Caterpillar original Common Rail Diesel Fuel Injector for C9.3 Engine 320E 323E 950K Excavator Loader, Replacement for OEM 10R-1267 20R-1318 20R-5073 155-1819 new original new injector

The Caterpillar CAT C9.3 diesel fuel injector 10R-1267 is a common rail injection assembly engineered to restore original engine performance in demanding industrial and heavy equipment applications. As a direct OE replacement, it controls injection timing, regulates fuel pressure, and delivers precise atomized fuel into the combustion chamber, supporting stable idle, consistent power output, and reduced exhaust smoke across C9.3, C9.3 ACERT, excavator, power unit, and compatible industrial C9.3 engine variants.

Built for heavy-duty service environments, the 10R-1267 injector features a robust cylinder head mounted design with seal and O-ring compatibility matched to the Caterpillar common rail fuel system. It works to recover engine performance affected by misfire, rough running, overfueling, or poor combustion, while also helping protect the engine from internal damage. Cross references including 232-1171, 456-3545, 456-3589, 20R-5073, 417-3013, 232-1173, 173-9272, 173-9379, 363-0493, 342-5487, 304-3637, 9X-7681, 250-0466, 116-7221, 116-7222, and 230-0940 ensure broad fitment coverage for distributors, engine rebuilders, and fleet maintenance operations worldwide.

For installation, technicians should verify the part number, engine model, serial number, arrangement number, and original injector number before fitting. Clean the injector bore, replace seals and O-rings, inspect the fuel line, follow Caterpillar service manual torque values, prime the fuel system, check for leaks, clear diagnostic codes, and confirm performance under both idle and load conditions. Using clean diesel, scheduled fuel filter replacement, and water separator draining will further support long service life.