Cummins 3066738 Injector Nozzle Spring

The Cummins 3066738 is a precision-engineered valve spring designed for the nozzle assembly within Celect electronic unit injectors. It provides the necessary closing force for the injector needle valve, ensuring precise fuel metering and injection timing under high-pressure combustion cycles. This component is manufactured from high-tensile chrome silicon alloy steel, heat-treated and shot-peened to withstand cyclic fatigue and elevated temperatures in heavy-duty diesel applications. It is a critical wear item typically replaced during injector overhaul or rebuild procedures to restore factory pop pressure and spray pattern. Direct OEM replacement for Cummins part number 3066738. Interchanges with aftermarket references including Interstate-McBee M-3066738, Titan CC-3066738, and Vertex SE013417608. Included in injector repair kits such as Redat 1211594. Compatible with Cummins L10, M11, ISM, QSM11, and N14 engine series.