Description

The Cummins Push Rod 3904679 is a precision-engineered diesel engine valvetrain component designed to transfer camshaft and lifter motion to the rocker arm , ensuring accurate valve timing and smooth engine operation in Cummins diesel engines. This push rod is a direct replacement for Cummins OEM part number 3903456 , making it ideal for cylinder head service, valve train repairs, and complete engine rebuilds. Manufactured from high-strength, hardened steel , this push rod is built to withstand continuous reciprocating motion, high valve spring loads, and demanding operating conditions common in heavy-duty diesel engines. The precision-machined ends ensure proper seating in the lifter and rocker arm, reducing wear and maintaining consistent valve lift. Designed for accurate length, straightness, and reliable motion transfer , the Cummins 3904679 push rod helps maintain correct valve timing, reduces valve train noise, and supports long-term engine reliability. Replacing worn push rods during a cylinder head overhaul is critical to preventing uneven valve operation, excessive wear, and potential valve train failure. This pushrod is commonly used as part of an upper gasket set or valve train service in Cummins diesel engine rebuild and cylinder head repair applications , including on-highway trucks, industrial engines, and heavy-duty equipment.