Re Harmonic Balancer
Melting Slicks
Joined: Oct 2015
Posts: 3,299
Likes: 769
From: Mead Wash
2020 C6 of the Year Finalist - Modified
C6 of Year Finalist (appearance mods) 2019
Balancer
Not sure what only 4 months has to do with it, been building street rods and muscle cars for over 50 years! Happen to have just done my balancer (myself) after a ton of research. Shame on me for not knowing that LS1's and LS3's had the same issue. Was only interested in Corvettes with LS2's. I'll certainly try to be more informed before posting again.
Pro
Joined: Feb 2021
Posts: 729
Likes: 317
From: Ashevile, NC
Thought for sure I had read somewhere along the line that GM had fixed the problem. Hard to imagine after they knew of it early on that they wouldn't have done something about it!! Could have and should have created a HUGE recall wouldn't you think !!! Easier to just say "it's in spec" I suppose!!!
Drifting
Joined: Apr 2016
Posts: 1,286
Likes: 611
From: DFW Texas
Information on GM parts lookup for the balancer below. Specifies this is a "2nd Design" with a replacement part number. As I stated in an earlier post, GM did provide a redesign HOWEVER I do not necessarily trust the GM part....
SKU:12674582
Hope everyone enjoyed their holiday and was able to get out and drive their cars!
GD
SKU:12674582
- Other Names:Balancer
- Description:SS. G8. 6.2l. Caprice PPV. Corvette. 6.2l. G8. 6.0l. 2nd design. Without supercharged. Without supercharger. 6.0 & 6.2L, 6.0L, 2nd design.
Hope everyone enjoyed their holiday and was able to get out and drive their cars!
GD
Melting Slicks
Joined: Oct 2015
Posts: 3,299
Likes: 769
From: Mead Wash
2020 C6 of the Year Finalist - Modified
C6 of Year Finalist (appearance mods) 2019
Need more information. LS2 or LS3 ? 6.0 or 6.2 Powerbond 1117SS from Rock Auto. ARP bolt # 234-2503. Don’t forget a new front seal. There, I did my good deed for the day.
Last edited by 2008 Corvette; Jun 4, 2021 at 10:29 AM.
Pro
Joined: Aug 2011
Posts: 506
Likes: 57
From: New York
The HB should be considered preventive maintenance.
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Thread Starter
Instructor
Joined: May 2021
Posts: 160
Likes: 63
From: Los Angeles
Just wanted to update, I took the cautious route and ended up parking the car for the past few weeks until this weekend, here is the old OEM harmonic balancer and glad I didn’t drive it much, as you can see the rubber connecting the outer and inner was more than half torn/worn.
and here is the ATI unit with ARP bolt.
Special thanks to the expert Edwin and his son Angel getting it done in less than 3 hours.
and here is the ATI unit with ARP bolt.
Special thanks to the expert Edwin and his son Angel getting it done in less than 3 hours.
Pro
Joined: Feb 2021
Posts: 729
Likes: 317
From: Ashevile, NC
It certainly didn't look that bad in your earlier video and look what you discovered! As someone stated no wobble is acceptable and you certainly could have had a catastrophic failure by the looks of that. Bet you're glad you changed it!!
Last edited by rbwinston; Jun 19, 2021 at 07:00 PM.
Thread Starter
Instructor
Joined: May 2021
Posts: 160
Likes: 63
From: Los Angeles
Yeah I felt mostly confident driving it with the wobble after seeing all the comments here and the wobble not looking so bad, but I still had a tiny gut feeling that I decided to trust and park it until I replaced it, especially since we have two other cars I could drive daily. Very glad I trusted the gut feeling because the factory balancer was in very bad shape, more than half the rubber was ripped and worn. With it now replaced I can enjoy it as my daily driver now.
Racer
Joined: Nov 2019
Posts: 427
Likes: 142
From: Kingman AZ
Yeah I felt mostly confident driving it with the wobble after seeing all the comments here and the wobble not looking so bad, but I still had a tiny gut feeling that I decided to trust and park it until I replaced it, especially since we have two other cars I could drive daily. Very glad I trusted the gut feeling because the factory balancer was in very bad shape, more than half the rubber was ripped and worn. With it now replaced I can enjoy it as my daily driver now.
