I had my truck about a week & a half now & this just started a couple days ago:


In the morning, the serpentine belt (I assume) squeaks a lot until the truck has been driven a while - then it goes away until you park for a very long time (enough to let the truck cool down) and restart.


Not a major issue, I was thinking about hitting it with some soapy water or belt dressing, but I've never had a truck or other vehicle that developed this symptom so quickly. Should I be concerned with checking a tensioner somewhere?

I was just about to post the same thing. Mine seems to do it all the time though. Does anyone know if there is a Gatorback belt for the LLY, I know this quieted my camaro down alot.

Mine did it the first few days I had it. My guess was; The paint on the pullys had caused the noise and once it had worn off it stopped. Not a peep out of her now.

Mine does it too. It sounds like I have a Cricket under the hood until it warms up. Mine only happens when the AC Pump is not turning. When It engages, It goes quiet. Then when the pump stops, The cricket is back. It is over at the dealer as we speak. I will let you know the results.





There is another squeak when I shut off the truck. It sounds like the belt slips at the last second. GM has a bulliten out on that one. They say it is because The Crank pulley stops so fast, (because of engine compression) That the belt slips for half a second. GM says it is "Normal". I say that is Bull S#!T!!! Every time GM seems to have a "Problem" they can't, or Don't want to fix They just say it is "Normal". This reminds me of the piston slapping noise on the GM Gasser 6.0!!! It is only "Normal" because GM has the "Problem" on most of the ones they make. As you can see it kind of pisses me off that they won't just fix their problems and admit they are wrong.

I had this belt noise problem with my new LLY also. I thought I had a bad pulley bearing. When I took it in, the service writer said it was a glazed belt and that it was probably due to when they cleaned the engine for delivery. They put a new belt on it and I have'nt had a problem with it since.


There was another guy in there with the same problem. By definition, if this happens enough it will be normal.

I had this belt noise problem with my new LLY also. I thought I had a bad pulley bearing. When I took it in, the service writer said it was a glazed belt and that it was probably due to when they cleaned the engine for delivery. They put a new belt on it and I have'nt had a problem with it since.


There was another guy in there with the same problem. By definition, if this happens enough it will be normal.





Did your truck make this noise all the time, or just in the morning when it was cold?


I've noticed mine really only does it in the morning, or sometimes after it's been parked for several hours.


Problem is - it quiets down after it's warmed up, so it would sound fine by the time I got to the dealer... one of those things...

Whatever you do guys, don't put belt dressing on your serpentine belt. It will build up in the grooves and, well, you can guess what will happen over time.

There is another squeak when I shut off the truck. It sounds like the belt slips at the last second. GM has a bulliten out on that one. They say it is because The Crank pulley stops so fast, (because of engine compression) That the belt slips for half a second. GM says it is "Normal". I say that is Bull S#!T!!! Every time GM seems to have a "Problem" they can't, or Don't want to fix They just say it is "Normal". This reminds me of the piston slapping noise on the GM Gasser 6.0!!! It is only "Normal" because GM has the "Problem" on most of the ones they make. As you can see it kind of pisses me off that they won't just fix their problems and admit they are wrong.


My grandfather's '97 Dodge Cummins does the same thing.

OK Here is the latest on the Cold start Cricket noise... The dealer looked and listned and they think it is an Idler Pulley that is underneath the AC compressor. They ordered some parts that should be here in a week or so. I'll let you know if it works.

Mine is doing the exact same thing. It's just under 800 miles right now. I'll keep and eye on it, and this thread.





Gar

I have used Permatex spray belt dressing on every truck since 89. It absolutely works and does not build up in the groves. It does not collect dirt either. I have stopped several squeaks for friends. I use it each time I service the engine. Later! Frank http://www.dieselplace.com/forum/smileys/Approve.gif

I had the exact problem with my 94 S-10 (4.3L). I had the serpentine belt replaced twice only to see (hear) the problem (noise) come back(mornings only). The new belt would be noiseless for about 10000 miles and the squeel would reappear. About 60,000 miles ago I replaced it with goodyear gatorback (maybe gatorbelt) (it was a few more dollars than stock belt) and the squeel never reappeared. The only difference I could see in the belt design was the gatorbelt had many more ridges on the internal part of belt. Nonethe less, the problem my S-10 had for years disappeared and has never returned!

Put me in for one morning cricket too. Soon as it warms its gone. Figure when I take it in for something I will mention it.

I notice that my cricket comes out to play as soon as I accelerate. I thought it was a u-joint like the one I had to replace on my '01 2500HD. So what you guy's are saying is that it is a belt that is slipping?

I've got the turn it off cricket. Shut it down and it chirps good bye to me. Grrrr

LLY DMAX wrote:


There is another squeak when I shut off the truck. It sounds like the belt slips at the last second. GM has a bulliten out on that one. They say it is because The Crank pulley stops so fast, (because of engine compression) That the belt slips for half a second. GM says it is "Normal". I say that is Bull S#!T!!! Every time GM seems to have a "Problem" they can't, or Don't want to fix They just say it is "Normal". This reminds me of the piston slapping noise on the GM Gasser 6.0!!! It is only "Normal" because GM has the "Problem" on most of the ones they make. As you can see it kind of pisses me off that they won't just fix their problems and admit they are wrong.


