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06 Vibration
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Art-1
I watched Corvette Summer
| Posts: 5
| Joined: 04/12
Posted: 04/30/12
10:09 PM
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I'm the new, second owner of a 06 Z51 coupe. The car has new Firestone run flats that have been balanced to better than 0.25 oz. Fresh wheel alignment.
During my first trip, ongoing at about 2,000 miles, I noticed a "rolling" vibration that comes and goes sine wave fashion at a few seconds. The vibration was worse before wheel alignment and balance. The vibration ceases when turning left (any left turn, like freeway sweepers, in town, whatever) and becomes slightly worse turning right. Its most noticeable in the 55 to 75 mph range, not noticeable at city street or extralegal speeds. The vibration is in the steering wheel and on front floorboards.
I'm wondering what to try next after this trip. Switch front tires right to left? Has someone else seen this?
Thanks Art
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waynep71222
Duntov Incarnate
| Posts: 241
| Joined: 04/12
Posted: 04/30/12
10:48 PM
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what kind of shop did the wheel balance..
take it back and have them recheck the balance .. after they calibrate their wheel balancer..
the settings could have been off just slightly.. or some other disaster...
are the wheels bolted on tight... probably..
you could also be loosing a wheel bearing and hub assembly.. as that is more likely to straighten up during turns..
this is what the back side of a hub and bearing assembly looks like for the front...
big wide tires exert additional loads on these and a good pot hole can hammer the ball bearings and dent the races causing failure.. sometimes a car will get into deep water usually when parked so the owner may never know.. the water will leak into the wheel bearings and cause corrosion and bearing failure.. these are NOT that hard to change on the fronts.. the rears just a little harder as you have to loosen the axle nut to get them off along with the mounting bolts and ABS sensor wiring..
the change in vibration when turning really indicates wheel bearing failure..
jack up one wheel at a time.. see how much up and down movement you get at the tire.. in and out at the top and bottom..
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waynep71222
Duntov Incarnate
| Posts: 241
| Joined: 04/12
Posted: 04/30/12
10:49 PM
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with it fixed.. you should be artfully carving the street corners again soon..
do post what happened..
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pepsi1
Duntov Incarnate
| Posts: 88
| Joined: 01/12
Posted: 04/30/12
11:04 PM
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Sounds to me like a bearing hub. Vibrations usually square them selves.ie.
A vibration in a drive line at 30mph will go away and come back at 60mph above 60mph it will come back at 120mph. Vibrations are a *** to find unless like yours seems cut and dry...Good Luck
Bob
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pepsi1
Duntov Incarnate
| Posts: 88
| Joined: 01/12
Posted: 04/30/12
11:08 PM
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If they used stick on weights as they should have,sometime the weights will come off. if the tech doesn't clean the area of the the weight.
I had one come off and it went right through the plastic wheel house cover. It sounded like a shot gun went off...
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pepsi1
Duntov Incarnate
| Posts: 88
| Joined: 01/12
Posted: 04/30/12
11:10 PM
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Another thing that may cause a vibration if the wheel wasn't torqued on properly.
The tech should have had a torque bar. so he can't over tighten the wheels.
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Art-1
I watched Corvette Summer
| Posts: 5
| Joined: 04/12
Posted: 05/02/12
11:15 AM
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Folks, thanks for the comments. I lean to a bad bearing, mostly because "it goes away in left turns". I think, accentuate think, the wheels were replaced correctly. I was watching, not doing. Unfortunately they weren't hand torqued, I'll redo that after this trip is finished. The vib isn't changing as the miles increase, or at least not noticeably.
Balance seems to be spot on. There is not the slightest suggestion of wheel imbalance at any speed. This vibration is not characteristic of wheel imbalance that I ever experienced. The shop did use a bar looking for bearing movement, found none.
How expensive are the hubs? Any special tools or techniques needed to change them? (I'm an experienced back yard mechanic but never worked in the field.)
Thanks
Art
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waynep71222
Duntov Incarnate
| Posts: 241
| Joined: 04/12
Posted: 05/02/12
12:18 PM
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depends if its front or rear...
usually with the later model ABS brakes... you have to remove or unlatch the rear stuff as shown above on the front wheel hub.. to remove it...
you do have to remove the wheel.. unbolt the caliper from its bracket... move it out of the way and hang it on a thick wire to prevent the brake hose from being stretched ... pull the rotor.. then the bolts probably come through the back...
hubs vary in price... depending on the brand and where you buy them... you are probably going to want delco or timken brand
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pepsi1
Duntov Incarnate
| Posts: 88
| Joined: 01/12
Posted: 05/02/12
05:08 PM
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Art-1
Your welcome.
Yeah it sounds like a bearing hub.
Just some FYI Anytime your around those ABS sensors be careful not to bang or even hit that wheel hub, I've seen guys install wheels with an impact and a customer is back complaining brake light is on.
Bob
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87corvette
Duntov Incarnate
| Posts: 171
| Joined: 03/12
Posted: 05/03/12
12:42 AM
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Rockauto.com has them for $300
http://www.rockauto.com/catalog/moreinfo.php?pk=1259966
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87corvette
Duntov Incarnate
| Posts: 171
| Joined: 03/12
Posted: 05/03/12
12:43 AM
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accidental duplicate
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Art-1
I watched Corvette Summer
| Posts: 5
| Joined: 04/12
Posted: 05/28/12
08:05 PM
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Thanks to all who replied. The front bearings are replaced; the vibration is completely gone.
Regards
Art
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pepsi1
Duntov Incarnate
| Posts: 88
| Joined: 01/12
Posted: 05/29/12
03:12 PM
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Your welcome Art: Enjoy the summer.
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