Cummins ISB 6.7 (2011-15) “5566593RX” EGR Cooler

Precision Remanufacturing for the Next-Generation ISB PlatformThe Cummins 5566593RX EGR Cooler is remanufactured by Turbo Kings for 2011–2015 ISB 6.7L engines, ensuring factory-level cooling efficiency and exhaust-gas flow control. Designed for trucks with the later DEF/DPF emissions configuration, this cooler handles higher exhaust temperatures and tighter thermal tolerances than the previous 2007–2010 generation.Each core undergoes complete disassembly and inspection, exposing the internal coolant and exhaust circuits for full restoration. Components are treated in a heated alkaline detergent bath, dissolving hardened soot, oil, and carbon buildup without compromising brazed seams or stainless channels. This stage ensures both exhaust and coolant passages are cleared for unrestricted circulation.Following detergent cleaning, the housing and tubes are immersed in a 48-hour mild acid bath, formulated with a balanced citric- and phosphoric-acid blend. This controlled descaling eliminates internal oxidation and coolant scale — common causes of efficiency loss and clogging under high-mileage conditions. Once descaled, each part is chemically neutralized to halt any residual acidity and prevent flash rusting.If any structural fatigue, porosity, or weld failure is found, our technicians perform precision TIG-weld re-fabricationusing alignment jigs to maintain OEM geometry. Every finished assembly is then pressure-tested to 125 PSI, verifying complete coolant-to-exhaust separation and sealing integrity before final drying and inspection.What Makes a Turbo Kings Rebuild DifferentTurbo Kings applies industrial-grade cleaning chemistry and controlled weld restoration methods rather than surface-level solvent washing. Our aqueous alkaline system penetrates deep into internal channels, clearing soot and coolant residue that standard cleaning cannot remove.The 48-hour acid soak is carefully time-balanced to restore internal stainless without thinning brazed sections. Afterward, each cooler is neutralized, air-purged, and oven-cured, ensuring all internal moisture is removed.Our TIG-weld process reinforces the high-heat zones that typically fail first under sustained load. Combined with 125 PSI submerged validation, this guarantees OEM-grade reliability. Each cooler undergoes a final surface inspection for gasket seating, port alignment, and structural uniformity, ensuring a true bolt-on fit for the Cummins ISB platform.Why Fleets and Owner-Operators Trust Turbo KingsTurbo Kings’ EGR rebuilds are designed for heavy-duty uptime and consistency across multiple service intervals. Every unit is performance-tested to exceed OEM durability in both coolant and exhaust temperature cycling.OEM Fitment Guarantee – Direct replacement for 2011–2015 Cummins ISB 6.7 enginesPressure Tested to 125 PSI – Leak-free validation ensures coolant/exhaust separationCorrosion-Free Finish – Neutralized and oven-cured post-acid treatmentWeld-Reinforced Strength – TIG-repaired joints for long-term enduranceWarranty: 6 Months / Unlimited MileageEach unit is serialized and bench-certified by Turbo Kings technicians before packaging.Our Process at a GlanceDisassembly & Inspection – Identify damage, restriction, or fatigueHot Alkaline Flush – Removes soot, oil, and internal residue48-Hour Acid Descale – Clears oxidation and coolant scaleTIG-Weld Repair – Restores compromised or fatigued jointsPressure Test (125 PSI) – Confirms zero cross-contaminationNeutralization & Oven Drying – Prevents corrosion and moisture retention