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Harmonic balancer slipped?

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Old Feb 13, 2008 | 01:08 PM
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Harmonic balancer slipped?

  • My truck is running good, but it has a slight vibration at idle I can't tune out.
  • The timing mark on the harmonic balancer is approx. 180 degrees out from the timing tab.
  • The timing light is functioning correctly and the probe was hooked up to the #1 cylider
  • The rubber on the balancer looks fine.
  • How can I tell if the harmonic balancer slipped?
Thanks
 
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Old Feb 13, 2008 | 01:09 PM
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I forgot, this is a 1984 F150- 351W
 
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Old Feb 13, 2008 | 02:07 PM
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Sounds like your distributor is 180 degrees out. Has it been out recently?
 
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Old Feb 13, 2008 | 02:19 PM
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I bought the truck about 1 year ago and never checked the timing. The distributor has not been touched. I do know that the previous owner had a "rv" cam put in the truck a couple of years ago.. I didn't think the truck would run with the distributor 180 degrees out. would it? Truck has great power.
 
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Old Feb 14, 2008 | 12:02 AM
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I'd drive to a junk yard and look for a vehicle with the same balancer to compare.
 
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Old Feb 14, 2008 | 05:37 AM
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If the light is off and it's got a shake to it, the balancer ring has slipped. Pretty common thing for those year model Fords. Have a friend with a 94 GT Stang that had one slip.
 
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Old Feb 14, 2008 | 08:42 AM
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Thanks

I'll pick up a balancer from the junk yard this weekend and try it out. I appreciate the help!
 
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