Morning guys!

The first of all, I have to present myself, I'm a guy from Madrid (Spain)who has a 05 Corvette ls2(with 20000kms -12500milles-) since early March. Sorry for the grammar mistakes .

I was in a mountain road for my first time with my vette, enjoying its maneuverability on fun roads, when...the harmonic balancer bolt was out ( now I know that was because When the last owner changed the harmonic balancer -he put dorman -,but he didn't change the screw...).

My trusted mechanic has repaired all, with new belts, thermostat, screw etc...but, he chose the ac delco, and it wobbles . And I don't know which I would choose now , I don't want to spend 1500€ on ATI ( of labor my mechanic is responsible by the error), because customs and shipping to Europe is not cheap... I think I must buy dorman again,

Please advice me

 

GM has been known for their balancers for years, most of us replace them with ATI as you said. Replacing with GMs will unfortunately put you in the same situation down the road...

 

I know, but I want to know if there is some model from other brand that works properly, like the dorman I said

 

you can buy a new ATI with cosmetic blemish for around $200. U.S. new for around $425. and buy an ARP crank bolt for $35.the ARP bolt is much easier to work with and can be reused if need be.contact ATI tech line at 410 298 4343 for availability including ARP crank bolt.what is 1500C in U.S. dollars.its well worth the few extra dollars for the ATI and not having to worry about it in the future.

 

https://www.hinsonsupercars.com/p-14...-pb1117ss.aspx

 

Is It better than the others not GM harmonic balancers??

 

Yes, it is better and not made by GM.

 

Thanks

 

Summit racing has many to choose from at good prices. i have a 2005 corvette with 25,000 miles and mine is starting to squeal I have a vortech supercharger on my car and this is the one I think I am going to go with 2005 CHEVROLET CORVETTE PowerBond Supercharger Performance Harmonic Balancers PBO81117SC10 10% overdrive and 8-rib $319.97. I havent heard nothing but good things about powerbond balancers. so best bang for my buck seems to be the powerbond.



2005 CHEVROLET CORVETTE PowerBond Premium OEM Replacement Harmonic Balancers PB1117N $73.97

2005 CHEVROLET CORVETTE PowerBond Race Performance Harmonic Balancers PB1117SS $222.97

2005 CHEVROLET CORVETTE Trick Flow® Track Max® Harmonic Dampers TFS-19005 $189.97

2005 CHEVROLET CORVETTE SLP Performance Underdrive Balancer Pulleys 100225 25% underdrive $211.95

 

Thanks!

I have to reflect... I don't know which I should buy, because.. What if that isn`t the problem?
These balancers should have a key to prevent rotation and help set correctly, and the oem bolt I think is a junk, because it doesn`t press the entire surface of the pulley and that can also facilitate wobble.
The apr bolt I don`t know if press the entire surface...

I also fear the possibility that the balancer with wobble, causes the screw out

 

GM pulley wobble has NOTHING to do with the bolt, unless its not installed correctly.

The GM pulley is 2 pieces held together with rubber that is bonded to both pieces. Over time this rubber wears out and the two halves now "wobble" and eventually come apart.

NOTHING to do with the bolt. The ARP bolt is re-usable and is a simple torque to spec bolt where as the GM bolt is a 1 time use only, torque to yield which requires torquing to angles, which is difficult at best for the DIY to do properly.

 

And the others pulleys? I think all the OEM parts are just like that

 

Totally different designs and different purposes. Most other pulleys on this motor are solid pulleys with a ball/roller bearing center(or there are bearings SOMEWHERE in the pump that a shaft is riding on). They arent trying to resist motion, simply transfer it. They have a torque spec(I want to say 37 ft. lbs. off the top of my head).

The harmonic balancer is trying to resist spinning on the crank. Its drawn onto the crank snout up against a shoulder machined into the crank. Then the bolt is installed and torqued to what equates to about 250ft. lbs. There is PLENTY of contact between the factory bolt head and the crank pulley. IMO more contact(or at least the same) as the ARP bolt replacement that everybody recommends. NOW, would I RATHER have a fully keyed crank with pulley, absolutely, and I bet the torque on the bolt would only be like 100ft. lbs, not 250ft. lbs, but nobody really knows.

The splined section on the crank snout drives the oil pump. The shoulder just in front of it is where the crank pulley gets drawn down to, then the bolt installed and torqued.



My whole point is, the installation process(if done correctly) and the bolts used(if torqued correctly) are NOT the reason the GM harmonic balancer fails. Its because the rubber connecting the two pieces dries out over time and cracks and comes apart. It could also come apart because belt tension is to high causing side loading(not generally a problem IMO).