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Harmonic Balancer flew apart

Old 05-20-2019, 12:09 PM
  #1  
LaBelle
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Join Date: Nov 2013
Location: Washington
Posts: 45
Default Harmonic Balancer flew apart

While going thru drive-up at a local burger joint,,, the engine made a loud thump, power steering and air conditioner quit. I pulled out of the line and pulled over to a parking spot , and found the outside half of the harmonic balancer laying on the subframe. The belt had somehow re-installed its self around the rest of the pulley allowing me to at least drive back home, slowly. I got it to the ford dealer the next day and they installed a new one for way too much money.
Ever I have owned the car,, there has been a slight vibration beginning at 69 mph, and lasting till 71 mph. I didnt notice this when I purchased the car because,, well,, city police dont like people doing 70 thru town for some reason..
Anyway, I had hoped that the harmonic balancer was to blame for the vibration, but unfortunately, it wasn't , so now I am looking at a new driveshaft..
It is strictly speed related not rpm related. I have downshifted out of overdrive , keeping rpms the same and vibration goes away, tires have been rebalanced and rotated, no help.
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Old 05-20-2019, 12:10 PM
  #2  
LaBelle
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sorry 08 convertible 4.0l auto
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Old 05-20-2019, 01:18 PM
  #3  
Derf00
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how do you know for certain it's the driveshaft and not the motor or trans mounts or a tire/wheel that is slightly out of balance?
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Old 05-21-2019, 11:30 PM
  #4  
LaBelle
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short answer, been there done that
Tranny service in April with new mount also
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