My belt keeps slipping off and becomes detached from the blower to the alternator. After the first time, I fixed the issue with a new belt and that fixed the problem. That was a year ago.

Now, after a new belt from supercharger.com, as soon as I barely get it to boost, the belt falls off. This happened four times in the past month. I've gotten quite annoyed of this so I just left it and drove it without the belt connected from the blower to the alternator.

I noticed that the pulley on the blower itself seems to have some play. Could this be the issue? If it is, how do I go about tightening the pulley? Also, should I replace this pulley? When the belt was on, I do remember it making some minor noises from around the pulley.

Is there something more major that needs addressing?

cliff notes:
-belt slips and detaches from blower pulley to alternator when in boost
-pulley on blower (nose pulley?) has play - how do i tigten the pulley? Should I replace it?
-Is there something more that I should be focusing on?

This is on a GSR, 6lbs, stock setup. All belts I use are Bando (from supercharger.com).

 

is it up and down play? in or out play?

 

there is play in and out. Also, when spinning the nose pulley by hand, you can actually spin it for about a quarter inch then it'll catch the fins and spin.

 

Bad bearing in the SC. Needs to be rebuilt.