Caterpillar original  20R-8066 Engine Fuel Injector for C7 Excavator E320D E330D E324D E325D E329D 387-9427 295-1412 10R-7225 Replacement for OEM original new injector

Engineered for heavy-duty diesel service, the 20R-8066 fuel injector assembly is a precision-built component designed to restore full performance in C7 powered machines. This injector delivers accurate high-pressure fuel metering and fine atomization, supporting stable idle, stronger load response, cleaner combustion, and lower exhaust smoke. It is manufactured to OE replacement quality and is widely used by fleet operators, remanufacturers, and international parts distributors serving construction, mining, marine auxiliary, and power generation markets.

The 20R-8066 injector is commonly fitted to 324D, 325D, 325D L, 329D, and 329D LN excavators, M325D MH material handlers, and 950H wheel loaders, as well as C7-based industrial power units and transport engines. Verified cross references include 20R-9079, 387-9427, 263-8218, 268-1835, 295-1411, 10R-7225, 557-7627, 20R-1926, 10R-4762, 20R-1260, AP63948, 19KP364, and NSN 2910-01-545-8117. Buyers should confirm the original injector part number and engine serial number before ordering, since C7 engines may use different fuel system, emissions, and calibration configurations.

For reliable service life, use clean diesel fuel, replace fuel filters on schedule, drain the water separator, and maintain proper engine oil condition. Symptoms such as hard starting, misfire, black or white smoke, fuel knock, or low power should be diagnosed with return flow testing, cylinder cut-out testing, injector balance testing, and ECM fault-code scanning. Store replacement injectors in sealed packaging to prevent contamination.