Cummins 3977547 Camshaft Assembly

Technical engineering specifications for camshaft part number 3977547 designed for Cummins QSB4.5 four-cylinder 4.5L diesel engines and Komatsu 4D107 equivalent power units. Component features induction-hardened bearing journals and precision-ground cam lobes to maintain valve lift profiles and timing accuracy under continuous heavy-duty operation. Manufactured to OEM metallurgical standards with chilled cast iron or forged steel construction for wear resistance and dimensional stability. Material composition includes high-carbon alloy steel with surface hardening treatment on lobe profiles and journal diameters. Direct interchange for Cummins part numbers 3970117, 3971586, 3968381, 4896418 and Komatsu OEM 6751-41-1210. Compatible with Tier 3 and Tier 4 emission configurations utilizing high-pressure common rail fuel systems.