Squeak on start up

[Writefast]

So the new Yuke has a squeak/squeal on start up. According to the service records, I just bought this thing, both water pump and tensioner were replaced in the last 2-3 years. Belts too. Current belts look like new. Any thoughts?

 

[OR VietVet]

Depending on where you live and how cold it gets and salt/slush on the road, it could be belt noise. You could remove the belt and do a cold start and see if noise is gone. You could also post a video of the noise for us to hear. You could also post the vehicle info, unless it is a secret. Post vehicle info in the Signature to stop all guess work.

 

[Writefast]

Just done. She’s an 07 and lived her entire life in Fl as far as I can tell. To my ear it’s a water pump, chirps for a bit and then trails off. I’ve only driven her for a total of 3 hours.

 

[OR VietVet]

Chirping could be a dry/glazed belt. Again, remove belt and see if noise goes away, on start up. Could be water pump. Get a mechanic's stethoscope and listen at the bearing snout.

 

[Writefast]

To be clear, you mean the main belt only? The motor is very glossy and I’m concerned that someone got creative with wheel shine spray and may have ruined the belts but on the highway and in town she’s great. I’ll grab some audio tomorrow. Thanks very much for the input so far!

 

[OR VietVet]

Yes, start with just the main belt.

 

[Dustin Jackson]

@Writefast Depending on the setup there are 2 pulleys, when mine was doing what yours is doing it was the lower pulley/tensioner for the AC belt. Some Tahoes don't have a tensioner on the AC belt, find out if yours does

 

[wjburken]

@Writefast Depending on the setup there are 2 pulleys, when mine was doing what yours is doing it was the lower pulley/tensioner for the AC belt. Some Tahoes don't have a tensioner on the AC belt, find out if yours does

If it’s a 2007, I’m pretty sure it will have an A/C idler/tensioner pulley. Think they got rid of it with the 2009’s. At least my 2007 & 2008 6.2’s had the tensioner but my 2009 5.3 did not.

 

[Joseph Garcia]

My 07 6.2 has 2 belts and tensioners. The issue could be either one. As @OR VietVet recommended, remove the belt and start the engine and see if the squeal still exists. Do it for both belts.

 

[Foggy]

Wash all that **** out of the engine that the dealers put on...
It's like armor-all.. Just attracted dirt and grease.
Could just be some still on the belts and components

 

[Writefast]

Chirping could be a dry/glazed belt. Again, remove belt and see if noise goes away, on start up. Could be water pump. Get a mechanic's stethoscope and listen at the bearing snout.

Scoped. In the photo, if I’m using the damn thing correctly, pulley #1 is relatively quiet. Pulley #2, which looks new, has a lot of grinding to it and visually moves side to side occasionally. There’s a third pulley attached to the AC not pictured. It also seems to have a lot of noise to it. Neither pulley, through the stethoscope, made a “squeaking” noise. That specifically I could not find. Squeak is now consistent if quiet while driving, is less loud on deceleration, and is less loud if I’ve run the engine a while, turn it off, and crank it back up. I have yet to pull the belt and crank

 

[OR VietVet]

#2 is a tensioner pulley. Replace the whole tensioner or just the pulley.

 

[Writefast]

#2 is a tensioner pulley. Replace the whole tensioner or just the pulley.

So the fact that I can’t “hear” the squeak through the steth is okay? The pulley, when I put the probe to the bolt, sounded like it was grinding aluminum. But it did not squeak.

 

[OR VietVet]

So the fact that I can’t “hear” the squeak through the steth is okay? The pulley, when I put the probe to the bolt, sounded like it was grinding aluminum. But it did not squeak.

The grinding is not good. Moving side to side is not good. If the tensioner part is of unknown age, replace the whole thing.

 

[Writefast]

The grinding is not good. Moving side to side is not good. If the tensioner part is of unknown age, replace the whole thing.

Roger that.

 

[Writefast]

Any recommendations on a tensioner that will last more than 3 years? This one was replaced in December ‘21 by the previous owner. I haven’t called the installer yet but the paper work is pretty clear, warranty valid to original purchaser only.

 

[Fless]

Any recommendations on a tensioner that will last more than 3 years? This one was replaced in December ‘21 by the previous owner. I haven’t called the installer yet but the paper work is pretty clear, warranty valid to original purchaser only.

Does it specify the brand or part number that was installed? Wondering what the quality is.

 

[OR VietVet]

Genuine GM or AC Delco.

 

[Foggy]

Gates or AC Delco are the 2 brands of pulleys/belts/tensioners that I use

 

[Foggy]

I've seen in some situations that it's not the part that is built poorly, but the
conditions around it... like really dusty/dirty or very rust belt areas that
the pulleys get **** in them and it just lessens the bearings' life
or the engine is never cleaned properly