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Serpentine belt alignment

Old 03-12-2019, 02:56 PM
  #1  
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Model Year: 2010 528i e60 N52k
Default Serpentine belt alignment

The pulley located on the spring tensioner appears to be about 1/4 inch wider than the width of the serpentine belt.

I make an assumption that when the BMW dealership changed the belt a few years ago, they aligned the serpentine belt on the tensioner pulley exactly in the middle of the pulley. If they did, there would be a small empty space on the pulley today towards the radiator and also a small space on the pulley towards the firewall.

Two questions:

When most of you are putting on a new serpentine belt do you align the belt exactly in the middle of the pulley or doesn't it matter?

If I loosen the tensioner and move the belt exactly in the middle of the pulley, would I find the belt comes back to the front edge of the pulley closest to the radiator again?



scottalexander is offline  
Old 03-12-2019, 08:52 PM
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Default

If the pulley is on the flat side of the belt, it will ride naturally to one side or the other depending on any minor misalignment/tolerance of the tensioner. Moving the belt will only have it go right back. If the belt is fully riding on the pulley, you're fine.
audiophool is offline  
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