Case IH J921558 Engine Oil Cooler Assembly

The J921558 engine oil cooler is a critical heat exchanger component designed to maintain optimal engine oil viscosity and temperature in heavy-duty diesel applications. It is engineered for the Cummins 6B5.9 and 6BT5.9 5.9L inline-six cylinder engine platforms, widely utilized in Case IH and New Holland construction and agricultural machinery. This cooler core replaces OEM references J921558, J957544, 3921558, 87416028, and 3957544. It integrates into the engine lubrication circuit, transferring excess heat from the engine oil to the engine coolant system. Applications span Case 680K, 680L, 780C backhoe loaders; 621, 621B, 621C, 621D wheel loaders; CX210, CX290 excavators; and Case IH 1644, 2144, 2344 combine harvesters. New Holland tractor fitment includes T6030, T6050, T6070, and TS115A series.