Squeaking sound from engine compartment

[StriderF4i]

Hey guys,

You all were a huge help when I was having EGR problems before, so I'm turning to you for more advice. My 2005 has developed a squeaking noise from the engine compartment. It's a belt or pully or something. If this were an older car, I would say it sounds like the belt is stretched and is starting to slip. However, I'm sure this truck has a belt tensioner, so that can't be the case, can it?

It sounds just like a hamster wheel that needs to be greased. "squeak, squeak, squeak" From what I can tell, it's RPM dependent. The faster the motor revs, the faster the squeaking. Any idea what I should look for? Any common problems that this sounds familiar to anyone?

One other thing, when I peered into the engine bay with the motor running, all the pullies look perfectly balanced, except the big one on the crank. It had a noticeable wobble (but just slightly). Should I be worried? I don't have a lack of power, and the truck is running great. Just this damn squeaking noise.

Thanks for any help you can send my way...

[2005F250]

Does it do it with the A/C off?

[m-chan68]

Does the noise disappear, when you run the engine with tension from the belt released?

[StriderF4i]

Yeah, noise is there with or without the a/c. Do I just put a breaker bar on the tensioner to allow slack in the belt with the motor running?

[reifsnm]

i had the same thing, they ended up changing the belts and altenator i think there is a bulletin on the miss alingment on the pullys

[StriderF4i]

Originally Posted by m-chan68

Does the noise disappear, when you run the engine with tension from the belt released?

On most cars I've messed with, there's an arm with a square hole for a 1/2" drive ratchet to fit into. I can pull back on this arm to take tension off the belt to remove and replace it. I can't find anything similar on this engine. Could you point me in the right direction?

It's hard to tell, but I think the noise is coming from the passenger side of the engine compartment. Looks like I have two alternators. One is obviously up high, but I think there's another one down below. Maybe the squeak is coming from one of them?

Thanks for your input...

[StriderF4i]

Don't bail on me now! Someone chime in! Thanks...

[mrnecsteve]

I would be most suspicious of the bearings on the tensioners wearing and going out of alignment.

[StriderF4i]

Any way I can get a pic of the tensioner? I can't tell which pully is which. Thanks!!!

[stump0331]

i heard the same thing and thought just like you it was a pulley or something

ended up being blown head gaskets, go figure

try running the truck and take the degass botle top off and see it its still there