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  #1  
Old 01-23-2020, 05:56 PM
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Question w123 300cd 1984 ( VIBRATION PERSISTS )

HI MB COLLEAGUES,

RECENTLY PURCHASED THE ABOVE AND NEED ADVICE ON A VIBRATION ISSUE WHICH WE HAVE NOT BEEN ABLE TO IDENTIFY.

AT 40/50 MPH YOU BEGIN TO FEEL A CONSTANT VIBRATION ON THE STEERING AND SOME ON FLOOR PANEL.

TIRES ERA NEW, BRAKES ARE NEW AND INJUST REPLACED THE DRIVE SHAFT WITH A USED ONE IN GOOD CONDITION PURCHASED TO ANOTHER MB COLLEAGUE. I ALSO CHANGED ENGINE MOUNTS BUT PROBLEM PERSISTS.

ANY ADVICE FROM THE EXPERTS ON HOW TO TROUBLE SHOOT ??

OR, DOES ANYONE KNOW SOMEONE WHO SPECIALIZES ON THESE W123 s ??

IF YOU CAN EMAIL I D APPRECIATE IT AS I AM STILL LEARNING TO NAVIGATE THIS SITE AND MAY MISS YOUR RESPONSES.

MY EMAIL IS : jarr56@gmail.com

THANK YOU IN ADVANCE

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  #2  
Old 01-23-2020, 06:24 PM
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have you tried re-balancing your tires?

sometimes they balance them wrong

or was the vibration there before you changed the tires?
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  #3  
Old 01-23-2020, 08:10 PM
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As suggested try a re-balance on the tires, they may have been done incorrectly or thrown a weight off. Vibration in the steering is usually tire related. Does one wheel get hotter than another, this would indicate a sticky brake which can cause vibration.

Good luck!!!
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Old 01-23-2020, 08:36 PM
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Quote:
Originally Posted by Sugar Bear View Post
As suggested try a re-balance on the tires, they may have been done incorrectly or thrown a weight off. Vibration in the steering is usually tire related. Does one wheel get hotter than another, this would indicate a sticky brake which can cause vibration.

Good luck!!!
Dragging front caliper is always the first check I do on older vehicles. As mentioned a heat comparison between both sides usually identifies it.
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  #5  
Old 01-23-2020, 10:18 PM
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It could be time for a suspension rebuild. My 350SD shook starting around 60mph and got worse the faster you went. Tires were checked, rims were checked, tires rebalanced, alignment checked, shocks were already new. Lower control arm bushings were the ultimate culprit, they'd collapsed completely. After rebuilding and replacing, the car drives like it's on rails. Totally smooth.
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  #6  
Old 01-25-2020, 09:23 PM
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I 3rd the wheel/tire balance. In my experience imbalance there starts at around the speeds you mention. Also, no bent wheels?

I would watch them while they balance the wheels on a quality machine (Hunter Road Force would be nice, but I get good luck with any Hunter balancer), and if it balances there and no bent wheels, I would check the suspension as Diseasel suggests. Have had suspension issues cause shakes for me too.

Last edited by g300d; 01-25-2020 at 10:44 PM.
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  #7  
Old 01-25-2020, 09:56 PM
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Quote:
Originally Posted by Diseasel300 View Post
It could be time for a suspension rebuild. My 350SD shook starting around 60mph and got worse the faster you went. Tires were checked, rims were checked, tires rebalanced, alignment checked, shocks were already new. Lower control arm bushings were the ultimate culprit, they'd collapsed completely. After rebuilding and replacing, the car drives like it's on rails. Totally smooth.
+1. Made a major difference on ours, but I did upper inners and subframe and sway bar too. With each new rubber bit, it seemed another vibration at some random speed was eliminated. Sway bars made a surprising difference; the old ones weren't even cracked, just not quite as tight as they could have been. All new rubber bits now and everything aligned. Had valves adjusted this week. It's like riding on air.

Henry
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  #8  
Old 02-05-2020, 05:57 AM
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THANK YOU VERY MUCH FOR YOUR RESPONSE AND SUGGESTIONS; WILL TRY THEM - ALL MAKE SENSE.

BEST

JORGE
JARR56
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  #9  
Old 02-05-2020, 05:58 AM
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THANK YOU VERY MUCH FOR YOUR RESPONSE AND SUGGESTIONS; WILL TRY THEM - ALL MAKE SENSE.

BEST

JORGE
JARR56
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  #10  
Old 02-05-2020, 06:00 AM
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THANK YOU VERY MUCH FOR YOUR RESPONSE AND SUGGESTIONS; WILL TRY THEM - ALL MAKE SENSE.

BEST

JORGE
JARR56
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  #11  
Old 02-05-2020, 04:40 PM
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And 3 times is the charm!
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  #12  
Old 02-05-2020, 05:20 PM
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Can you balance the driveshaft? I had that done once about 25 years ago.
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  #13  
Old 02-05-2020, 06:40 PM
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I'd be looking at tires, front end wear, and rotors being warped combined with a sticking caliper. At 254k miles I had the '83 front end redone after hitting the brakes and having the front end start shaking. The Benz shop took it for a test drive and called me to ask what the issue was. I told him to take it out on the NY State Thruway, get it up to about 75 and lay on the brakes, and call me back.
"Oh ya, she shakes like hell!!" was his conversation starter.

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