Question about 1999 Pontiac Bonneville

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I need to replace the front pulley bearing in the supercharger. Do I need to take the snout off or can I get to the bearing without?

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Posted on Mar 24, 2011

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You should probably take the snout off, it will be much easier to work on the bearing without being crammed into the engine bay during the repairs. also if you have to get the bearing pressed in or out, youll need to remove it to take to a shop anyway.

Posted on Mar 24, 2011


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1 Answer

Bad supercharged

First off............. It sounds horrible. The bearings are the primary failure point. The supercharger is actually not that prone to failure. I've had several SC 3800's with well over 150,000 miles without an issue. I've lost idler pulleys many times but an actual component failure like the SC./

Dec 09, 2013 | 1995 Buick Riviera

1 Answer

The bottom pulley for the drive belt is wobbling and making a loud sound. do i need to replace the pulley and is it the bearings in the pulley?

The bottom pulley on any engine is attached directly to the torsional vibration damper which is attached to the crankshaft. That pulley drives the serpentine belt and has no bearings. First thing you need to do is find out if the pulley bolts have become loose or if the damper on the crank is loose.
If you find the pulley loose, if the bolt holes are not elongated, just tighten it back up. If the damper is loose, remove it from the engine (puller usually necessary) and inspect the crank snout and the alignment key for wear. Any damage to the damper requires that it be replaced. If the crank snout is severely damaged, that requires that the crank itself be replaced (very expensive).

Jun 09, 2011 | 2001 Oldsmobile Alero

1 Answer

Have a 3800 Supercharged V-6...(GM) The front of the supercharger is making a grinding sound when spinning...can I replace just the pulley and adaptor on the front of the supercharger without any other...

I was told the dealership was going to charge 2500 dollars for this repair. My friend did it himself in an hour. local machine shop can press bearing out and new one in. Worth checking into.

Apr 04, 2011 | 1993 Buick Park Avenue

1 Answer

Can my supercharger be low on oil, i am hearing a bearing whirring noise? if my supercharger is no longer any good and i want to bypass it will this have any ill effects on my engine. thank you!

Yes it can be low, check it and refill it using the proper oil. GM 12345982 ......the oil level plug is near the base of the snout. oil level should be a bottom of plug threads, right side, as you are looking at the SC from the right front wheel. No, you cant by pass it.

Jan 20, 2011 | 1998 Pontiac Grand Prix

2 Answers

2004 nissan xterra supercharge there is a noise in the turbo and im not sure what is causing this noise eighter the pully or a barring inside the turbo.

Superchargers are notorious for going through bearings.However to narrow it down take a spray bottle of water and as the car is running squirt some water on the pulley .If the noise goes away for a bit then its the pulley if not then it may be coming from the supercharger bearings. You can take them apart if you're handy and change the bearings out,if not its off to your local garage I'm afraid.Good Luck

Oct 18, 2010 | 2002 Nissan Xterra

1 Answer

Yes I have a 1998 pontiac grand prix gtp on the supercharger, there is a pulley on the end of it!. Does this pulley have a bearing in it!

The pulley itself does not have a bearing in it. The shaft however that the pulley is pressed onto does, inside the snout.

Oct 18, 2010 | 1998 Pontiac Grand Prix

2 Answers

It sounds like loose debrie in supercharger what could it be on a 99 regal and how can i fix it every 10 to15 seconds makes this noise like acorns in there

This is simple!!! I had the same problem in my GS. The part is called the supercharger coupling. It is made of nylon and can't be bought from the dealer BUT can be found in Ebay for about $30. This is a NEW part for the Eaton M90 supercharger. That is all it is!! The holes in the coupling wear slightly oblong creating a little bit of slop and it sounds TERRIBLE.

Be careful with the sealing surfaces behind the supercharger snout, reseal with a gasket maker (Loctite makes some) and refill with the correct fluid.

Jul 31, 2010 | 1999 Buick Regal

1 Answer

Need to replace supercharged engine and trans. in a 96 Riviera

Faster and safer to drop the whole unit from the bottom with the cradle. Replace the supercharger snout bearing and seal before you install the replacement engine and the supercharger belt. Also replace the boost valve to your transmission just to ensure your getting the proper transmission line pressure throughout your transmission.
Thank you for using fixya and be safe

Jun 02, 2010 | 1996 Buick Riviera

4 Answers

1998 Pontiac Grand Prix GTP Supercharger coupler

The rattle you are/were hearing is typical on the Eaton blowers. After they get some miles on them, the coupler wears out and the holes become ob-longed or out of round which causes the rattle you are hearing.
Usually at idle you can hear it very clearly.
I have changed a few, and they are pretty simple to change. Just take off the supercharger belt, then you may have to remove your alternator bracket, depends on which years, drain the supercharger oil with a spray bottle sprayer (it does stink badly) then just remove the 10 or so bolts that hold the snout to the housing. Remember to keep track of where they go, some are different lengths.
You may have to use a rubber mallet, or your hand to hit the snout around to break the gaskets loose. Pull off the old black hockey puck looking thing (coupler) clean out the snout, attach new coupler, then reassemble and put new supercharger oil back in, and your rattle will be gone, at least for another 100k miles.
Best place to get a coupler is at,
Costs about 30, plus the few bottles of oil for the supercharger.

May 15, 2009 | 1998 Pontiac Grand Prix

2 Answers


These cars have a lot of problems with all the idler pulleys and the tensioner. You will most likely have to replace them.You may also want to check the harmonic balancer and make sure it is running true.Spin the supercharger by hand with the belt off,it should spin freely with no end play in the shaft to speak of.I hope this helps...Dan

Jun 14, 2008 | 2000 Pontiac Grand Prix

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