Caterpillar original 418-8820 Diesel Injector Common Rail Fuel Injector Assy Replacement for OEM 3116 3114 E320B E322B Excavator Diesel Car Parts original new injector

The Caterpillar CAT 418-8820 unit injection pump group is engineered for the CAT 3116 series diesel engine, delivering precise metering and high-pressure fuel injection into each cylinder. It supports reliable cold starting, stable idle behavior, balanced power output and cleaner combustion across demanding industrial and heavy equipment operating conditions. Built with heavy-duty internal components, the injector is designed as a direct OE-style replacement that matches original flow rate, spray pattern and dimensional fitment.

This injector cross-references an extensive database of Caterpillar numbers, including 20R-4179, 224-9090, 184-2527, 137-4729, 7E-5645, 7C-3854, 6I-4401, 20R-1923, 10R-1252, 0R-8575, 0R-3815, 0R-6130, 0R-5510 and 0R-0471, giving diesel workshops, engine rebuilders, fleet maintenance teams and parts distributors strong database searchability for parts identification and inventory management. Compatibility with specific 3116 engine models and serial ranges must always be confirmed by part number, engine serial number, arrangement number and the existing injector number before installation.

Injector life depends on clean fuel, proper filtration, water separation, correct handling and correct installation. Common symptoms of a worn or failed unit injector include hard starting, long cranking, rough idle, misfire, black or white smoke, knocking, power loss, high fuel consumption, external leakage and elevated exhaust temperature. Before installation, operators should confirm the injector number and engine data, clean the work area, inspect the injector bore, replace required seals, follow the Caterpillar service manual, bleed the fuel system and inspect for leakage after starting. Professional installation is strongly recommended.