The inspection casing K 66145 is a service-access component designed for the charge air cooler housing K 66102 in the Sulzer ZV40/48 engine. Its main purpose is to provide convenient access for inspection, maintenance, and cleaning of internal cooler components without requiring major disassembly of the air charging system. Manufactured from high-strength and corrosion-resistant materials, the inspection casing is engineered to operate reliably under elevated pressure, vibration, and thermal loading conditions typical of heavy-duty diesel engines. Precision-machined mounting and sealing surfaces ensure secure closure and maintain airtight system performance during operation. Its robust construction supports repeated opening and closing during maintenance procedures while preserving structural integrity. By enabling efficient service access and supporting proper maintenance of the charge air cooler, the K 66145 inspection casing contributes to stable engine performance, optimized cooling efficiency, and long-term reliability of the air charging system.