LLY DMAX,


This is not BullS#!T as you say...How many diesels have you had before this one?? This is NORMAL. I have been around diesel trucks for as long as I have been alive and I own and drive diesels everyday, all diesels do this. My dad is a ASE certified GM tech, certified diesel tech, and an old truck driver, and a diesel pickup owner as well, and he told me along time ago when I first started driving diesels and I asked the same question about the belt squeak at shutdown and he explained to me that the belts are turning at such a high rpm and diesel engine compression is so high that when the engine is shutdown it causes the belts to slip because of the compression. If you don't like what Gm techs tell you, you should sale your truck and buy a Ford or Dodge that will do the same thing, and they will tell you the same thing. Next time you are out if you get near a Turbo Cummins in a parking lot listen how loud the belt squeaks on them when the owner shuts them down. I am not trying to make you mad or act like a know it all & @$$hole but I am just trying to explain to you that this is true believe it or not. I know my ole' 6.5L Turbo does it almost, but not everytime I turn her off. Its just a Normal diesel characteristic.





Edited by: GMC Cowboy Cadilliac

The squeak noise on mine is only in the morning - or after the truck has been parked for several hours. I was almost ready to take it to the dealer, but then I came to my senses. From what I can tell, it's just that - a squeak, probably from the serpentine belt. I'd rather not have the dealer poking around in there unless there's a serious concern.


No squeak when I turn the truck off however ... at least not yet. My brother's '95 Tacoma did the same thing when he first got it - after a while it just went away...


I'll give it a couple weeks - if it gets worse or the symptoms change I'll check it out then.

Yep, mine does the same thing. I used my stethesope to listen to all the componants and all I can figure is it's the belt. Chirp, chirp, chirp.


By the way, I thought i missed something on my stethescope tour so I just went out and looked; no pullys under the AC exept the PS. Listened again since I had it out, still in the belt. 875 miles so far. Let you guys know if it stops.





Mike





Edited by: laborer

I got my truck back from the dealer. They replaced the belt and one of the pulleys. Too soon to say if the Cold start Cricket is gone or not, (Because it was already warm). However the "chirp" when the truck it turned off is GONE, at least for now.


I guess if the Chirp comes back I will just keep getting new belts.http://www.dieselplace.com/forum/smileys/Big Smile.gif

This morning I just took a cup of water with a little dish soap and a sponge then hit the exposed parts of the belt - didn't even turn over the engine - just dampened the parts of the belt I could get to with the soapy sponge.


Dead silent.


We'll see if it lasts. My guess is, were there a problem with a pulley soapy water wouldn't have helped.

I have had the same belt noise for over a year now mostly in the mornings and after long trips and in damp conditions. It has been to the dealer 6 times because the noise would eventually get worse on a trip to Florida earlier this year about 1000 miles the noise was so bad it would not go away even after the 1000 return trip. I have had the tensioner replaced and the power steering pulley aligned twice 5 belts replaced water pump replaced.


And so far what has seemed to cure it was a belt from a local NAPA store as per technical assistance paid for by GM seems they don't know how to make a belt yet.


If you have the noise go and complain it will get worse.


I also have the noise on shut down even after the new belt this isn't bad and I do believe it is from the engine compression.

Mine started the shutdown squeek this morning (960 miles). I wonder why it hasn't done it before now if it is normal and due to engine compression. Has my compression increased? More likely the belt wearing in I guess.

I believe it is simply from not having enough traction, Crank Pulley to belt. If there was enough traction the accessories would stop just as fast as the belt. When the belt is new it works fine but as it wears, it looses the ability to hold to the crank pulley.


To me it seems like it is a design flaw in one of two areas. The belts need to be redesigned, OR there is a problem with the tension holding the belt to the crank pulley, Or a combo. of both. Just because the Cummins, or Powerstroke may have the same problem is no excuse. We bought the Duramax because we believe it is a better than the others. With all of the Millions of dollars spent on making such an awsome engine, (One that the others have had to coppy to compete with) Why can't they make this area of the design better than the others?

Boy, you guys can be ruthlesshttp://www.dieselplace.com/forum/smileys/HiHi.gif


Here is the lowdown, as best as I can tell...
These engines are notorious for a belt squeak. I dont know why but they are. I have seen more then a couple caused from the p/s pulley was not aligned with the rest of them and the belt would want to ride on the edge of the pulley and cause a noise.


The noise on shutdown is perfectly normal, no fix, no attempts should be made to fix. Other then perhaps an aftermarket belt as some have used.


The tensioners seem to be a wear item, they get loose and wobble and can cause a rattle. While its rattling away, vibrating up and down and playing havoc on that belt. While I dont agree with spraying belt dressing on a belt, I know that the Permatex stuff does work. Most of the belt noises are most prevelant under damp and/or cool conditions. I noticed mine the most on morning start up if it was high humidity.


If you do have the squeak, make sure your pulleys are clean, look at the belt and see if you see wear on the edges of it. Look at the p/s pulley and see if the paint is wearing more on one edge then the other, indicating that the belt is not riding true. Lastly, enjoy your truck, if your biggest b$*&h is a squeaking belt........

There was a TSB on the 5.3L for the power steering pump pulley being pushed too far onto the shaft. My 2001 Tahoe needed this correction. According to the TSB it effected early 2001 5.3L engines in vehicles assembled at Janesville WI assembly.