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Author
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Topic: Can you test a harmonic balancer?
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Fastback68
Gearhead Posts: 4511
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 09-29-2002 07:18 PM
 
I'm trying to trace a vibration. Is there any way to test if the elastic polymer (?) inside a harmonic balancer has gone hard or not? New ones aren't cheap, so I don't really want to buy one just to find out that wasn't ther problem.
Thanks!
Simon
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 09-29-2002 07:50 PM
Aside from the visual check, you can verify TDC at #1.You can have the Damper Doc rebuild your old one for about $56. They did one for me and it came out great. {I'm not sure about the shipping to the Phillippines, though} http://members.aol.com/damperdoc/ ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
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Fastback68
Gearhead Posts: 4511
From: Sucat, Paranaque, Philippines
Registered: Jul 99
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posted 09-29-2002 09:29 PM
Oh dear, I can't get my grey matter around this. How do you do a visual check on a balancer? And how does verifying TDC help tell if the balancer's gone solid? And before you sent your balancer to the Doc, were you sure it was no good? How did you know?
Thanks again!
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SteveLaRiviere
Administrator Posts: 48752
From: Saco, Maine
Registered: May 99
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posted 09-29-2002 09:36 PM
You check the rubber for cracking, {they almost always are} and you see if the timing mark has moved, which you assume the outer ring has slipped on the hub {as opposed to it having been made that way}.To me, this is one of those things I usually assume has worn just because of it's age. Ozone loves rubber. You also check the seal mating area for grooving. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150
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Pierre
Gearhead Posts: 661
From: Near Paris, France
Registered: Apr 2002
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posted 09-30-2002 01:06 PM
quote:
Originally posted by Fastback68:
I'm trying to trace a vibration. Is there any way to test if the elastic polymer (?) inside a harmonic balancer has gone hard or not? New ones aren't cheap, so I don't really want to buy one just to find out that wasn't ther problem.
Thanks!
Simon
I've got a great book from Tom MONROE, "How to rebuild your SB", in which he describes a basic test to do that, I will read again tonight and get back to you tomorrow 
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Pierre
Gearhead Posts: 661
From: Near Paris, France
Registered: Apr 2002
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posted 10-01-2002 06:58 AM
Hope you didn't hold your breath on this one !! This is not rocket science:
Tommy says: holding the exterior part of the damper, try to rock it side to side & front to back. If any motion is felt/seen, damper is shot.If you want I've got my old damper here that's in good shape (4 bolt, 28 Oz, 1971), I'll give it to you if you pick-up the shipping cost (France to Philippines  )
I replaced it when I had vibrations (with a fluidamper) and it wasn't the problem  Let me know
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Pierre
Gearhead Posts: 661
From: Near Paris, France
Registered: Apr 2002
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posted 10-01-2002 07:31 AM
Now that I think about it, we assumed that you have a small block, but based on your description this may be a big block damper ?In that case I do not know the answer !!
Sorry
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