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Barry:
If you mean the smooth pulley that is on the tensioner, i am not sure if that will come off or not, I assume so, but have never had a reason to.
The tensioner is held on by 2 bolts, it's not hard to change. I've always removed the fan and shroud to replace it, I forget if this is part of the officila work instructions or not, I've always done it to improve access to the bolts.
The hardest part probably is that in order to get to the lower bolt that holds the tightener on, the tightener needs to be "caged", which means you put a external torx socket on the stud on the pulley I believe you are talking about, and release tension on the belt. There is a nub on the moving part of the tensioner, this is brought back until you can stick a metal pin (a big nail might work) into a corresponding hole in the tightener bracket. Then pressure can be released on the stud and the tightener will stay in this position and the bolt can be removed. If you order the new tensioner, you will see what I mean because all the tensioners I have installed come in the caged position. After you install it you will release it from the caged position and can save the "pin" that the factory uses and will then have a good one to use if you have to do the job again.
Gilly
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