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  #1  
Old 03-30-2004, 09:59 PM
Evan's Avatar
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Location: Fairhaven MA
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Unhappy Tire Balance, Alignment, Or NEITHER?

First i guess i should state that i have a 1991 300E just so i dont aggrevate anyone hehehe...

My car drives great, nice tight ride, smooth acceleration until i hit 60 MPH.. right at 60mph i get a very faint pulsating vibration in the car that appears to be coming from the front end. This only happens if i am applying the gas to accelerate even slightly. If i let the car level off at speeds above 60 MPH the vibration goes away. If i go up a moderate incline i can feel the vibration at 60 mph and over

I havent had the tires balanced in a while however i did just recheck and adjust the air pressure in the tires. I just had a front end alignment. One of the cheap ones actually. Does my car require a 4 wheel thrust alignment or does the regular front end alignment do the job most of the time??

Could it be anything other than the alignment or the balancing?

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  #2  
Old 03-30-2004, 10:05 PM
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If it is coming and going at the same speed with changes in throttle, then it is not a problem with the tires or balancing. A rotational problem would be appraent with speed regardless of engine load.
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  #3  
Old 03-30-2004, 10:18 PM
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my car has a 70mph vibration, it used to be a 60mph vibration until i found out i had a bent wheel it moved it to the back.

my car also wanders to the right, even after a 4-wheel alignment.

I have learned from this forum that these cars need a four-wheel alignment, with a spreader bar used for the front wheels.

I'm thinking of going to a dealership to have another 4-wheel alignment carried out, if my tech can't find anything obvious wrong with the front end.
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1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
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  #4  
Old 03-30-2004, 10:21 PM
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Check flex couplings

You should check the driveshaft flex coupling front and rear.

If these are both OK, then look carefully at transmission center mount. Sometimes oil or transmission lube leaking and dripping onto the trans. mount can cause the rubber to swell and break loose. This in turn could put extra stain on the (2) engine mounts.
Be sure to check your engine mounts too, if it turns out your center transmission mount is broken (or real soft from oil contamination)

My guess is still the driveshaft flex couplings.

Luck to you,

DanielW
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  #5  
Old 03-31-2004, 09:05 AM
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I use to have this same problem with the car,,, when they installed new tires on the car and did a 4 wheel thrust alignment back in july it fixed it. When my control arm broke and i replaced that, the vibration came back..
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  #6  
Old 03-31-2004, 09:17 AM
LarryBible
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The way you describe this, it sounds like what the MB service documentation calls "Thrumming." This is driveshaft related.

Before attacking the driveshaft, I would do two simple things; Swap tires front to rear and see if it goes away. If that doesn't work, remove the three 8MM hex size screws that hold the heat shield in place above the catalytic converter. Then "roll" the heat shield sideways until upside down so you can remove it.

Loosen the drivers side bolt on the carrier bearing mount about three or four turns and remove the passenger side bolt. Put two washers between the passenger side carrier bearing mount and the body and thread the bolt back through and then tighten both bolts.

Replace the heat shield and test drive. The U-joint flexes so little that it gets wear in one very specific spot. The washers move the rotating position of the u-joint just enough to get it away from this worn position.

BTW, you should visually inspect everything, mainly the flex discs while you're under there. The front one is typically the only one that will fail due to the heat that it deals with. The rear one deals with no heat.

Good luck,
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  #7  
Old 04-04-2004, 01:29 PM
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Update.. The problem was the tire pressures read as follows...

Front Drivers Side :25psi
Front Passenger Side:32psi
Rear Drivers Side: 30psi
Rear Passenger Side: 27 psi

Check when cold


corrected all the tire pressures and the annoying vibration was gone,, who would have known !!
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  #8  
Old 04-04-2004, 03:33 PM
Ali Al-Chalabi's Avatar
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Uh, yes. It goes without saying that before trying to find out what is causing a vibration that the tire pressures would have been properly checked. Large differences and underinflation like that can cause vibrations.

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