Description

The Cummins Fractured-Cap Connecting Rod Bearing RB-3945917 (Standard Size) is a precision-engineered bearing shell designed specifically for engines using fracture-split (fractured-cap) connecting rods . Manufactured to OEM specifications, this bearing directly replaces Cummins OE part number 3945917 , delivering exact fitment, proper bearing crush, and stable oil clearance in Cummins diesel engines . Fractured-cap rods require bearings built to extremely tight tolerances to match the unique fracture-split mating surfaces. The RB-3945917 bearing is engineered to maintain correct crankshaft journal alignment, consistent oil film thickness, and smooth rotation under high combustion loads typical of modern diesel applications. Produced with high-quality bearing alloys and advanced overlay technology, this rod bearing provides excellent load-carrying capacity, fatigue resistance, and protection against metal-to-metal contact. Precision shell geometry promotes even load distribution, reduced friction, and extended crankshaft life. The RB-3945917 fractured-cap rod bearing is commonly installed during engine rebuilds, bottom-end overhauls, connecting rod service, and professional remanufacturing projects . It is trusted by diesel technicians, fleet maintenance teams, and engine builders who demand OEM-level reliability and durability. Cross-Reference Aftermarket Reference: RB-3945917 OEM Reference: 3945917 Size: Standard (STD) Type: Fractured-Cap Connecting Rod Bearing