Description

The Cummins Fractured-Cap Connecting Rod Bearing RB-3945918 (0.25 mm undersize) is a precision-engineered bearing shell designed for diesel engines equipped with fracture-split (fractured-cap) connecting rods . This bearing directly replaces OE part number 3945918 , restoring correct oil clearance and crankshaft support after light crankshaft journal regrinding in Cummins diesel engines . Fractured-cap rods require bearings manufactured to extremely tight tolerances to match the unique fracture-split mating surfaces. The 0.25 mm undersize specification compensates for minimal journal material removal, ensuring proper bearing crush, stable oil film thickness, and precise journal alignment under high combustion loads. Manufactured using high-quality bearing alloys with advanced overlay technology, the RB-3945918 rod bearing delivers 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 service life in modern, high-output diesel applications. This bearing is commonly installed during engine rebuilds, bottom-end overhauls, crankshaft machining repairs, and professional remanufacturing projects . It is trusted by diesel technicians, fleet maintenance teams, and engine builders who require OEM-level accuracy and durability for fractured-cap rod applications. Cross-Reference Aftermarket Reference: RB-3945918 OEM Reference: 3945918 Size: 0.25 mm Undersize Type: Fractured-Cap Connecting Rod Bearing