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Old 08-28-2003, 07:37 PM
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Unhappy Wheel Bearing(?) - Vibration after Hunter GSP9700 balancing!!!


I have a dilemma here with my C280 Sport.

Bought new sets of Michelin's MXV4, the correct size and all after being balanced at the local shop I noticed a vibration between 65-80MPH so I went back and had the balance done again.

Well to make things short and after 3 times of doing the same thing I went to a place (Miami) that do high speed balancing on the car but that didn't work neither.

After all this and having to pay for the on car high speed balancing I returned to the shop (within 30 days of tire purchase) where I bought the tires (BJ's), screamed bloody murder and had the four tires replaced by the shop. To my great dissappointment the vibration continued and I took it upon this site recommendation to a local tire shop where they have the Hunter GSP9700 (as recommended at the GSP9700 website). Again this failed!!!!!!!

I have been wondering if the front wheel bearings has something to do with it. In the mornings before getting in the freeway I hear like a clicking noise when braking or slowing down and when the car takes speed and goes through a misleveled road I feel a rubbing noise, hard to describe.

Anyone have any ideas? Any good shop in Miami that can do a super job on balancing and inspecting the front suspension?

Your help and cooperation will be greatly appreciated.

In advance thank you.

Rali Pertierra
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Old 08-28-2003, 08:38 PM
Q Q is offline
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Join Date: Aug 2000
Posts: 839
Clicking makes me think CV joint.
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Old 08-28-2003, 08:53 PM
Posts: n/a
Thank You Q!!!

Thank you Q!!!

I will check on that, it could be but would it make the car vibrate at certain speeds?

Please advice.


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Old 08-28-2003, 08:56 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,055
What do you mean "again, this failed"? Were the radial force variation readings unacceptable? Were they within the range that improvement could be made by reindexing the tire on the wheel? Was this done, or were they outside the range where reindexing will help? The 9700 measures both wheel runout and tire radial force variation and you should walk out with a data set that tells you if the wheel, tire, or both are acceptable or unacceptable.

If the vibration started with the new tires, then it's most likely that it is tire or wheel related.

Wheel bearings are easy to check for end play by "feel" and any competent tire shop should be able to check them. If they appear too be loose you should take it to a qualified MB tech for further inspection, diagnosis and, if necessary, repair.

BTW, MB wheels have a faint white "dot" on the rim flange. It can be hard to spot unless the wheel is clean and you inspect very carefully. The red dot on the tire should be indexed to the white dot on the wheel. This is called "match mounting" and indexes the highest radial force point of the tire (red dot) with the low spot on the wheel (white dot) and with a proper wheel balance will result in the least vibration.

If the tire shop does not understand match mounting, take your business elsewhere.

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Old 08-29-2003, 05:16 AM
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Join Date: Aug 2001
Posts: 530
I had the same problem with my 1995 C 280. Replaced the flex disc`s and the problem was solved.

President Minuteman Section MBCA
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Old 08-29-2003, 03:50 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Well, for what it's worth, here is my story.
Bought 4 new rims & tires.
Had them balanced on a Hunter GSP 9700, result.......vibration.
Had them re-balanced, result........vibration.
Had them dismounted & rims checked ( they are perfect ).
Had tires re-mounted & balanced for the third time on a Hunter GSP 9700, result.......vibration.
Finally took the car to an older gentleman, with a wheelbalancer older than me.
Result..............perfect .
2007 C 230 Sport.
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Old 08-29-2003, 04:34 PM
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Join Date: Mar 2003
Location: Southern California
Posts: 2,055
A Hunter 9700 performs two primary functions. First it can be used to accomplish a static/dynamic balance - same as conventional wheel balancing machines.

The second function, and one that is unique to the 9700, is its ability to measure radial force variation and wheel runout. It will also analyse the data and recommend if excess radial force variation can be corrected by reindexing the tire on the wheel.

If you just have your tires "balanced" on a 9700 the result will be the same as any other modern balance machine. Having the tires "analysed" on a 9700 is what you need to do if you have a chronic vibration problem, and the shop will undoubtedly have an additional charge for this service.

A couple of years ago the Dunlop D40M2s on my 190E 2.6 developed a vibration that I eventually attributed to out-of-round. I sought out a shop on the www.gsp.9700 web site, and it turned out that the America's Tire Store where I bought the D40s had one. Though the tires were about three years old they still had enough tread for a Dunlop warranty adjustment. I could go ahead and autorize the 9700 analysis, and if the tires were out of spec, there would be no charge. If in spec, I would be charged the quoted rate for the work. I authorized the work, and they let me hang out with the tech as he did the test. I recorded the data. The radial force variation was beyond what is considered acceptable, and the machine's analysis indicated that it could not be brought into acceptable range by reindexing because wheel runout was minimal.

I ordered a set of Sport 8000s (The D40M2s were out of production with no remaining inventory.), and got an allowance on the price based on the remaining D40 tread depth. When the tires arrived the same tech match mark mounted them and balanced them on the 9700, I slipped him a tip and he ran the 9700 analysis. They were all in the range of 8-12 pounds radial force variation, which is very good. The D40s were in the range of 30-40.

Needless to say the car is now very smooth - what you expect for a Mercedes, and I was satisfied with the deal.

There are still a few shops around that have old on-the-car balancers that spin the tires on the car. These balancers only provide static balance, but can be effective in eliminating unbalance of the hub and drum or rotor, but this is rarely an issue. Also, since the entire rotating mass is balanced, you must index the wheel on the hub for future reference. If you remove the wheel/tire from the car and do not install it with the same radial indexing relative to the hub, you will lose the balance.

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Old 08-29-2003, 09:36 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
And when the vibration is NOT the tire wheel combination look to soft control arm bushings and a resonant oscillation at speeds usually closer to 60mph.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 08-30-2003, 07:29 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Just one more little footnote to add here.
The machine is only as good as the person using it..
It also helps when the miracle machine is calibrated now & then.
Btw. duke 2.6, my roadforce variation was measured betwwen 5 & 8.
Wouldn't expect anything else from Michelin Pilot Sport tires.
2007 C 230 Sport.
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