original 254-4330 Diesel Engine Rail Fuel Injector for C9 Excavator 387-9434 10R7222 20R-8060 Replacement for OEM new injector original new injector

The C9 HEUI fuel injector 254-4330 is a direct replacement component designed specifically for the C9 and C9 ACERT diesel engine, an inline 6-cylinder power unit with a displacement of approximately 8.8 liters and well-service ratings around 205-280 bkW / 205-375 bhp at 2200 rpm, depending on the engine configuration. It is widely applied in 330D, 336D, 336D L, and 340D excavators, and is also used in industrial and oilfield equipment such as pump skids, cementing units, coil tubing units, workover rigs, and hydraulic power units, making it a reliable match for the C9 engine family across multiple working environments.

As a Hydraulic Electronic Unit Injector, this assembly works in coordination with the engine's ECM-controlled timing and fuel delivery, using high-pressure engine oil to actuate the injection process. Precision fuel metering helps restore engine power, fuel economy, idle quality, and throttle response, while correct spray atomization reduces black smoke, rough running, and incomplete combustion. Each injector is tested for leakage, solenoid response, spray pattern, flow delivery, sealing, and return flow to meet original standard performance.

For maintenance, clean diesel fuel, regular fuel filter replacement, water separator draining, and proper engine oil service are critical in HEUI systems because high-pressure oil drives injector actuation. Before installing a new injector, fuel lines should be flushed and fuel filters replaced. Common signs of injector failure include hard starting, rough idle, black or white smoke, misfire, low power, high fuel consumption, knocking, excessive return fuel, and diagnostic trouble codes. Authorized cross references include 254-4339, 254-4340, 2544330, 2544339, 2544340, and CA2544330. Available as single piece, 6-piece engine set, or bulk order with export-ready packaging.