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Thread: Shear Grinding Sound?

  1. #1
    Join Date
    Feb 2008
    San Francisco, CA
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    Jet Black 2003 M3 Coupe

    Shear Grinding Sound?

    Recently I noticed a new, strange sound coming from what seems to be roughly the intake side of the engine bay on my 2003 M3.

    At first I thought it could be a belt but they seem fine...Donít know what to make of it...everything seems to (visually) be fine?

    Any guesses where to start looking at?

    Hereís a video of the sound:

    Thanks for any suggestions!
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  2. #2
    MauiM3Mania's Avatar
    MauiM3Mania is offline Observer/Master Skeptic Moderator
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    Central Pacific
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    Get a mechanics stethoscope at any auto parts and carefully place the probe on a non-moving part of the belt tensioners. My bet is you will spot the noise straight off.

    Let us know what you find.

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  3. #3
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    How many miles?

    You can also take off the belts to see if the noise remains. If the noise does remain, then I would start looking at things like VANOS.
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  4. #4
    Join Date
    Mar 2006
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    1997 BMW M3 Coupe
    Quote Originally Posted by dworthy View Post

    How many miles?

    You can also take off the belts to see if the noise remains. If the noise does remain, then I would start looking at things like VANOS.
    Should probably mention if you take the belt off not to run it for longer than 30secs other wise you will overheat the engine...

    I'd take the belt off and spin the pulleys with my hand one by one and find which it making the noise

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