Vibration through entire vehicle - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 04-06-2007, 07:23 AM Thread Starter
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Unhappy Vibration through entire vehicle

Hi,

I just purchased a 95 SL 500. It has a few issues I can live with, but the one I can't handle is a 'constant' vibration through the entire car at speeds 40mph and above. The vibration can be felt slightly through the seats and in particular if you rest your hand on the upper steering column. I thought it might be 'flat spots' on the tires. I replaced all tires with new Michilins, balanced them, etc. The vibration has lessened a bit, but it is still present. Any EXPERTS out there who might guide me in the right direction?

Thanx
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post #2 of 5 (permalink) Old 04-06-2007, 07:44 AM
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alignment, tie rods, engine mount.
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post #3 of 5 (permalink) Old 04-06-2007, 08:02 AM
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Quote:
Originally Posted by 95_SL500
Hi,

I just purchased a 95 SL 500. It has a few issues I can live with, but the one I can't handle is a 'constant' vibration through the entire car at speeds 40mph and above. The vibration can be felt slightly through the seats and in particular if you rest your hand on the upper steering column. I thought it might be 'flat spots' on the tires. I replaced all tires with new Michilins, balanced them, etc. The vibration has lessened a bit, but it is still present. Any EXPERTS out there who might guide me in the right direction?

Thanx
I would check the Flex Disc (the rubber drive discs in the driveshaft, MB does not use U joints. Usual symptom is worsening vibration upon acceleration. You can visually inspect them yourself on ramps (make sure you use jackstands in case your "Made in China" ramps collapse while you are under there). I just checked mine on my S430 while I was changing the differential fluid.

Edit: check for a bent wheel.

You might also try on the car tire balancing, by doing this you not only balance the wheel/tire but also the rotor, bearings ans any moving parts in the entire wheel assembly. I had this done on my 87 300E and it was finally perfect after multiple "free balances" from the tire dealer. Once the "on the car" or "road force" balancing was done, I never balanced or rotated again for the remaining 40K that I owned the car.
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post #4 of 5 (permalink) Old 04-06-2007, 11:06 AM
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Another thought to help isolate it:

You'll need a clear stretch of road with few other vehicles, if you can find one with a slight downhill grade so much the better.

Accelerate to 55 (decently into the range where the vibration occurs). Shift to neutral and let of the gas, see if that has any effect on it.

This test will mostly eliminate engine/transmission possibilities, which are remote anyway, but at least it's simple category to eliminate.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #5 of 5 (permalink) Old 04-06-2007, 02:49 PM
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Have someone take a peak at the fluid filled motor mounts. On a 95 they may have collapsed by now [depending on mileage and how the car was treated prior]. Pretty easy to check on a lift. If one or both are collapsed it puts everything in a bind, from tranny to the entire body. When mine collapsed the motor layed on the steering box and drove me nuts trying to find what a particular noise was.

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Being smart is knowing the difference, in a sticky situation between a well delivered anecdote and a well delivered antidote - bear.
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