Cummins 327963700 Injector Nozzle Cup

The Cummins 327963700 injector nozzle cup, also referred to as the injector sleeve or cup, serves as a critical interface between the fuel injector and the cylinder head in the fuel system. This SAC (Small Angle Conical) type cup ensures accurate alignment and sealing of the injector nozzle tip, preventing combustion gas leakage and ensuring proper fuel atomization. Manufactured to Cummins OEM specifications, this component is typically constructed from heat-treated alloy steel to withstand high combustion temperatures and pressures encountered in heavy-duty diesel engines. It is a non-serviceable wear item typically replaced during injector overhaul or cylinder head rebuilds to maintain fuel system integrity and emission compliance.