Ford van and serpentine belt slips off!
 

I am having a problem where the serpentine belt will slip off after short periods of driving. The belt brand new will come off after say 200 to 300 miles. It first started after I had the engine replaced with a used one. Van motor is a ford 4.9l inline six. What could cause this? Since I have replaced the tensioner pulley, starter and smog pump. I use the van for work and have been burning through belts been under the hood more than enough times. Thanks for any replies

RE: Ford van and serpentine belt slips off!
 

get a straightedge and check the alignment of your pulleys, one is probably off a little, or is bent and wobbling.

RE: Ford van and serpentine belt slips off!
 

Ok, If off how would I adjust? Washers. I think all pulleys are spinning straight I'll check again

RE: Ford van and serpentine belt slips off!
 

Assuming all the pullys are in alignment,I think you may not have enough tension on the belt. Tighten it up.

RE: Ford van and serpentine belt slips off!
 

Do ford's have tensioner pulleys? If so that might fix s***

RE: Ford van and serpentine belt slips off!
 

They do I think i'm going to replace again maybe defective.

RE: Ford van and serpentine belt slips off!
 

wow i guess i should have read a little more closely, oh well, good luck with your belt