What's eating my serpentine belts?

Looking for some help with a "s" belt problem. Had one break, replaced it, got about 3 miles down the road and the new one self-destructed.
Truck is a 1998 Silverado 4x4 w/the 5.0L fi engine. I know IO had the right replacement belt and I double checked the routing against the routing diagram on the radiator shroud, all looked good. No problem with the tensioner, working as it should.
Wondering about the very top "wheel." If you look straight on at the engine at the verfy top the belt runs under what just looks like soem kind of round guide. But it doesn't spin or flex. Not sure what it's purpose is but the belt aas running tight up against it. Shouldn't this have been spinning as well? Otherwise it was just a big friction poin that could be the point of failure. Any help would be greatly appreciated. Thanks!
Mike
Cross posted.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Happened to me once before but my a/c was screwed up and the wheel would not turn causing belts to tear up. Not sure but worth a check.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
check idler pulley.. even though it may look straight and make no noise.. it could be screwed and it draws the belt all over.. OR the AC compressor... best way is to start the engine and look while it is running to see if the belt is true. THEN if all looks okay.. turn on the ac and see if it engages or is seized

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Sun, 03 Jun 2007 15:34:28 -0700, mkerns1026 wrote:

Your belt shouldn't touch any non-spinning surface.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wow... never thought of that :) I was thinking of grabbing on to the belt while the truck was running and seing where my hand gets cut.. HA!!!

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Sun, 03 Jun 2007 22:36:40 -0400, Chevrolet wrote:

Some sort of "round guide" that doesn't spin or flex = frozen idler wheel.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I recently had the same problem. I found that a bolt on the big one piece pulley bracket, (that all of the accesories attach to) was missing. The Take a close look at all of the bolts that connect that main bracket on the front of the engine to the block. You might find that a few of them are loose or possible missing. Without all those bolts in place the force of the tensioner will cause the bracket to bend and the pulleys will not line up properly.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I'm sure it's obvious and might have been mentoined earlier but I had the same issue when my idler pulley was 'sticky'. I guess it had a bad or failing bearing so sometimes it would stick and other times it would spin. At any rate, it cost me 2 belts and a new idler to get it all sorted. That idler pulley was very cheap (I was going to press a new bearing into the casing but the pricing was about the same either way). Also... check the "'" marks on the tensioner - they should be pretty close to each other otherwise the tensioner isn't functioning properly (the range indicator should be visible and self-explanatory).
I hope this helps. Andrew.
in article snipped-for-privacy@localhost.talkabouttrucks.com, CENR at snipped-for-privacy@yahoo.com wrote on 6/12/07 1:37 AM:

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

It's an idler pulley and its supposed to spin freely
Whitelightning
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Sun, 03 Jun 2007 15:34:28 -0700, snipped-for-privacy@gmail.com wrote:

That's just a stop to keep it from flapping around too crazily at certain speeds but it should hardly ever actually touch it. If your belt is solid against it then you are not routing the belt correctly.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Sounds like a seized idler pulley. That "wheel" should spin freely.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.