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3116 Fuel Injector 0R-3389 – OEM Quality Mechanical Unit Injector

Engineered for precision and durability, the 0R-3389 Fuel Injector​ is a premium replacement component designed specifically for 3116 and 3126 mechanical engines. This unit injector is meticulously calibrated to restore factory-specified fuel delivery and atomization, ensuring optimal combustion efficiency, reduced emissions, and reliable power output in medium-duty truck and industrial applications.

Product Overview & Direct Interchange

The 0R-3389 is a direct-fit, OEM-compatible mechanical unit injector. It is manufactured with precision-ground components to ensure seamless integration into the 3116 fuel system without requiring electronic recalibration. This unit is supplied as a complete assembly, ready for installation.

Cross-Reference & Interchangeability

This injector is part of 's interchangeable parts family, offering broad compatibility for various 3116 and 3126 engine configurations. The table below lists key interchangeable OEM numbers, ensuring accurate sourcing for fleet maintenance.

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