Having mine replaced on Tuesday.
Thread Starter
Instructor
Joined: May 2021
Posts: 160
Likes: 63
From: Los Angeles
Instead steering rack, the installer dropped the front suspension. No mention of any alignment needed and I've been driving it and it feels fine, but I had planned on a alignment anyways regardless shortly after install. I'll update with numbers from the alignment shop if it was off afterwards.
Race Director
Joined: Jul 2007
Posts: 17,750
Likes: 1,210
From: Aiken, SC
St. Jude Donor '13 thru '26
Thread Starter
Instructor
Joined: May 2021
Posts: 160
Likes: 63
From: Los Angeles
Just wanted to update, I took the cautious route and ended up parking the car for the past few weeks until this weekend, here is the old OEM harmonic balancer and glad I didn’t drive it much, as you can see the rubber connecting the outer and inner was more than half torn/worn.
Racer
Joined: Nov 2019
Posts: 427
Likes: 142
From: Kingman AZ
They can get considerably worse in a short amount of time. I had a slight wobble about 5000 miles ago, looked at it when I changed my oil. Next time I checked it, it had a pretty bad wobble going on, but surprisingly wasn't making any belt noise. Took it to a shop with LS experience and he said it was getting pretty bad, had seen worse, but I need to do it ASAP.
Thread Starter
Instructor
Joined: May 2021
Posts: 160
Likes: 63
From: Los Angeles
They can get considerably worse in a short amount of time. I had a slight wobble about 5000 miles ago, looked at it when I changed my oil. Next time I checked it, it had a pretty bad wobble going on, but surprisingly wasn't making any belt noise. Took it to a shop with LS experience and he said it was getting pretty bad, had seen worse, but I need to do it ASAP.
Just wanted to update, I took the cautious route and ended up parking the car for the past few weeks until this weekend, here is the old OEM harmonic balancer and glad I didn’t drive it much, as you can see the rubber connecting the outer and inner was more than half torn/worn.
and here is the ATI unit with ARP bolt.
Special thanks to the expert Edwin and his son Angel getting it done in less than 3 hours.
and here is the ATI unit with ARP bolt.
Special thanks to the expert Edwin and his son Angel getting it done in less than 3 hours.
Burning Brakes
Joined: Jan 2011
Posts: 827
Likes: 65
The belts started chirping in my 2007 Z06 so I confirmed the balancer wobble, and had a shop replace it with a Power Bond PB1503SS unit, along with the front seal, belts, both tensioners, and bolt. After my first track day, the A/C belt was thrown and after that was fixed, I discovered a front main seal leak after the second track day. All parts used (except balancer) were GM.
It sounds like what happened to Toxic, and he indicated possible pinched main seal.......would that indicate an installation issue? Is there an issue with the Power Bond units?
I don't want to go in there again so any suggestions would be appreciated.
btw, Toxic, how did you end up resolving your issue?
It sounds like what happened to Toxic, and he indicated possible pinched main seal.......would that indicate an installation issue? Is there an issue with the Power Bond units?
I don't want to go in there again so any suggestions would be appreciated.
btw, Toxic, how did you end up resolving your issue?
Last edited by harrydirty; Jul 12, 2021 at 02:31 PM.
Pro
Joined: Feb 2021
Posts: 729
Likes: 317
From: Ashevile, NC
Never heard of an issue with any new replacement HB. Problem would almost have to be with the installation or just simply a defective seal. Unfortunately, you're going to have to go in there again as there's no other option (assume you're sure it's the front seal and not something else leaking). If you think about it, for it to be the HB itself it would have to be badly grooved or wobbling terribly to create a leak. Do you know if the installer put gasket seal on the outside of the new seal and lubricate the HB before inserting it into the seal?? Lack of either could possibly create a leak. Please keep us updated.