Squeaky belts

[chrisinkanata]

Need some thoughts here...I've replaced the surpentine on my '02 7 times in the last few years because of the squealing. I've tried every imaginable brand but after a couple of months they all start to squeal. I've tried wax (thinking they maybe dried out), I've tried belt dressing. None of these things work. Anyone else experienced this?

Chris

[Onebigcanuck]

Yup, I've not replaced them as many times but they do squeal. One service manager said all you had to do was take a wire brush and take the glaze off while the engine is running. Been there, done that, didn't work either.

[DmaxMaverick]

If you've replaced the belt 7 times with different belt brands/designs, the belt is most decidedly eliminated as the problem.

Other possibilities:
Weak tensioner
Contamination source (coolant, oil, etc.)
Not routed properly
Worn out idler (will glaze the belt)
Dragging/overloaded accessory

If they start out OK, then start to squeak after a while, something is causing this. If your tensioner is good, check it for excess tensioning travel. If you have significant travel remaining (with the belt installed), get a smaller belt. The travel/belt length is about 2:1. For every 2 cm of belt length, the tensioner will require about 1 cm of travel. Once belts begin to slip, it will only get worse as they glaze. You could also try buffing the pullies with a wire wheel and die grinder (only the metal pullies). If a pulley is glazed, it will slip, cause the belt to overheat and glaze other pullies.

[Duramaster]

OR you could also make sure that the P/S pulley is installed properly (nose of pump shaft flush with hub of pulley. I also like to take a dental pick to all the grooved pulleys and make sure that there is no debris in them. and if all else fails............... here is a new bulletin.......................... :D ................................. :D





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Subject: LBZ LB7 LLY 6.6L Duramax Diesel Engine Accessory Drive Belt Chirp, Squeal or Squeak Type Noise at Cold Start Idle (Replace Accessory Drive Belt) #07-06-01-003 - (03/07/2007)



Models: 2002-2007 Chevrolet Silverado (Classic)

2006-2007 Chevrolet Express

2003-2007 Chevrolet Kodiak C4500/C5500 Series

2002-2007 GMC Sierra (Classic)

2006-2007 GMC Savana

2003-2007 GMC TopKick C4500/C5500 Series

with 6.6L Duramax

[AnzacRon]

Run a bar of soap on the belts while running!

[Duramaster]

Using a bar of soap or any belt dressing on the serpentine belt is a big no no! It just makes a big mess and more often than not makes the noise worse.

[Ramster21]

Buy a Gatorback belt, by Goodyear... Last 3 -4 times longer..
Also used to use on my Cummins, but I've been converted since then, it almost eliminated the loud chirp when it shut down.
my .02 cents.:cool:
20+ years of wrenching experience

[haunruh]

I'm with Ramster21 ... replaced mine with a Gatorback and no squeal.