Caterpillar original Caterpillar original Caterpillar 104-3377 Diesel Common Rail Fuel Injector 0R-8786 156-3895 173-9267 191-3005 232-1166 for 3412 3408 Engine Sprayer original new injector

The Caterpillar 3412 Series Fuel Injector 104-3377 is a precision-engineered diesel fuel injector designed specifically for CAT 3412, 3412B, and 3412C engines, covering an output range of 1500–2500 RPM. As an OEM-quality replacement part, it provides direct-fit compatibility with part numbers 104-3377, 0R-43377, 1043377A, 317-43377, 1043377B, and 8N-43377. Industrial-grade manufacturing combined with high-precision components ensures consistent fuel atomization, which directly supports efficient combustion and stable engine performance across a wide operating range.

Built with durable construction and precision-tested internals, this injector delivers long-term reliability in high-stress environments including excavators such as the Caterpillar 345B, generator sets including the Caterpillar D350 and D360, industrial pumps covering the P100 and P200 series, and Caterpillar Marine 3412 Series propulsion engines. It is engineered to meet international diesel engine standards, with each unit validated for consistent spray pattern and flow rate across operating temperatures of 35–40°C ambient baseline.

Routine maintenance intervals of every 000–10 hours are recommended to sustain optimal performance. Operators should inspect injector spray patterns using diagnostic equipment, clean fuel filters regularly, ensure fuel supply is free from contamination, and use only certified diesel fuel meeting ASTM D975 or equivalent standards. Worn seals and gaskets should be replaced as needed. In the event of hard starting, poor fuel economy, excessive smoke, or engine misfire, the injector should be cleaned, tested, or replaced to restore original performance specifications.