Cummins 3018814 Injector Cup Assembly

The Cummins 3018814 injector cup, also identified as an injector sleeve or tube, is a critical component within the PT (Pressure-Time) fuel injection system. It is press-fitted into the cylinder head to provide a precision bore for the fuel injector, ensuring proper alignment and sealing of the combustion chamber from the fuel gallery. Manufactured from hardened stainless steel or equivalent tool-grade alloy, the cup withstands high combustion temperatures and fuel pressure cycles. It features a precision ground internal diameter and external sealing surfaces to prevent fuel dilution of engine oil and compression loss. This part is a direct replacement for Cummins OEM part number 3018814 and cross-references CUM3018814. Primary application covers heavy-duty diesel engines utilizing the PT fuel system, specifically the NT855 (Big Cam), N14, V28, K19, K38, K50, M11, and L10 engine families. It is widely deployed in construction machinery platforms powered by these engines, including hydraulic excavators, wheel loaders, and motor graders from major Chinese OEMs.