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  #1  
Old 07-25-2017, 03:41 PM
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Bad Pulley or Bad Serpentine Belt Squeak?

I recently changed out my voltage regulator on my 2006 4.8is. After I put everything back together and started the car i began to hear a loud squeak that seems to be coming from either one of the pulleys or the serpentine belt. If I rev a little noise gets much louder. So I took everything apart and tried adjusting the serpentine belt a few times and didnt have any luck. I then removed belt and put it on the opposite way. The noise definitely is less loud then originally but its still there and doesn't sound great. Car has about 78k miles so I'm not sure if I should just start replacing stuff or if I did something wrong. I did inspect the belt and it does look pretty clean. I also removed the belt and spun each individual pulley and didn't hear or see anything unusual. Any thoughts? Here is some pics of what it looks like.
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  #2  
Old 07-26-2017, 12:28 PM
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Belt service time. At 78K and 10+ years of service just replace them all you will be happier. Belt life is 60K/5-7 years max.

Belts get glazed and brittle due to temp swings and ozone. Tensioners, idler pulleys, etc get old and the bushings dry out causing high frequency noise that is RPM dependent. Quick test, spray some WD-40, belt "lube", etc on the belt...noise gone? Belt time. (Don't forget to clean off everything to get the oil residue off)

Tip: Replace everything at one time as it will save you from doing it piecemeal over the next few miles/months.
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Old 09-09-2017, 10:57 PM
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I've replaced the idler tensioner twice. Most recently about 30K miles after I did it. I also just replaced the idle pulley. Pretty easy job.
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Old 09-25-2019, 08:30 PM
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I just replaced my alternator and the belt was doing the same thing. I actually replaced the belt while doing the alternator so I'm pretty sure it was not the belt. Today I ended up getting towed off the freeway because I lost power. Belt is trashed. Did you find out why it was squealing on yours?
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Old 09-25-2019, 08:34 PM
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Sounds like a seized idler or pulley...
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Old 09-25-2019, 08:38 PM
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I suspect it was. I did need to remove the lower one to get the alternator out. Could it be that it was tightened to much?
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Old 09-25-2019, 08:44 PM
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Quote:
Originally Posted by Jnorton75 View Post
I suspect it was. I did need to remove the lower one to get the alternator out. Could it be that it was tightened to much?
Possibly... When you say the belt was trashed, was it shredded, with bits of rubber hanging off it and rubber dust all through everything? If so, there is something that is supposed to spin that isn't... or the belt tension was low and the belt was slipping - a lot. Are you sure the belt was routed correctly and had proper tension? BMW belt routing is almost a black art...
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Old 09-25-2019, 08:54 PM
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It was shredded. At this point I'm not sure about "anything" but I will be taking it apart soon and have more details. Just wanted to get an idea of what to look for.
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Old 09-25-2019, 09:00 PM
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Well, find a belt diagram for you car (what year/engine, btw?), and when you fit the new belt, check all items the belt runs around. Only the crank should NOT move, everything else the belt touches should rotate. And fitting the belt should require the relaxation of at least one tensioner, so that after the belt is fitted and the tensioner is released, the belt should be tight at all points.
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Old 09-25-2019, 09:08 PM
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4.8 2006. I did pull up the diagram when I installed the new belt, seemed like there was only one way for it to fit and the tension seemed good so I think something must have been binding, either the pulley I removed and reinstalled, maybe the tensioner pulley or the alternator?
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