Description

The Cummins Crankshaft 3907804 is a precision-engineered diesel engine crankshaft designed to convert piston reciprocating motion into rotational power , delivering smooth, reliable performance in Cummins diesel engines. This crankshaft is a direct replacement for Cummins OEM part number 3907805 , making it ideal for complete engine rebuilds, major overhauls, and crankshaft replacement applications. Manufactured from high-strength forged steel , the Cummins 3907804 crankshaft is engineered to withstand extreme combustion forces, high torque loads, and continuous heavy-duty operation . The precision-machined main and rod journals ensure proper oil clearance, stable lubrication, and reduced friction, which are critical for long service life and dependable engine operation. Designed to meet OEM balance and dimensional specifications , this crankshaft supports smooth rotation, minimized vibration, and optimal bearing life. Replacing the crankshaft during a full engine overhaul is essential when journals are excessively worn, cracked, or beyond regrind limits, ensuring restored factory-level performance and reliability. This crankshaft is commonly used in Cummins diesel engine rebuild and overhaul applications , including on-highway trucks, industrial engines, and heavy-duty equipment requiring robust and dependable internal engine components.