The tensioner is a spring-loaded pulley designed to keep the serpentine belt tensioned on the pulleys. Over time the tensioner spring can weaken or break allowing the serpentine belt to come loose.
This replacement tensioner assembly by Dayco for '03-'26 Dodge Cummins Turbo Diesel trucks with 5.9L or 6.7L engines ensures that the serpentine belt stays tight.
FITS: 2003-2026 Ram 2500/3500 - 5.9L and 6.7L Cummins 2008-2026 Ram 3500/4500/5500 c Cab & Chassis with 5.9L and 6.7L Cummins