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Harmonic Balancer idea?

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Old Jun 16, 2025 | 03:04 PM
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Default Harmonic Balancer idea?

First post, new C5 owner as of Saturday!

So before buying I have heard all about the balancers in our cars. Being rubber, and knowing that o-rings can be glued with CA (superglue) I was thinking this could be a preventative measure for owners with an OEM balancer.

the idea is to remove the belt and flood the rubber ring on the balancer with CA. It should flow into any breaks in the factory adhesive in say a lower mileage car with a 25 year old balancer that’s still ok. This might stave off complete failure for a while. I was thinking as a preventative measure.

thoughts?

Here she is 2001, 55,000 miles balancer is still good. Look at those crystal clear DRL lenses and headlights. Car has never seen the sun it seems!




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Old Jun 16, 2025 | 03:41 PM
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Originally Posted by Gorn Captain
First post, new C5 owner as of Saturday!

So before buying I have heard all about the balancers in our cars. Being rubber, and knowing that o-rings can be glued with CA (superglue) I was thinking this could be a preventative measure for owners with an OEM balancer.

the idea is to remove the belt and flood the rubber ring on the balancer with CA. It should flow into any breaks in the factory adhesive in say a lower mileage car with a 25 year old balancer that’s still ok. This might stave off complete failure for a while. I was thinking as a preventative measure.

thoughts?

Here she is 2001, 55,000 miles balancer is still good. Look at those crystal clear DRL lenses and headlights. Car has never seen the sun it seems!


A poor choice for an assembly that will be subject to temperature cycling and vibration. Cyanoacrylate is brittle. O-rings need to conform, not sure why you would use a brittle adhesive on a material that needs to be compliant to the geometry and temperature.
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Old Jun 16, 2025 | 03:59 PM
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Originally Posted by lucky131969
A poor choice for an assembly that will be subject to temperature cycling and vibration. Cyanoacrylate is brittle. O-rings need to conform, not sure why you would use a brittle adhesive on a material that needs to be compliant to the geometry and temperature.
HVAC guys use CA on o rings without issue. That’s why. There’s videos on it by professional HVAC guys and one actually showed a professional o-ring set from a supplier that included a tube of CA and instructions to the user on how to make an oring fit if it’s an odd aize or whatever.

I’m not talking about a broken wobbling balancer, I’m talking about an old still functioning balancer and closing any gaps.

sure ca is brittle, however it would be a micro layer wicked between the steel and rubber. It would either work or it won’t. Either way, it won’t hurt anything. If the balancer is going to fail, it’s going to fail.

video about o-rings.

https://youtu.be/PzTbSLbTr60?si=qyhey7tloW7-ARbW
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Old Jun 16, 2025 | 04:01 PM
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Originally Posted by Gorn Captain
HVAC guys use CA on o rings without issue. That’s why. There’s videos on it by professional HVAC guys and one actually showed a professional o-ring set from a supplier that included a tube of CA and instructions to the user on how to make an oring fit if it’s an odd aize or whatever.

im not talking about a broken wobbling balancer, im talking about an old still functioning balancer and closing any gaps.

sure ca is brittle, however it would be a micro layer wicked between the steel and rubber. It’s would either work or it won’t. Either way, it won’t hurt anything.
Go for it.
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Old Jun 16, 2025 | 04:02 PM
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Leave it alone and replace the harmonic damper when it is necessary. Removing and re-installing the damper is not that difficult, I've done it on all three C5s that I've owned for various reasons.
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Old Jun 16, 2025 | 04:08 PM
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lol.

watch in case you ever need a smaller oring and have one that’s too big.

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Old Jun 16, 2025 | 10:56 PM
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So turn it into an unbreakable unharmonic unbalanced undamper? You could replace a fluidampr's fluid with superglue too. But what would you have?
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Old Jun 16, 2025 | 11:18 PM
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I can't say that it sounds like a great idea to me but it doesn't sound worse than continuing to use one that you can tell is near failure. I would definitely look at the rubberized CA glues like
this this
.
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Old Jun 17, 2025 | 12:51 AM
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Originally Posted by CFight
So turn it into an unbreakable unharmonic unbalanced undamper? You could replace a fluidampr's fluid with superglue too. But what would you have?
huh?

so you don’t think that the rubber in there has adhesive from the factory? Do ya think it’s just sitting jammed between the hub and pulley? Ffft.

unbalanced? If you read what I said instead of jumping to conclusions you’d see that I said do it before you see a problem.

y’all are rude in here.

Last edited by Gorn Captain; Jun 17, 2025 at 01:00 AM.
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Old Jun 17, 2025 | 12:54 AM
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Last edited by Gorn Captain; Jun 17, 2025 at 01:04 AM. Reason: Duplicate post
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Old Jun 17, 2025 | 09:30 AM
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Welcome and congrats on the new ride.

Interesting idea that I've never heard of but I get what you're going for. Thin CA is awesome that way and is pretty harmless until you get it on yourself. I'd say go for it....it's your car. Maybe you stumbled onto something of use.

Keep us updated?

FWIW, I'd almost bet my paycheck those headlights have almost never seen the sun
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Old Jun 17, 2025 | 09:49 AM
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I wouldn't do it without through testing. Just as much as you think you are solving an issue, you may be causing another unintended failure. There are many known failure points on our beloved C5's. Most of them you can just roll with the punches and solve as they pop up, if they pop up. It's likely if your damper has never seen any external chemicals and is in proper working order at this time, it may live many more years to come. FWIW, they typically do not just fall apart without warning or signs. Obviously the first easy sign to see is the axial runout becomes excessive. You could pop the hood and take a peak everytime you put fuel in it for peace of mind or just replace it now and forget about it.
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Old Jun 22, 2025 | 07:43 PM
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Every time I jump on some new shortcut it bites me on the ***.

Changing a dampener is not a big deal and then you are set for a long time. You might want to update some maintenance items while you're in there.

Good luck with your new car.

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