Caterpillar original Diesel Fuel Injector Common Rail for C7 C9 Engine, Replacement for OEM 387-9439 20R-8061 557-7634 172-5780 293-4071 387-9484 236-0957 293-4072 original new injector

The 387-9439 HEUI injector GP is engineered as a direct replacement for Caterpillar C9 and C9 ACERT industrial diesel engines. Designed for the 8.8 L inline six-cylinder platform with turbocharged aftercooled configuration, it delivers precise fuel metering, accurate injection timing, and fine atomization through electronically controlled high-pressure actuation. Each unit maintains the correct spray pattern and balanced cylinder-to-cylinder fuel delivery, restoring original combustion stability in heavy-duty operating environments.

This injector fits a wide range of Caterpillar equipment, including 330D, 330D L, 336D, and 336D L excavators, D6R and D7R bulldozers, 140M and 160M motor graders, 814F Series 2 wheel dozers, 815F Series 2 soil compactors, 816F Series 2 landfill compactors, generator sets, marine auxiliary engines, and other C9-powered industrial machinery. It serves construction, mining, power generation, marine, and agricultural sectors, and is supported through global aftermarket distribution.

The injector addresses common problems such as hard starting, rough idle, power loss, misfire, excessive smoke, high fuel consumption, and ECM injector fault codes. Supply options include new aftermarket, remanufactured, rebuilt, exchange, and OEM equivalent units, all backed by strict quality control. Built to original-type specifications, the 387-9439 offers reliable performance restoration and reduced downtime for demanding C9 engine applications.