Solenoid Cap – Cummins XPI Series Type II | Fits 21 Injector Models (4307452, 4359204, 5594305, Etc.)

The Cummins XPI Series Type II Solenoid Cap is a precision-engineered retention component designed specifically for high-pressure common rail fuel injectors used in heavy-duty diesel applications. This critical part secures the solenoid armature assembly within the injector body, maintaining consistent clamping force and precise stroke clearances under extreme operating pressures and thermal cycling. As a direct-fit replacement, this cap supports an extensive range of Cummins XPI injector part numbers-including 4307452, 4359204, 5594305, 5572336, 4327072, 2872331, 2872765, 2897414, 5579401, 2872075, 5579403, 2872127, 5579405, 5579407, 2872068, 5579409, 5579411, 2872621, 5579413, and 4307045-making it an indispensable inventory item for diesel repair facilities and aftermarket parts distributors serving North American and European fleets.

The Type II solenoid cap is manufactured to exacting tolerances that directly govern injector performance and longevity. Physical specifications include an overall length of 15.9 mm with an outer diameter of 6.9 mm, featuring a slot width of 4.7 mm and slot depth of 2.4 mm engineered for correct tool engagement during service procedures. This component interfaces precisely with the solenoid valve stack to ensure proper positioning of the armature core and calibration shims that determine injection timing and fuel quantity. The factory-specified tightening torque ranges from 13–25 N·m, with an optimal working window of 17–19 N·m-exceeding or falling below this range risks thread deformation that alters clamping force dynamics, leading to injector instability, erratic operation, and premature component failure. For workshops performing injector overhauls, verifying cap integrity, thread condition, and dimensional accuracy is non-negotiable, as even minor deviations can compromise the entire fuel injection system and trigger costly engine performance issues.

This solenoid cap is purpose-engineered for Cummins XPI fuel systems found across the ISX and X15 engine families, including ISX12, ISX15, and QSX variants certified for EPA13 and later emissions standards. The component supports a broad cross-section of injector models frequently encountered in fleet maintenance, dealership service bays, and remanufacturing operations. Compatible injectors include 4307452 (used in ISL8.3 and ISL9.5 applications), 4359204, 5594305, 5572336, 4327072, the extensive 2872xxx series, and the 55794xx family-each representing high-volume service items in the heavy-duty aftermarket. This comprehensive compatibility makes the Type II cap an essential stocking unit for diesel parts suppliers supporting Freightliner, Kenworth, and Peterbilt trucks, along with off-highway construction and mining equipment utilizing these engine platforms. The cap's role in maintaining injector alignment within the cylinder head directly impacts combustion stability, fuel atomization quality, and overall emissions compliance, which are increasingly critical under stringent regulatory frameworks.

Proper installation of the XPI solenoid cap requires meticulous attention to torque application, thread condition, and component cleanliness. Service literature consistently emphasizes that the cap's slot must engage with the correct installation tool to avoid distortion or damage during tightening. Thread damage-frequently caused by over-torquing, cross-threading, or using worn tools-will permanently alter the clamping force exerted on the valve assembly, leading to micro-movement that degrades sealing integrity and injector performance over time. For workshops rebuilding injectors in-house, the recommended procedure involves thoroughly cleaning all threads and seating surfaces with appropriate solvents, inspecting the cap for stress fractures or wear patterns, then applying torque incrementally using a calibrated wrench to reach the 17–19 N·m sweet spot. This precision is non-negotiable because the cap positions the solenoid valve spring and determines the armature lift-typically factory-set to 50μm during calibration. Any deviation from this specification affects injection volume and timing accuracy, with downstream consequences for fuel economy, power output, and emissions performance that can trigger diagnostic trouble codes and failed compliance tests.

Q1: How do I confirm fitment for my injector? A: Cross-reference your injector P/N against the table above. This cap fits all 21 listed models, including 4307452, 4359204, 55794xx, and 2872xxx variants.

Q2: Can I reuse the solenoid cap during rebuilds? A: We strongly recommend replacement. Repeated torque cycling and thermal stress cause thread wear and micro-cracking. A new cap eliminates clamping force degradation-a leading cause of injector failure.

Q3: What torque spec should technicians follow? A: Apply 17–19 N·m using a calibrated torque wrench and correct slot tool. Over-torquing deforms threads; under-torquing allows movement-both compromise injector performance.

Q4: What symptoms indicate a failing cap? A: Rough idle, reduced power, increased fuel consumption, and hard starting (especially warm) typically trace to altered armature lift affecting injection timing and quantity.

Q5: Does this cap work for both new builds and remanufacturing? A: Yes. It meets or exceeds OE specifications for dimensional accuracy and material strength, suitable for new assemblies and high-quality reman programs.

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