belt/pulley noise - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-24-2008, 04:15 AM   #1
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Default belt/pulley noise

i am having a squealing noise someplace comming from the belts or a pulley. I took the supercharger belt off and the noise went away. there is alot of play in the supercharger pulley. i was wondering if the noise is probably my supercharger coupler going, and if so how had it is to change, and what i need in order to replace it.
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Old 04-24-2008, 04:41 AM   #2
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sc coupler going is not a squeal, more like a rattle. The squeal is coming from an idler, pulley, or belt. Unless of course, you spin the sc pulley and hear a sqeal, then it is sc bearings.

to replace the coupler you'll need a new coupler, sc oil (8 oz.), and red gasket maker. Intense-racing.com sells the complete kit. You just remove the nose drive bolts, pull apart, replace coupler, reassemble, and add oil.
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Old 04-24-2008, 04:45 AM   #3
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its a squeal that starts quiet and get louder and higher pitched with engine speed. there is also a slight rattle sometimes. at higher rpm i can't hear the squeal. if it is possible the bearing is going also, what do i need to do to replace that?
also, with the 3.5 in pulley i still max out the boost gauge instantly when i floor the car.
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Old 04-24-2008, 05:03 AM   #4
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bearing replacement is something most people cannot do themselves. One way to test belt squeal is while motor is running, drop a little, as in not alot, of wd40 on the "gator" side of the belt.

How you test the coupler is by rotating the sc pulley back and forth. If you fell/hear a knock when you change directions, that is coupler play. You should not be able to pull on the sc pulley and have it move in and out.
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Old 04-24-2008, 05:10 AM   #5
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i have already tested for belt squeal, it'* not the belts themselves. i have a bearing press available, so i will probably be able to replace it myself, but i will check in the morning for play forward and reverse and in and out and i'll report back.
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Old 04-24-2008, 11:20 PM   #6
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I have that same squeeling noise. It is from the pulley
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Old 04-24-2008, 11:29 PM   #7
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Check each idler pulley, give a little oil and see if that quites them down.
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