Harmonic Balancer Wobble

Tech discussions on the L77 6.0L V8.
smwalker
Administration Staff
Posts: 2201
Joined: Mon Jul 29, 2013 1:44 am
Location: Azusa,CA

Re: Harmonic Balancer Wobble

Post by smwalker »

elc32955 wrote:Mine was at least that bad if not worse. I wouldn't AutoX or track it like that, but routine stop-n-go shouldn't be a problem for a few days I would think. Final decision is yours though :)
Did they do a new belt at the time of replacement? Does the wobble eat it up?
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White
User avatar
elc32955
System Manager
Posts: 2718
Joined: Thu Nov 29, 2012 10:32 am
Location: East Central Florida
Contact:

Re: Harmonic Balancer Wobble

Post by elc32955 »

I'm wanting to say No and No, but I'm going by memory over 3 years back. Not completely sure to either....
System Manager and your tour guide for the day. 2015 Caprice w/LFX, former NC DPS staff car. Partial hybrid G8/SS/Camaro SS interior mods, SS MyLink radio upgrade, 2016 Camaro V6 rims, GMPP Malibu chrome exhaust tips, otherwise bone stock for now.
User avatar
bsparks72
Posts: 284
Joined: Tue Jan 20, 2015 9:29 pm
Location: Katy, Tx

Re: Harmonic Balancer Wobble

Post by bsparks72 »

Mine was pretty bad, and who knows for how long and it didn't eat the belt. I replaced the belt anyway.
-Brandon
2012 9C1 L77 - 228/234, .604/.609 112 cam, JBA shorty headers, Solo high-flow cats, X-pipe, Cherry Bomb single-chamber mufflers (Frankenstein exhaust), Roto-Fab CAI, CTS-V torque converter, 3.45 Camaro diff, G8 red/black seats/steering wheel
User avatar
yargnits
Posts: 277
Joined: Fri Dec 04, 2015 10:36 am
Location: Northern Indiana

Re: Harmonic Balancer Wobble

Post by yargnits »

UPDATE: Just got my car back from the dealer and it couldn't have went smoother. They looked at it on Wednesday, made an appointment for this morning, back to me by lunch. Covered by the drivetrain warranty.

The service guy said he had the old unit in his hand and said the 2 parts of the balancer moved by hand.
Dave B - Yargnits
--
2011 Caprice 9C3
2018 Silverado LT
2005 John Deere (garden tractor)
User avatar
elc32955
System Manager
Posts: 2718
Joined: Thu Nov 29, 2012 10:32 am
Location: East Central Florida
Contact:

Re: Harmonic Balancer Wobble

Post by elc32955 »

WIN for the good guys :) Did they give you a reason why they him-hawed around with it in the first place? It should have been warranty all the way, no brainer there.
System Manager and your tour guide for the day. 2015 Caprice w/LFX, former NC DPS staff car. Partial hybrid G8/SS/Camaro SS interior mods, SS MyLink radio upgrade, 2016 Camaro V6 rims, GMPP Malibu chrome exhaust tips, otherwise bone stock for now.
User avatar
95_9C1
Posts: 89
Joined: Mon Apr 22, 2013 2:54 am
Location: California

Re: Harmonic Balancer Wobble

Post by 95_9C1 »

I started hearing crickets.

My wobble is worse than in Yargnits's video, and I have no idea how long I've had this wobble. The chirping started about a month ago.

I am well out of warranty.

Should I bother trying to get a dealer to fix it?

If not, what's the best replacement part?

I see p/n 12635649 on Amazon for $130:

http://www.amazon.com/ACDelco-12635649- ... B004AFGN4I
smwalker
Administration Staff
Posts: 2201
Joined: Mon Jul 29, 2013 1:44 am
Location: Azusa,CA

Re: Harmonic Balancer Wobble

Post by smwalker »

I think the aftermarket is the better alternative for these. Although it is twice the price, make up for it by not replacing every few years. Just make sure and get the factory size and not an under drive unit.
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White
CrashTestDummy
Posts: 2300
Joined: Sat Feb 07, 2015 2:31 pm
Location: Pearland, Texas

Re: Harmonic Balancer Wobble

Post by CrashTestDummy »

Why not an underdrive unit? Unless you spend a LOT of time strictly at idle, I can't see an issue with one. We have one on our 96 SS, and while the lights do dim a bit at idle, we suffer no other problems, and it helps free up some HP. We bought it like that, and have probably put 50K miles of DD use on it with absolutely no issues.
Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2018 Tahoe PPV (her car)
1995 DGGM Impala SS
1985 Firebird - 310 LS1 C Prepared autocross car.
1980 Bluebird Wanderlodge
And some others
Do YOU have my SPID?
User avatar
yargnits
Posts: 277
Joined: Fri Dec 04, 2015 10:36 am
Location: Northern Indiana

Re: Harmonic Balancer Wobble

Post by yargnits »

I agree with an aftermarket underdrive pully. If I had been out of warrentee I was going see if SLP had a unit that would fit.
Dave B - Yargnits
--
2011 Caprice 9C3
2018 Silverado LT
2005 John Deere (garden tractor)
User avatar
95_9C1
Posts: 89
Joined: Mon Apr 22, 2013 2:54 am
Location: California

Re: Harmonic Balancer Wobble

Post by 95_9C1 »

I found this thread on the G8 board:

http://www.g8board.com/forums/5-v8-engi ... stall.html

ATI Super Damper (stock size) #917246 @ $445

This chart gives the available options:

http://www.atiracing.com/products/dampe ... amserp.htm

The 10% under size with AC looks to be #917278 @ $452

I haven't found any part numbers to help acquire the smaller belts needed for the under size pulleys.

I've heard blemished ones show up on eBay, from time to time, for much less...
Post Reply