I've posted a pic of a serpentine belt we removed after only being on a week from a '92 Jeep. Not sure if it's a case of just super old material (on the store rack for 2 years) or what that caused it to fray and break. Couldn't find any obvious problem with bearings or pulleys as a possible cause and also wasn't sure if the last one was too tight when it went on so, how tight should a serpentine belt be when it's installed and is there any immediate tighening schedule generally recommended due to belt stretch? Any replies are greatly appreciated.
TIA
pic of the belt: