Detroit Diesel DD15 (2015-20) “A4731400575 ” EGR Cooler

Precision Remanufacturing for Next-Generation DD15 EnginesEach Detroit Diesel A4731400575 EGR Cooler is remanufactured in-house by Turbo Kings using a disciplined, OEM-level process that restores factory cooling efficiency and flow performance for 2015–2020 DD15 applications. Every core is completely disassembled and inspected to identify cracks, distortion, or carbon restriction.Components are first treated in a heated alkaline detergent bath, dissolving baked-on soot, oil, and sludge without harming stainless or brazed joints. This deep-cleaning stage clears both coolant and exhaust paths, ensuring unrestricted circulation and maximum thermal transfer.After the detergent stage, the housing is immersed in a 48-hour mild acid bath containing a balanced citric- and phosphoric-acid solution. This controlled descaling removes oxidation, mineral deposits, and rust scale that commonly form in high-mileage units. The result is a fully restored internal surface ready for extended service life.When any structural fatigue or hairline cracking is detected, Turbo Kings technicians perform precision TIG-weld re-fabrication using matching filler alloy and dedicated alignment jigs. These fixtures preserve OEM geometry so the unit seats perfectly against factory gaskets during re-installation.Once repairs are complete, every EGR cooler undergoes a 125 PSI submerged pressure test to confirm absolute separation between coolant and exhaust circuits. Only coolers that pass this validation move on to neutralization, rinse, and oven drying—guaranteeing a clean, moisture-free assembly ready for installation.What Makes a Turbo Kings Rebuild DifferentTurbo Kings remanufactures every DD-series EGR cooler using industrial-grade chemistry and precision fixtures—not quick surface washing. Our aqueous alkaline cleaning penetrates deeper than solvent rinses, removing carbon contamination that can trigger overheating or EGR flow faults.The 48-hour acid stage is time-controlled to protect internal coatings and weld seams while fully eliminating mineral scale. Each cooler is then neutralized and oven-cured to prevent flash corrosion and trapped moisture.Our TIG-weld repairs are executed under temperature-controlled conditions that ensure uniform penetration and zero porosity. Combined with high-pressure validation, this guarantees OEM-level structural integrity across every unit. Before packaging, technicians perform a detailed inspection of sealing flanges, port alignment, and surface flatness to ensure a perfect bolt-on fit.Why Fleets and Owner-Operators Trust Turbo KingsFleet operators depend on uptime and repeatable quality—two things Turbo Kings builds into every component.OEM Fitment Guarantee – Direct bolt-on replacement for 2015–2020 DD15 enginesPressure Tested to 125 PSI – Confirms leak-free coolant/exhaust separationCorrosion-Free Finish – Neutralized and oven-cured after descalingWeld-Reinforced Reliability – TIG-repaired for high-heat enduranceWarranty: 6 Months / Unlimited MileageEvery Turbo Kings EGR cooler is documented, tested, and certified for heavy-duty service before leaving our facility.Our Process at a GlanceDisassembly & Inspection – Identify cracks, warping, and restrictionHot Alkaline Flush – Removes oil, soot, and internal debris48-Hour Acid Descale – Clears oxidation and coolant scaleTIG-Weld Repair – Rebuilds damaged or fatigued jointsPressure Test (125 PSI) – Submerged validation for cross-leaksNeutralization & Oven Drying – Ensures corrosion-free internals