Squeal

[aceltx]

I have been chasing a squealing sound on my engine for awhile now....it has a new alternator new tensionsr pulleys, new waterpump...it sounds like its a pulley, it only happens when engine is first started seems to go away as engine warms up, sounds a little louder and takes longer to go away now than it did in the summer. I have started it with belt on noise was there, then i shut it off and removed the belt and started it, i did run it long but the noise was not there. Anyone have any ideas or experienced same noise?? TY

 

[Magnum PD]

Try turning and checking for slap at pulleys you haven't replaced

 

[6.0 Tech]

Did the belt get contaminated with coolant prior to the water pump swap? Try spraying it with either brake clean or silicone lube and see if it goes away.

 

[aceltx]

Def not a belt noise, older pulley no slop, really sounds like a pulley squeal but im startin to think could be sonethin else. Does hpop make similar noise when starts to go? Only old pulleys left is crank an PS pump

 

[fastersteve]

i just went through this exact thing.

Mine turned out to be the fan clutch, which I had changed last year...

 

[mandkole]

you've confirmed its not a belt? A little spritz of brake clean where the belt enters a grooved pulley is all you need. If not, is an intermittent chirp or steady howl? Does it change if the AC clutch is disengaged/engaged?

Ive noticed that when its cold, you can hear the hpop a little during the first minute .

 

[aceltx]

I am 100% sure its not the belt its not a belt squeal more like a bearing or pulley, metal squeal. I think I have an old belt from when i put this new one on a year agao, i will try it 2morow for the hell of it. I have not specifily tried engageing the a/c, but I know that the ac is not on and has t been for a few months and noise is there, and during the summer I remember starting truck on hot day noise was there and I turned ac on while truck warmed up noise did not change.
Fastersteve....the noise u are talkin about was it only present when engine was warming and for a short period then would go away until you restarted when engine was cold and did it sound like a pulley bearing?

 

[fastersteve]

Yes, that describes it exactly. Started the first time over 2000 rpm for a few seconds, over time it started to last longer and more frequently.
Easy enough to check. Take the fan and clutch off and go for a short drive.