Belt Noise !?!??! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-25-2005, 12:48 PM   #1
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Default Belt Noise !?!??!

MY belt is making a terrible amount of noise...... Its not really a major issue i just wanted to know why it was fine before when I first installed it and now it makes alot of noise... I inspected it and it doesnt look worn and when i tried to align it better it just got worse lol... I have another belt which is a few inches larger which i may try to put on its a gatorback belt and it was on there before i put a new pulley on. I wanted the smaller belt just in case of belt slippage....
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Old 11-25-2005, 01:13 PM   #2
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Which belt, and what brand do you have on each path?

I had to buy Gates Micro-V belts because my local supplier was out of Gatorbacks for my accessory belts on both L67'* last week. I was able to get Gatorbacks for both SC belts.

The Micro-V is a tighter fit because the grooves are tighter than the width of the ribs on the pulleys. I believe this is by design to 'pinch' the ridges, but it makes it tough to put them on, effectively making your belt path longer if you get what I mean.

Both my accessory belts are making a little noise, but I assume they'll 'break in' at some point. I'm not pleased, and will probably be replacing the Gates at least on my SSEi in the future with a Gatorback simply because of the much smaller than OEM pulley on my 160amp alternator. The Gatorback will turn a smaller pulley much better.
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Old 11-25-2005, 02:34 PM   #3
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What do you mean you tried to align them? There is no alignment on our pulleys etc.
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Old 11-25-2005, 05:20 PM   #4
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I mean it kinda looked liek the belt was swaying as it made its cycles it was hard to tell..... and whnever i sparyed belt dressing it would go away for about a day then come back. I tried to just move the belt to the center of the pulley hoping that would just make that noise go away...
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Old 11-26-2005, 12:00 AM   #5
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Belts make noise when they slip. The pulley where the belt is slipping can usually be identified by rubber crumbs or in extreme cases by discoloration of the pulley where it gets really hot from the slipping belt. If everything is stock, and the belt is new, but still slips, suspect that the belt is not sufficently tight. Your belt tensioner may have become weak and is not providing sufficient tension. Belts are more likely to slip if they are forced to drive a smaller pulley that reduces the surface area where the belt touches it. Driven units that are turning harder than usual can contribute to or cause the problem. And, once a belt starts to slip a little, the belt can quickly become glazed which decreases the friction and causes it to slip more. You can check belt tension with a relatively inexpensive gauge called a "Clikit." You need to get the right one for the range you want to read. They cost about $15.

[edit] My '95 FSM says the belt tension on both your belts should be between 50 and 70 pounds taken as the average of three readings. Measure tension midway between the generator and the ps pump for the main belt and between the sc and its idler pulley for the sc belt. The three readings are taken after the engine is stopped and:

1. With engine warmed up and no accessories on
2. After tightening (clockwise) and releasing the tensioner
3. After loosening (counter-clockwise) and slowly re-applying tension.
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Old 11-26-2005, 03:02 AM   #6
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Can you adjust the tensioner or do you haveto get a new one when it gets weak?
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Old 11-26-2005, 03:06 AM   #7
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Old 11-26-2005, 03:08 AM   #8
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New...however if your belt is wandering it'* probably a idler pulley. Best would be to change all your pullies.
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