Hi all..

New to the forum.. Just noticed today that my supercharger pulley was torn off and the belt is a bit mangled. Just wondering if there is a diagram or anything so that I can see how to run the belt etc etc. I did read the pulley is reverse threaded, so I'll keep that in mind. I don't do much in terms of working on cars, but I am broke and refuse to pay someone to fix something I'm more than capable of fixing myself. Any input would be much appreciated.

I need to replace the belt drive idler pulley (smooth).. anything of major importance I should be aware of before proceeding??

Thanks a bunch!

The pulleys are simple bolt on. You'll need a torx bit to get the bolt on and off. T45 if I remember off the top of my head. Also, maintenance such as this is easy easy easy. Don't pay anyone to ever work on the car, unless you've checked here and you don't feel comfortable doing the work yourself. I don't frequent this forum, but I'm also a poor college student, so if you ever have any questions that you can't get answered here, email me.
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nice picture but thats for a series II/III motor... not the same for a early mid 90'* model series 1... what year bonnie is it???... id say its safe to say its an ssei with the supercharged motor... but what year... this will determine the belt setup...

and can you elaborate for us on "pulley torn off"?

also please add the year and trim (ssei) in the Signature section for later questions... it makes it easier on us if we know so we can get the proper info back to ya

If you were as smart as me, you would review his car bio.

Edit: Just in case someone does run across this and needs series one schematics;

regardless, we prefer the info to be posted in the Sig area so we dont have to go looking for it... takes longer to look up your information then look up a fix for your problem... that being the case do you want us to fix it for you too???

i dont think so, now no being rude to moderators
k pumpkin

btw good posts and pictures... keep it up and you'll be of great value

I love you too.

Thanks for all your help. I've already put the vehicle info in my signature, sorry for the trouble. I'm going to try and find the idler pulley locally.. if nothing else, a dealer. Will it do any major damage if I putt around locally w/o the Supercharger functioning as it should?? Unfortunately, my bike is in the shop as well. What a buster.

I wouldnt go any further than you HAVE to

I know of others, myself included, that have limped theirs home without the SC working right because of a bad belt... it wont destroy it but its not real good for it either... so keep the distances short

I'll be nice and gentle while driving Bonnie, I may even be able to get it taken care of by the end of lunch!
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So, A few follow-up type questions. The part highlighted in red is the part that is totally busted; the drive belt idler pulley for the supercharger(smooth). I found it at Kragen O'Reilly and will be going there during my lunch to snag it(Drive Belt Idler Pulley - Supercharger)... looks right to me.



Now, the part highlighted in blue looked to be okay. Off hand, does anyone know whether the part in question is metal? I'll try to take a picture of it during break with my phone. I just want to be sure it'* okay.

The serpentine belt is pretty deformed, so I may as well replace that too.

Torx.. T45? Can anyone else confirm what size I'd need(not that I doubt you, EMC)... and it IS reverse threaded, correct? Hmm.. well, when I get the parts, I'll ask about the install, e.g., getting the belt on, adjusting the tensioner, etc). I'm sure I can look at it and figure it out. I just want to do this right, I've read other places of people totally messing things up and I want to avoid damaging the car and spending more money..

Thanks again fellas.. I apologize for my lack of knowledge.

Few things. First, I just walked out to the car and can confirm that you'll need a T50 bit to remove the idler bolt. Second, that bolt is NOT reverse threaded on my '97 Bonneville motor. I did a little research and came up with this; They're talking about the pulley you've highlighted in blue, not red. I don't see why GM would have changed to a reverse threaded bolt for years post '97. Just remember that it will be very easy to strip the aluminum post that the tensioner mounts to, so you'll have to hunt down a replacement post if you force the bolt the wrong way.

The part you've referenced from O'Reilly is the pulley for the blue highlighted tensioner. You want the larger metal pulley with the rolled front edge; Goodyear part number 49006, Dayco part number 89007.

Tips on installing the belt. Don't let this intimidate you, it only looks complicated. After two or three installs you'll be able to do it in your sleep. Make sure you get the belt lined up correctly on the large crank pulley, its easy for the belt to track a rib off while you're playing with the tensioner; which in my case has caused the belt to squeal a little. Route the belt over every pulley but the automatic tensioner and pull the belt tight with one hand, slack the tensioner with the other and slip the belt over it. Let off the tensioner and you're golden, but go back and be sure the belt is aligned on every pulley, particularly the two ribbed pulleys.

One last small detail. The car will be completely fine operating without the supercharger belt. There are no mechanical dangers of doing so, and the PCM will adjust the fuel trims accordingly. The negative intake pressure will spin the supercharger blades as it pulls air past them, so don't be alarmed if the supercharger pulley is spinning without belt. The car will be an absolute dog for power due to the 8.5:1 compression ratio. Once again, all of this is completely fine and won't harm the engine in any way, I've driven mine in such fashion many times before.

Good luck bro. Be sure to post about how the install went, and of course feel free to ask more questions.