Caterpillar 3253915 Cylinder Block Assembly

The Caterpillar 3253915 cylinder block assembly forms the main structural foundation of the C9 ACERT diesel engine. It houses the cylinders, crankshaft, and main bearings, integrating coolant passages and oil galleries. This casting is precision-machined from high-strength gray iron to withstand high combustion pressures and thermal cycling in heavy-duty applications. The assembly typically includes main bearing caps and dowels. It serves as a direct replacement for OEM part numbers 325-3915 and CA3253915. Applications span across hydraulic excavators, motor graders, track-type tractors, wheel tractor-scrapers, and industrial generator sets powered by the C9 engine platform.