1993 F150 5.0L. Recently truck has developed a serpentine belt alignment issue where the air pump pulley is slightly turned in toward the center of the engine. Anyone ever have this problem? Some recent history. Roughly two months ago air pump decided to cause problems. First fix was to pull air pump pulley and install a smaller belt. Didn't work. Tried several belts but none provided correctly tension but lots of squealing noise. Second attempt was to install a delete kit from LMR. Looked good but more issues. First belt came off. Second belt - more noise. Third attempt, gut the air pump and re-install. Still some belt chatter and it shed one rib of the belt. My only explanation is somehow the alternator/air pump mount has become twisted. Any thoughts as to why this is happening?

 

I doubt the mounting bracket is bent. Pull the belt off and check every pulley and bearing.

Also inspect the harmonic balancer, make sure the rubber ring is intact.

 

most likely another pulley is the problem, check the Power steering pump pulley if its flush with the shaft, and without a belt see if the pulley is able to go in/out a tiny bit (its supposed to)