Question about 2001 BMW 325

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Squelling belt I thought the belt was slipping, but that is not the case. I was told it was probably the upper idler pulley, but I am not so sure. I cranked the car while it was cold and applied belt dressing with no success. Once the engine heated up to the point when the thermostat opened to allow water to pump the noise stopped. I let the car run for a few minutes and restarted a couple of times and there was no more noise. It appears to only make the noise while the engine is cold. Could this be the water pump making the sound?

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  • gshirley07 Aug 28, 2008

    The car has not made the noise since I posted my problem, I am not sure what the issue was but I am sure it will return. Thanks for your input, it was very informative.

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  • BMW Master
  • 5,568 Answers

Yes, it could be.
The fact that it quiets might mean that the internal seals are leaky allowing water to enter bearing surfaces that dry, then squeal.

Look for any traces of the water pump starting to drool; there is a hole (normally underneath) that allows water to drain if the seals fail.

Posted on Aug 24, 2008

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What makes a belt squeak?


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Removal & Installation

  1. Rotate the drive belt tensioner clockwise and remove the drive belt.
    WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.


    0996b43f80204f01.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar


To install:
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    WARNING Never suddenly let go of the tensioned idler pulley. The force of the spring pressure suddenly released may damage the idler pulley mechanism. Always release the spring pressure gradually.


    0996b43f80204f01.jpg enlarge_icon.gifenlarge_tooltip.gif

    Fig. Rotate the belt tensioner to relieve tension on the belt-4.6L engine shown, others similar


To install:
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f897cde.gif
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