Pulley issues
Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 1,079
Likes: 0
From: Richmond VA
Pulley issues
Well, I noticed a squeak coming from my engine bay this past weekend, and it looks as if my Harmonic balancer/crankshaft pulley is wobbling and will need to be replaced. I just spoke to my shop and got quoted $800 to have it replace - $300 less than dealer so I am not complaining too bad.
My question for the forum: what else should I have done performance or preventative maintenance while my mechanic is in there? Should I go with an aftermarket underdrive pulley (SLP?) or stick with stock? This is a very new area to me so any recommendations are welcomed.
My question for the forum: what else should I have done performance or preventative maintenance while my mechanic is in there? Should I go with an aftermarket underdrive pulley (SLP?) or stick with stock? This is a very new area to me so any recommendations are welcomed.
Tolero Apto Victum
Joined: Jul 2007
Posts: 9,669
Likes: 37
From: Woodlands TX
Sir, check out these threads:
http://forums.corvetteforum.com/c6-c...ose-gotem.html
http://forums.corvetteforum.com/c6-t...-versions.html
http://forums.corvetteforum.com/c6-t...ould-i-do.html (Please read 7th post from the top). These guys know their stuff!!!
http://forums.corvetteforum.com/c6-c...ose-gotem.html
http://forums.corvetteforum.com/c6-t...-versions.html
http://forums.corvetteforum.com/c6-t...ould-i-do.html (Please read 7th post from the top). These guys know their stuff!!!
Race Director
Joined: Sep 2006
Posts: 11,175
Likes: 1,138
From: Santa Rosa Beach FL
read read read
Recommend you visit the your C6 TECH section or advance search there. This is a carry-over problem from C5. Would be good for you to specify what year you got.
Here's some from C5 TECH that will get you going in the right direction. Then follow up on C6 Tech:
http://forums.corvetteforum.com/show....php?t=2588426
http://forums.corvetteforum.com/show....php?t=2499451
http://forums.corvetteforum.com/show....php?t=2616391
Bill Curlee, Lucky, & 8Vette7 posts need your attn.
Avoid ASP (result in early timing chain failure)
Powerbond (Made in Australia) is a popular choice
ARP bolt w/correct torque procedure w/moly lube not loctite is suggested
Stock bolt is torque to yield meaning it can only be stretched once
Do not re-use stock bolt
OEM bolt for C6 has been changed. New one has diamond grit that digs into balancer once torqued down.
GM tensioners fail early t=2235343
Here's some from C5 TECH that will get you going in the right direction. Then follow up on C6 Tech:
http://forums.corvetteforum.com/show....php?t=2588426
http://forums.corvetteforum.com/show....php?t=2499451
http://forums.corvetteforum.com/show....php?t=2616391
Bill Curlee, Lucky, & 8Vette7 posts need your attn.
Avoid ASP (result in early timing chain failure)
Powerbond (Made in Australia) is a popular choice
ARP bolt w/correct torque procedure w/moly lube not loctite is suggested
Stock bolt is torque to yield meaning it can only be stretched once
Do not re-use stock bolt
OEM bolt for C6 has been changed. New one has diamond grit that digs into balancer once torqued down.
GM tensioners fail early t=2235343
Tolero Apto Victum
Joined: Jul 2007
Posts: 9,669
Likes: 37
From: Woodlands TX
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Thread Starter
Burning Brakes
Joined: Sep 2000
Posts: 1,079
Likes: 0
From: Richmond VA
Burning Brakes
Joined: Sep 2010
Posts: 1,109
Likes: 0
From: Huntsville Alabama
If you don't mind me asking, can someone post a pic of what the harmonic balancer looks like. I have a squeak also on 2010 GS with 1200 miles on it. I don't mean to hijack your thread but we may have the same issue and I don't want to have two threads going about the same thing.
Race Director
Joined: Sep 2006
Posts: 11,175
Likes: 1,138
From: Santa Rosa Beach FL
read read read
Find me above and click the links. Bill Curlee has pics.
I learned more abt this issue after doing Tech research. Had a visible wobble but mine is only from the rubber protruding. The elastic rubber bonds the outer ring and inner hub as one unit. Even a brand new OEM will have uneven rubber seal around the HB a.k.a damper.
Once that elastic bond is history, the outer ring can walk forward or backwards causing a visible wobble on the metal parts. By painting a stripe on the front of the damper across all three portions you can easily see if the outer ring is separating from the rest. You will also see misalignment wear & sometimes the belt will walk off the pulley.
It's prone to failure and worth keeping an eye on C5 & C6.
btw: I myself would not replace it w/25% under drive damper. The PS somewhat cuts back right @ idle and may suddenly become harder to turn catching you off guard. Go for the stock size or 10% under driven. Source is t=2568725
I learned more abt this issue after doing Tech research. Had a visible wobble but mine is only from the rubber protruding. The elastic rubber bonds the outer ring and inner hub as one unit. Even a brand new OEM will have uneven rubber seal around the HB a.k.a damper.
Once that elastic bond is history, the outer ring can walk forward or backwards causing a visible wobble on the metal parts. By painting a stripe on the front of the damper across all three portions you can easily see if the outer ring is separating from the rest. You will also see misalignment wear & sometimes the belt will walk off the pulley.
It's prone to failure and worth keeping an eye on C5 & C6.
btw: I myself would not replace it w/25% under drive damper. The PS somewhat cuts back right @ idle and may suddenly become harder to turn catching you off guard. Go for the stock size or 10% under driven. Source is t=2568725
Intermediate
Joined: Jul 2010
Posts: 45
Likes: 2
I have a 2010 and had a pulley squeak problem. First time they changed the belt. Next time they changed the pulley. Last time they changed the belt to a Gatorback, based on forum advice, and it has not squeaked since. I had to tell the dealer to try this.
Burning Brakes
Joined: Mar 2010
Posts: 914
Likes: 2
From: Newnan Georgia
Looks like my balancer change will be including some extra toys. 
I figured since I was going in, I might as well go all the way in.
I'll be swapping my cam for a Vengeance VRX5, putting in a new roller timing set, Yella Terra roller rockers, Patriot Gold dual springs w/titanium retainers and Trick Flow pushrods. As far as balancers, I think I'm going to go with a Powerbond underdrive. I like the ATI's, just worried about the rebuild requirement.
Since I'll be doing the work myself, I can get just about all of the parts for what it would cost me to have someone do just the balancer.
Here's a link to a great "How To" for the cam replacement, it could be used for just the balancer replacement too. Not sure who put this together, but I'm sure glad they did!!!
Cam Replacement "How To"
D
I figured since I was going in, I might as well go all the way in.
I'll be swapping my cam for a Vengeance VRX5, putting in a new roller timing set, Yella Terra roller rockers, Patriot Gold dual springs w/titanium retainers and Trick Flow pushrods. As far as balancers, I think I'm going to go with a Powerbond underdrive. I like the ATI's, just worried about the rebuild requirement.Since I'll be doing the work myself, I can get just about all of the parts for what it would cost me to have someone do just the balancer.
Here's a link to a great "How To" for the cam replacement, it could be used for just the balancer replacement too. Not sure who put this together, but I'm sure glad they did!!!
Cam Replacement "How To"
D
