Caterpillar original Diesel Engine Common Rail Fuel Injector 212-3463 C10 C12 317-5278 Replacement for OEM 194-5080, 223-5328 for Caterpillar Excavator original new injector

The 317-5278 (also formatted as 3175278) is an OE-style heavy-duty common rail diesel fuel injector developed as a replacement for Caterpillar engine platforms, with the C13 series as its primary application. It is also commonly cataloged for Caterpillar C10, C11, C12, and 3176C diesel engines, and supports heavy equipment across construction, earthmoving, road building, mining, and industrial sectors. Available in single units, 6-piece engine sets, and bulk wholesale quantities, it caters to repair shops, fleet maintenance teams, machinery dealers, contractors, mining operators, and spare parts distributors.

Precision-engineered to deliver accurately metered diesel fuel into the combustion chamber under controlled pressure and timing, the injector directly influences critical engine performance indicators: fuel atomization, combustion efficiency, exhaust smoke output, starting performance, power delivery, fuel economy, and long-term operational reliability. A correctly matched 317-5278 unit supports consistent, balanced fuel delivery across all engine cylinders to maintain intended C13 and compatible platform operation.

Worn, leaking, blocked, or poorly atomizing injectors trigger issues including hard starting, rough idle, excessive smoke, high fuel consumption, power loss, misfires, abnormal vibration, elevated exhaust temperatures, piston damage, fuel dilution in engine oil, and increased emissions, making timely replacement critical. All buyers must verify fitment via engine serial number, removed injector part number, official parts manual, ECM calibration, and equipment arrangement number before purchase or installation to avoid mismatched parts.