Blood curdling sound coming from the engine

Discussion in 'Engine Topic' started by ULTM8Z, Feb 19, 2021.

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  1. Dave Nelson

    Dave Nelson Veteran Member

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    I've heard spun bearings sound like that, hope it's not.
     
  2. Jodi

    Jodi Veteran Member

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    Harmonic balancer...
     
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  3. TTR230

    TTR230 Veteran Member

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    Some interesting ideas. Some having potentially better outcomes than others! Watching this thread closely to see what it turns out to be.
     
  4. sandlapper

    sandlapper Veteran Member

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    most Torque Converters have a centered male pilot "nub" which mates into rear of crank ... you'll have to pull TC / trans back a little to decouple. But trans is what holds rear of motor up; without trans OR without support under oil pan w/ wood block & jack, motor'll likely droop and may damage ign distributor.

    Often, flexplates crack around-within center bolt circle pattern; can be difficult to identify in-car. Better to view on bench w/good light.

    let's all hope your noise is something as innocuous $ as cracked flexplate or slipped harmonic balancer.
    :bowtie:
     
  5. sandlapper

    sandlapper Veteran Member

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    yup. That could be it as well. Slipping outer ring rubbing on timing cover.

    Quick N easy to verify ... check that First ultimatez.
     
    Last edited: Feb 20, 2021
  6. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    i've had that happen. it will slice through the timing cover pretty quick. should be rather noticeable.
     
  7. 1320feet

    1320feet Veteran Member

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    Is there a chance you over reved it just before this happened? I'm thinking you maybe pinched a rod bearing. What rods are in there?
     
  8. flht99b

    flht99b Veteran Member Gold Member

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    Does the engine run roller lifters? I've heard a similar sounds from a roller lifter that the roller is seizing.
     
  9. ULTM8Z

    ULTM8Z Veteran Member

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    It's just a factory ZZ4 short block.
     
  10. ULTM8Z

    ULTM8Z Veteran Member

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    Yep, the factory ZZ4 lifters.
     
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