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  #1  
Old 09-24-1999, 07:32 AM
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Location: Cincinnati, OH, USA
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Hello Everyone,
I have a 92 500SEL and have noticed that while moving in reverse there is a loud ticking sound which frequency increases as the speed increases. If you ever attached a piece of platic to the frame of your bicycle and let it hit against the spokes of the tire, when you were little, you know exactly the sound I am getting now.

Thank You
Fred
  #2  
Old 09-24-1999, 12:53 PM
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Location: Johns Creek, GA, USA
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Have you installed new wheels lately? I had this same problem in forward and reverse when I installed aftermarket wheels with new lug bolts. One of the lug bolts was about 1mm too long and was contacting the brake assembly. I filed down the end of the offending bolt to fix the problem.

Naturally, Benzmac figured out the cause of the problem in about 3 seconds after I had been searching for a solution for hours.

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  #3  
Old 09-24-1999, 01:10 PM
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Location: Cincinnati, OH, USA
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No I have not installed any new wheels, but I am not sure what the previous owner did as far as the bolts. When I first brought the car the clicking sound was not as loud as it is now. It is to the point that even my wife has noticed it. I will check for this by having someone else drive it in reverse and see if I can narrow down the source of the sound. I really hope that is the problem and not some expensive trans. repair.

Thanks
Fred
  #4  
Old 09-24-1999, 01:14 PM
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Sorry I did forget to say that I have never heard the sound while moving forward, only in reverse. Also, it has a plastic like sound that is in cadance with the speed of the car.
  #5  
Old 09-24-1999, 01:18 PM
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Location: Austin, Texas
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Fred and I have been collaborating on this problem today since I have the EXACT same problem. Both of our cars are '92's and have the same mileage (approx 89,000). Mine is a 500E and Fred has a 500SEL. The problem is ONLY in reverse. It is HIGHLY pronounced as well and seems to be getting louder with time. I noted to Fred that when backing up, if I turn the wheels sharply, the sound might cease and start again when the wheels are straighted out. Also, if there is an elevation change like when the driveway meets the street, the sound might cease. Maybe it is something in the suspension... bearings? I have two questions:
What suspension parts (major) are the same between these two cars? AND What suspension parts are ONLY engaged in reverse?

Thanks!
  #6  
Old 09-24-1999, 10:26 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
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I have seen this caused by three things. First bolts that are too long.
Second faulty bearings inside of the c/v joints on the half shafts that drive the rear wheels. The reason for the reverse only is they develope a burr in forward and change direction in reverse.
Third parking brake shoes. Make it duplicate the problem them hit the parking brake by 2 clicks and see what happens.

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  #7  
Old 09-24-1999, 10:41 PM
metricman
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Ticking sound from transmission area in reverse only on a W140? If all else fails, take a close look at the transmission tunnel insulation, we have seen alot of them hanging down. It could be rubbing on the driveshaft, and only ticking when going in reverse.... Long shot but easy to check.

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  #8  
Old 09-26-1999, 09:01 AM
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Location: Austin, Texas
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OK! I think we may be on to something here. When I'm backing up and hear the noise, I can 'slightly' depress the parking break and the noise stops. What is going on and what sort of repair do you think is needed?

Thanks!
  #9  
Old 09-28-1999, 05:16 PM
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Location: Cincinnati, OH, USA
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I tried the parking brake while backing up but was unable to stop the sound. I will try again, maybe I did not press hard enough.

Thanks
Fred
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