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hissing or chirping noise from pulleys/tensioners

Discussion in 'Technical Q&A' started by 24000rpm, Sep 4, 2013.

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  1. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,653
    China and California
    #1 24000rpm, Sep 4, 2013
    loud enough to hear it if I just stand behind the car .

    background: timing belt done within the last 1000 miles with new tensioners.
    so I opened the engine inspection panel behind the seats again and the noise is coming from there.

    I tried to pinpoint which pulley or tensionor or wheel is it coming from with no avail.

    is my only solution now to try to replace pulleys one by one and see which one is faulty?
    or is there any good bet? which one is the most likely to have a problem?
     
  2. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,630
    San Carlos, CA
    Full Name:
    Mitchell Le
    #2 yelcab, Sep 4, 2013
    if a bearing is bad, you can isolate that with a stethoscope.
     
  3. bosshog8

    bosshog8 Formula Junior

    Mar 13, 2011
    448
    Pinelands NJ
    Full Name:
    Demetrius
    #3 bosshog8, Sep 4, 2013
    Once you remove the belts there is a very good chance you can identify which one it is by spinning each bearing by hand. A bearing that is noisy almost always feels rough compared to good bearing which has no grind or metallic feeling at all.
     
  4. kens

    kens Formula 3
    Silver Subscribed

    Jun 25, 2006
    1,345
    #4 kens, Sep 4, 2013
    If you have a serpentine belt, that is likely the source of chirping. A very tiny misalignment of any pulley results in chirping. The solution is a Goodyear GatorBack belt. The ridged belt allows for a small misalignment without noise.

    If you do not have a serpentine belt, I can't help you.
     
  5. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,653
    China and California
    #5 24000rpm, Sep 4, 2013
    sorry I didn't mention what car it is

    it is a 360 modena.

    so yea, i have a serpentine belt..


     
  6. netman

    netman Formula 3

    Jun 17, 2008
    1,905
    OC SoCal
    #6 netman, Sep 4, 2013
    I had the same sound you describe. It was AC the idle pulley. Does turning the AC on make it better or worse?
     
  7. 24000rpm

    24000rpm F1 Rookie

    Aug 31, 2012
    4,653
    China and California
    #7 24000rpm, Sep 5, 2013
    how stupid can I get. didn't even try that one when the panel were off


     

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