Caterpillar original Fuel Injection Pump Plunger Cross Reference 4P9830, 1086633, 1P6400 Replacement for Diesel Engine Rebuild Kit for 3306 3406 3408 3412 3412C Excavator Loader original new injector

The CAT 1P6400 plunger-type diesel fuel injector is an OEM-specification fuel injection component designed for heavy-duty Caterpillar diesel engine applications. With a cross reference number of 1P-6400, it is compatible with CAT 3208, 3304, and 3306 engines across industrial, marine, and power generation configurations. It supports direct replacement of original worn injectors without extra modification, delivering consistent fit and function aligned with original equipment requirements.

Constructed from high-strength alloy steel with precision-ground plunger and barrel assemblies and hardened wear-resistant internal parts, the 1P6400 injector delivers precise fuel metering and optimized atomization for stable, efficient combustion. Its industrial-grade design provides reliable high-pressure performance, heat resistance, corrosion protection, and long service life in severe operating conditions, while reducing fuel consumption, exhaust emissions, and supporting steady engine power output.

This versatile component is suitable for a wide range of equipment across construction, mining, marine, agriculture, and power generation sectors, including excavators, wheel loaders, bulldozers, mining trucks, generator sets, and marine propulsion systems. Following Caterpillar’s official installation procedures and recommended maintenance practices ensures sustained reliable performance, making it a dependable choice for engine rebuild and heavy equipment maintenance operations.