Main (0.020 Oversize) Main Bearing Shell – Cummins K19

The Cummins 205142 Main Bearing Shell is an OEM engine component designed specifically for K19 series engines with an 0.020-inch (0.5 mm) oversize specification. This main bearing shell, also known as AR12272, serves as a critical support piece for the crankshaft by fitting between the crankshaft journals and engine block. It provides enhanced clearance compensation, ensuring proper alignment, reduced friction, and reliable function in engines that require oversized bearings. Made to Cummins specifications, it offers durability and precision in heavy-duty applications.