Quote:
Originally Posted by AROWHED
...it is apparent the alternator pulley is too far forward. The reason is the 12SI alternator fan is too far away from the alt housing, and most likely causing insuffcient alternator cooling as a result. So I am going to reduce the height of the collar bushing between alt fan and bearing. It is currently 3/8" tall...it just can't be the correct fan bushing for a 12SI. I would bet .200"' or so would be plenty.
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That's the way it appears from the pic you posted.
There are some problems with modifying the alternator. First, the longer moment from moving the pulley out increases the torque the bearings have to support and they're already absorbing more than they would if you were running a V-belt. Second, you're stuck with that setup if anything happens on the road, as another poster mentioned. As you've noted, cooling is an issue, as well. The clearance should be quite close to minimize slip and move as much air as possible.
I haven't followed the mechanics of the set-ups on here really well, so I can't address each one, individually. But, the way I would do any installation is to modify the mounts, rather than the pulley placement on the shaft. Think about it. If you mount all the driven units the way they were designed to be mounted, and, if possible, use off the shelf new idlers, you're ahead of the game if you have any trouble.