Caterpillar 126-5923 Cylinder Block Assembly

The Caterpillar 126-5923 cylinder block assembly serves as the foundation for the 3126 7.2-liter inline six-cylinder diesel engine. Manufactured from high-strength cast iron, the deep-skirt parent-bore block design ensures structural rigidity and optimal crankshaft support under heavy-duty operating conditions. This assembly is engineered to accept both the 2-valve 3126 cylinder head and the 3-valve 3126B cylinder head, providing broad service coverage across the engine family. The block features precision-machined main bearing caps, integrated oil galleries, and coolant passages designed to meet original equipment thermal management requirements. Remanufactured units undergo 100% boring and sleeving with new camshaft bearings installed to restore OEM dimensional tolerances. Application coverage includes 1998-2002 3126 engines with ESN prefix CKM, widely deployed in medium-duty trucks, construction machinery such as the 320 and 322 excavators, 938 and 950 loaders, and industrial power units.