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Belt chirp on 2000 5.3 anyone got any ideas?

paul_driver

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paul_driver Enthusiast

paul_driver

Posted
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So I have a 2000 sierra with the 5.3 (with 124k miles as of 3-5) and when it got cold this last fall the belt started chirping. So I put a new masterpro belt on it and the chirp went away. Then in December I had a new water pump at 121k miles which I know is typical for these trucks. I would have done it myself, but its too cold outside here in Indiana. But anyways it started chirping again and it has not stopped. But the chirp quiets down when its in the 40's outside and the engine has been at operating temperature for a while but you can still here it. I've heard its because of the pulley alignment but I'm not sure. It drives me crazy and its embarrassing! can anyone help?

paul_driver Enthusiast

paul_driver

Posted
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Yes I have. The tensioner is good and there's no play in the idler pulley bearings

Green 1364 Enthusiast

Green 1364

Posted
Posted

Try spraying a good lubricant in the tensioner pulley when it starts. See if it goes away, spray again if it starts. I think these are sealed bearings so you may have to replace what ever one you narrow it down to.

Bob D Enthusiast

Bob D

Posted
Posted

Try spraying a good lubricant in the tensioner pulley... these are sealed bearings....

They are sealed. I can't imagine any spray lube reaching bearings within.

oldscsc Enthusiast

oldscsc

Posted
Posted

Take the belt off and spin all the pulleys. Doing so will isolate the concern to one particular area

 

If all pulleys sound good, try reinstalling the belt so it will spin the opposite direction from current. It is possible that the belt wore in between the time it was replaced and when the water pump was replaced. Chirps can pop up after the belt was reinstalled and spinning the opposite direction from their original wear in.

sahls01gmc Senior Enthusiast

sahls01gmc

Posted
Posted

When you take the belt off, I'd go ahead and replace the tensioner and pulley(s). Cheap insurance if anything.

8.1HD/ALLISON Senior Enthusiast

8.1HD/ALLISON

Posted
Posted

I have had good luck with gatorback belts. If you dont find any pulleys or tensioners bad, i sometimes have luck by hitting belt with a quick spray of carb cleaner while running and then some silicone spray.

los33 Enthusiast

los33

Posted
Posted

I had the same issue.

 

I had replaced the tensioner, idler pulley, belt. Then when it persisted i changed the belt two more times.

 

Ended up finding a leak in the water pump so i replaced it. Then it still squealed so i removed the ac belt to check and it persisted.

 

I purchased a gatorback and still had it.

 

Finally in the end i found old residue of my last belt all on the fan clutch pulley and very little on the idler pulley.

 

I cleaned both with carb cleaner and let it dry, well now after 3 months of annoying chirping it was quiet and has been for the last 2-3 months now.

 

Sent from my Z970 using Tapatalk

waumo1 Enthusiast

waumo1

Posted
Posted

On our 2002 Yukon the fix was to replace the aftermarket belt with a GM belt.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Take one of those scotch-brite pads to the shiny surface of the idler pulley and any other pulley that the belt runs on the shiny side. Don't try it when truck is running. I realize I should not have to say that, but, sometimes people do strange things when it is cold outside and they would rather be inside the house or wife.

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