Description

The Cummins Connecting Rod Bearing 3901432 (0.50 mm / .020” Oversize) is a precision-engineered oversize rod bearing designed for Cummins 6CTA and 6CTAA 8.3 diesel engines using piston 9247 . This bearing is required when the crankshaft rod journals have been machined to .020” undersize to correct wear, scoring, or out-of-round conditions. Manufactured to OEM specifications , these .020” oversize Cummins rod bearings are produced from high-quality bearing materials that provide excellent load-carrying capacity, strong fatigue resistance, and stable lubrication under heavy-duty operating conditions. Selecting the correct oversize rod bearing is critical for maintaining proper oil clearance, consistent oil pressure, and long-term engine reliability. The Cummins 3901432 connecting rod bearing is commonly installed during engine overhauls, in-frame rebuilds, and bottom-end repairs where standard or .010” oversize bearings are no longer suitable. When installed with a properly machined crankshaft, this bearing helps restore factory-level performance and extends engine service life. This rod bearing set is ideal for professional engine builders, diesel repair shops, and fleet maintenance programs servicing Cummins 8.3L engines.