Cummins 526331500 Fuel Injector Assembly

The Cummins 526331500 is a PT (Pressure-Time) type fuel injector engineered for the K19 and KTA19 series heavy-duty diesel engines. It utilizes a mechanical actuation mechanism driven by the engine camshaft via a pushrod and rocker lever assembly. The injector meters and atomizes fuel directly into the combustion chamber based on the PT fuel system logic, where fuel quantity is determined by the pressure at the injector inlet and the time the metering orifice is open. This component features a multi-hole nozzle spray tip calibrated for specific combustion bowl geometry in KTA19 applications, including the KTA19-M3 500HP marine rating. The injector body is constructed from high-strength alloy steel to withstand high cyclic combustion pressures and fuel system pressures exceeding 1,000 bar at the nozzle tip. It is a direct replacement for Cummins OEM part numbers 526331500, 526331500PX, and 5263315PX. Installation requires setting the injector plunger travel (lash) to factory specifications using a dial indicator to ensure correct fuel delivery timing and quantity.