Cummins 3087587 Fuel Injector Assembly

The Cummins 3087587 is a PT (Pressure-Time) fuel injector with STC (Step Timing Control) capability, engineered for the Cummins K19, K38, and K50 large-bore diesel engine platforms. It utilizes a mechanically actuated, hydraulically controlled injection principle with a solenoid valve for injection timing modulation on QSK19 and marine variants. The injector body is manufactured from high-strength alloy steel with precision-machined internal passages to withstand peak firing pressures exceeding 140 MPa. The nozzle assembly features a multi-hole spray tip (typically 7-hole x 0.25mm configuration for K19) calibrated for specific combustion bowl geometry. This part serves as a direct OEM replacement for Chongqing Cummins (CCEC) produced engines including KTA19-C, KTTA19-C, KTA38-C, KTA50-C, and marine ratings KTA19-M3, KTA38-M, KTA50-M. The injector incorporates a replaceable nozzle valve set (needle and seat) and a lower O-ring seal kit for maintenance. It interfaces with the PT fuel pump (e.g., PTG-AFC, PTG-EFC) via high-pressure fuel lines. Installation requires torque specification of 60-70 Nm for the injector hold-down clamp and verification of injector protrusion depth. Cross-referenced supersession includes part numbers 3095773, 3076702, and 3077716 for specific calibration codes. This component is critical for fuel metering accuracy, emissions compliance (IMO Tier II / EPA Tier 2 equivalent), and cold-start performance in heavy-duty mining haul trucks and stationary power generation.