ROD BEARING HALF UPPER

The Cummins 4932378 OEM Connecting Rod Bearing is a genuine, precision-machined undersize rod bearing designed for remanufactured or machined crankshafts on 1989–2002 5.9L Cummins B-Series engines. This bearing ensures proper oil clearance, correct crankshaft support, and OEM durability during high-load diesel operation. When restoring oil pressure or completing a full bottom-end rebuild, genuine Cummins bearings deliver consistent metallurgy and reliability for long-term engine life. Undersize bearings like the .040” / 1.00 mm variant are used when crankshaft journals have been ground during machining, maintaining factory tolerances and reducing wear, vibration, and fatigue.