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  Mustangsandmore Forum Archive
  '64 1/2 to '68 1/2 -- The Classic Mustang
  Can you test a harmonic balancer?

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Author Topic:   Can you test a harmonic balancer?
Fastback68
Gearhead

Posts: 4511
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 09-29-2002 07:18 PM     Click Here to See the Profile for Fastback68        Reply w/Quote
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

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 09-29-2002 07:50 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
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

Fastback68
Gearhead

Posts: 4511
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 09-29-2002 09:29 PM     Click Here to See the Profile for Fastback68        Reply w/Quote
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!

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 09-29-2002 09:36 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
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

Pierre
Gearhead

Posts: 661
From: Near Paris, France
Registered: Apr 2002

posted 09-30-2002 01:06 PM     Click Here to See the Profile for Pierre        Reply w/Quote
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

Pierre
Gearhead

Posts: 661
From: Near Paris, France
Registered: Apr 2002

posted 10-01-2002 06:58 AM     Click Here to See the Profile for Pierre        Reply w/Quote
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

Pierre
Gearhead

Posts: 661
From: Near Paris, France
Registered: Apr 2002

posted 10-01-2002 07:31 AM     Click Here to See the Profile for Pierre        Reply w/Quote
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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