[Job]

Just had the same problem of not being able to tighten the packing nut. Found the packing nut AND the bushing were turning. Pulled the water pump and found the pump housing was cracked. Bushing would turn while trying to tighten nut but I could not turn the bushing by hand. Bought a replacement housing, put all the existing parts (which were new) into the housing and everything is working fine. Good luck