuel pressurization raises line pressure until it overcomes the calibrated spring force, lifting the needle valve to inject atomized fuel through micro-orifices for efficient combustion, after which the needle reseats to prevent dribble. The unit is remanufacturing compatible and fits Caterpillar Reman rebuild workflows. For dependable service, operators should use clean diesel with OEM-grade filtration, inspect nozzles every 2,000–3,000 hours, verify opening pressure on a calibrated injector test bench, and follow correct torque and lubrication procedures during installation.