Description

The Cummins Rod Bearing RB-3945917 (Fractured-Cap Type) is a precision-engineered bearing designed specifically for fractured-cap connecting rods , where exact alignment and bearing crush are critical. This bearing directly replaces Cummins OE part number 3945917 , ensuring OEM-correct fitment, oil clearance, and long-term durability. Designed for use in Cummins diesel engines , fractured-cap rod bearings are manufactured to extremely tight tolerances to match the unique fracture-split mating surfaces of modern connecting rods. Proper bearing geometry is essential for maintaining crankshaft journal alignment, stable oil film thickness, and smooth engine operation. Manufactured using high-quality bearing materials with advanced overlay technology, the RB-3945917 rod bearing offers excellent load-carrying capacity, resistance to fatigue, and protection against metal-to-metal contact under high combustion loads. Precision shell construction ensures consistent oil flow, reduced friction, and extended crankshaft life. This rod bearing is commonly installed during engine rebuilds, bottom-end overhauls, and connecting rod replacements , especially in late-model Cummins diesel platforms using fractured-cap rods. It is trusted by professional engine builders, fleet maintenance teams, and diesel repair facilities.