Hey I changed my drive belt today (serpentine belt) whatever you want to call it and I opened the bonnet after work and noticed the belt has slide off the middle of the pulley on the water pump and is now sitting almost off the side, am I in for a new tensioner?
Attached a photo if that helps

 

 

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I forgot to add that if I sit it correctly on the tensioner it pulls the belt back to the same spot

Probably you need to replace the tensinoner rollers. (Worn out)