5.9 Cummins Belt Diagram: Routing Guide for Every Year
5.9 Cummins belt diagram. The decal under your hood is the only diagram guaranteed to be right for your truck. A decade of heat cycles and a few pressure washes turn it into a blank rectangle. Then it comes down to a new belt in hand and no routing to follow. Four stages cover the 5.9 from 1989 through 2007. Within each one, an A/C truck can run a different path than a non-A/C truck. Match the engine before you match the pulley layout. First-gens are the simplest of the four to work on. The Bosch VE trucks run one multi-rib belt around the crank, water pump, alternator, and, if the truck has air, the compressor. Non-A/C builds use a shorter loop that skips the compressor pulley entirely. Same engine bay, two different belts. Ordering is where first-gen owners get burned. Dodge varied A/C configurations by build date, occasionally mid-year. The length charts floating around online do not survive that. Measure the belt in your hand. A tape run around the old belt beats any lookup table. A VIN check at the counter beats both. Tensioner drive size and release direction are worth checking on the part itself. Find the cast arrow. Find the square-drive opening. Then read the service manual for your model year before you put a bar on it.












