Description

Bearings: Rod Bearing (Fractured-Cap Type) The Cummins Fractured-Cap Connecting Rod Bearing RB-3945917 (Standard Size) is an OEM-spec bearing shell engineered specifically for fracture-split (fractured-cap) connecting rod designs used in modern Cummins diesel engines . This bearing is a direct replacement for OE part number 3945917 , ensuring exact fitment, proper bearing crush, and reliable oil clearance. Fractured-cap connecting rods require bearings manufactured to extremely tight tolerances due to their unique cracked mating surfaces. The RB-3945917 bearing is precision-formed to maintain correct journal alignment and stable oil film thickness under high combustion loads, helping prevent premature wear and crankshaft damage. Constructed from high-quality bearing alloys with advanced overlay technology, this rod bearing delivers excellent load-carrying capacity, fatigue resistance, and protection against metal-to-metal contact. Precision shell geometry promotes even load distribution and reduced friction during continuous-duty operation. The Cummins 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 and engine builders who demand OEM-level reliability and accuracy. Cross-Reference & Fitment Aftermarket Reference: RB-3945917 OEM Reference: 3945917 Size: Standard (STD) Type: Fractured-Cap Connecting Rod Bearing Application: Cummins diesel engines using fracture-split rods (verify engine model)