Caterpillar original  250-1302 10R-9617 392-0202 Common Rail Diesel Fuel Injector for C3500B 3512B 3516B Engine 797 793C 789C 793D Excavator original new injector

The Caterpillar 250-1302 fuel injector is a precision-engineered electronic unit injector designed for CAT 3512B diesel engines and compatible platforms including the 3512, 3516B, 3516, 3508B, and 3508. Manufactured to OEM equivalent standards, this injector assembly delivers accurate fuel metering through a precision-machined nozzle and OEM calibrated fuel delivery, ensuring consistent atomization at high injection pressures. Its heavy-duty industrial design and corrosion-resistant construction provide a long operational lifespan even in the harsh environments typical of marine propulsion systems, offshore power modules, and oilfield equipment.

This CAT fuel injector 250-1302 is widely deployed across power generation generator sets, marine propulsion systems, mining haul systems, oil and gas equipment, industrial compressors, and other heavy industrial machinery. Cross-referenced with part numbers 10R0957 and 20R2057, the injector supports reliable combustion in utility power plants, emergency backup generators, offshore platforms, fracturing equipment, tugboats, cargo vessels, and drilling systems. Each unit is engineered for stable combustion performance, enhanced cold start behavior, and reduced particulate emissions.

Routine maintenance best practices include using clean diesel fuel, replacing fuel filters at recommended intervals, monitoring exhaust smoke, checking cylinder balance, and performing injector calibration testing. Common diagnostic indicators such as black exhaust smoke, engine power reduction, and excessive fuel consumption are often linked to nozzle wear, carbon deposits, restricted fuel flow, internal injector wear, or incorrect calibration. Operators should always verify compatibility using the engine serial number and injector part number before ordering to ensure correct fitment and sustained engine performance.