A warning about chirping accessory belts.



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Thread: A warning about chirping accessory belts.

  1. #1
    Join Date
    Jul 2014
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    A warning about chirping accessory belts.

    As you may know, a chirping belt is indicative of pulley misalignment, rather than a slipping belt which is more likely to produce a continuous squeal.

    My belt started chirping and eventually broke. It split longitudinally due to the wear on the edges. At first glance I couldn't see any problem, the only thing that I noticed were some fine metal filings around the base of the tensioner (where the spring lives).

    All the pulleys spun freely with no noise or excessive play.

    On closer inspection, the crankshaft damper pulley seemed to be very close to the engine (timing) casing.

    I removed the pulley and this is what I saw.

    The first picture shows where the pulley had been rubbing on the timing cover. The other two pictures show how the outer ring of the pulley had moved with respect to the central part. I have never seen this happen before, maybe it was a manufacturing fault, but eventually the two parts could have separated or worn through the timing cover.
    Attached Images

  2. The Following 3 Users Say Thank You to fluxgate For This Useful Post:

    Caraman99(05-19-2017), invader(05-20-2017), JC1(05-19-2017)

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  4. #2
    Join Date
    Jan 2017
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    Thanks for the pics fluxgate. What engine is this?
    Steve
    1999 Caravan LE, 3.3L, 300,000KM
    2005 Saturn Vue AWD (Honda J35 3.5 V-TEC 260HP) 216,000KM
    1982 Suzuki Katana,(ported/shaved head,11:1,4in1,KNre-cal/filters,cam,120HP)

  5. #3
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    3.6L Pentastar, 2011, only 28,000miles.

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  7. #4
    Join Date
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    Quote Originally Posted by fluxgate View Post
    3.6L Pentastar, 2011, only 28,000miles.
    Again, pics are great. Thx!

    Could there have been a part missing or something? It doesn't make sense to me.
    Steve
    1999 Caravan LE, 3.3L, 300,000KM
    2005 Saturn Vue AWD (Honda J35 3.5 V-TEC 260HP) 216,000KM
    1982 Suzuki Katana,(ported/shaved head,11:1,4in1,KNre-cal/filters,cam,120HP)

  8. #5
    Join Date
    Feb 2016
    Posts
    127


    Quote Originally Posted by Caraman99 View Post


    Again, pics are great. Thx!

    Could there have been a part missing or something? It doesn't make sense to me.
    Nothing's missing. It's an elastomer damper crankshaft pulley (harmonic balancer). The outer weight ring is unbonded from the rubber elastomer damper band, and has shifted over closer to the crankcase.

    http://www.rockauto.com/en/catalog/d...+balancer,5512
    Last edited by invader; 05-20-2017 at 10:31 PM.

  9. #6
    Join Date
    Jan 2017
    Location
    Montreal
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    Quote Originally Posted by invader View Post
    Nothing's missing. It's an elastomer damper crankshaft pulley. The outer weight ring is unbonded from the rubber elastomer damper band, and has shifted over closer to the crankcase.
    Yeah, I get it now invader, I had a balancer failure on my Saturn.

    (BTW, invader, I'm ordering the KYB monotube rears for now, probably the complete KYB strut assemblies later this year.)
    Steve
    1999 Caravan LE, 3.3L, 300,000KM
    2005 Saturn Vue AWD (Honda J35 3.5 V-TEC 260HP) 216,000KM
    1982 Suzuki Katana,(ported/shaved head,11:1,4in1,KNre-cal/filters,cam,120HP)

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