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Old Jul 8, 2014 | 07:24 PM
  #21  
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Originally Posted by hgoodwiniii
Thanks. Mine has them. The thing about it is that I'm sure the outer and inner hubs of my balancer slipped when the balancer split apart and the original balancer position relative to the crankshaft can't be determined.
Are you saying that your balancer center section slipped on the crank ? If so ,you may have other issues . However , if not then the worst that can happen with a new neutral balance hub is to get a mild vibration . The crank and associated components should be very close to begin with .
One of my mechanic buddies calls that balancer a glorified pulley , as it does not really do any balancing . Via this forum, it has been stated that the manual trans car is the only one needing any weight added at the factory . And that is because the manual trans combo seems to amplify any vibes in the drivetrain .The auto trans car seems not to need the finer balance tuning . This being the case , If you do get a vibration that you just cannot tolerate , you can go to a good vette shop and have them use a eva vibration analyzer tool ( j-38792 ). Or they can mark the pulley ,add weights , run the car and test it . Then relocate the weight till it ends up in a place where it makes the engine smooth out . I have been working with Atlanta corvette the last few days on mine . They have been very nice to me so far, though they were not familiar with either the tool or any vibe troubles . Or at least that's what they said . In any case, consulting others like we both are doing is a wise move .I wish you well with your vette bro.
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Old Jul 8, 2014 | 07:40 PM
  #22  
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Originally Posted by thbwlZ
it's unfortunate there is so much "back and forth" conflicting information on here and everywhere. There is only one actual situation. IF your vette has a manual transmission from the factory, it is a FACT that it went through a final post assembly "hot balance" procedure. Weights were added, AS REQUIRED (read: some engines had weights added, some did not) to either the front damper, the Flywheel, or both in order to bring the total engine assembly balance down to within 0.5 oz∙in at both the front and rear planes. That is an incontrovertible fact. It is YOUR CHOICE if you choose to maintain that factory balance when you replace your damper or clutch assembly. The engines are fine "as assembled" and the final hot balance procedure is done for NVH purposes to minimize unwanted vibrations.

and how many holes are you counting? holes to receive balance weights are through holes. Holes drilled into the face for balancing the damper BY ITSELF are blind holes. the through holes are a symmetrical pattern. The blind holes are wherever they were needed to bring the damper by itself into balance within the manufacturer's spec. You wouldn't put a balance weight into one of the blind holes, only a through hole. Most aftermarket dampers do not have the thru holes to accept balance weights.
Thanks for the information . Guys like myself could not get by very well with cars like these , without others like your self being willing to share their very valuable insights !
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Old Jul 8, 2014 | 09:09 PM
  #23  
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Bill Curlee
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I installed a new Power bond dampener on my 02 ZO6. It did NOT have any place to add weights. I did however pay very close attention to the flywheel as it hd ONE added weight. i marked the relation to the old flywheel to the crank and had the NEW flywheel MATCHED BALANCED to the old flywheel.

I have NO vibration issues.

trpl7man

I GOOGLED "rotating machinery balancing in Atlanta GA" and came up with this:

https://www.google.com/search?source...+in+Atlanta+GA


Take a look through all the info , give them a call and see if they can provide a service.

Let us know what you find and how it turns out.

Good Luck

Bill
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Old Jul 9, 2014 | 08:45 AM
  #24  
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No no. I'm saying the balancer center "possibly" slipped it's position from the drive belt pulley that it was bonded to. I say that because the engine was running when the balancer/pulley split apart. I've seen this happen with these 2 peice harmonic balancer/pulley setups after about 100,000 miles on other vehicles, as well. There is a material that I guess seals the pulley to the harmonic balancer. That seal gave way. No problem with the balancer center slipping on the crankshaft.

Not sure I see an difference in the type of holes in the OEM balancer. The holes I am counting are sitting on the face of the harmonic balancer setup in the pulley area just below the belt grooves.

I agree wtih trpl7man. The forum has been invaluable in helping with all the ins/outs of maintaining these cars. I certainly would not have been able to get through it over the years without it.

Last edited by hgoodwiniii; Jul 9, 2014 at 08:48 AM.
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Old Jul 9, 2014 | 08:54 AM
  #25  
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From: suwanee ga
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Originally Posted by Bill Curlee
I installed a new Power bond dampener on my 02 ZO6. It did NOT have any place to add weights. I did however pay very close attention to the flywheel as it hd ONE added weight. i marked the relation to the old flywheel to the crank and had the NEW flywheel MATCHED BALANCED to the old flywheel.

I have NO vibration issues.

trpl7man

I GOOGLED "rotating machinery balancing in Atlanta GA" and came up with this:

https://www.google.com/search?source...+in+Atlanta+GA


Take a look through all the info , give them a call and see if they can provide a service.

Let us know what you find and how it turns out.

Good Luck

Bill
Thanks very much for your time and efforts . Unfortunately , I did not see anything in the automotive market on the link provided .However , What I have done is to go to Atlanta Corvette ( dealership ) &" Buy a vette" ( shop across the street )and ended up educating them with the info. off of this forum ! They have been very nice and helpful . I have spoken to the tech. there that did my clutch swap as well . He understands completely what " We the forum " are saying , and is more than willing to help out . Apparently the whole vibe issue is not exactly common , but does occur occasionally . So, if you are ever having this type of trouble , you may consider coming to Buyavette in Atlanta for help , if you can not find a shop to help you in your area . I have also suggested to them that they become supporting members of Corvette forum .
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