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Car Forum / Mercedes-Benz Cars / December 2006300SDL "Ringing"
Recently I've noticed a ringing noise coming from somewhere in the rear of my '87 300SDL at freeway speeds. It's espec- ially evident when I turn an ear toward the back seat area. I thought it might be a dragging brake, but applying the brakes doesn't change anything. And it seems to me that if the dif- ferential were about to give up the ghost, I'd hear a lower pitched rumbling sort of noise rather than a high-pitched keening sound. Any idea what the cause of this noise might be? Geoff -- "Kwanzaa bells, dashikis sell, Whitey has to pay Burning, shooting, oh what fun on this made-up holiday!" > Recently I've noticed a ringing noise coming from somewhere > in the rear of my '87 300SDL at freeway speeds. It's espec- [quoted text clipped - 7 lines] > > Any idea what the cause of this noise might be? I would check the "doughnuts" that hang the exhaust system. The other thing I would check is the bushings (I think they are nylon) on the rear torsion spring/swar bar behind the rear wheels. Do you get a _clunk_ when your rear wheels go over a speed bump? > Geoff > > -- > "Kwanzaa bells, dashikis sell, Whitey has to pay > Burning, shooting, oh what fun on this made-up holiday!" >Recently I've noticed a ringing noise coming from somewhere >in the rear of my '87 300SDL at freeway speeds. It's espec- [quoted text clipped - 7 lines] > >Any idea what the cause of this noise might be? You'll feel the diff and smell diff fluid long before it fails. Sounds more like a wind noise than anything mechanical to me.  SignatureNeed Mercedes parts? http://parts.mbz.org Richard Sexton | Mercedes stuff: http://mbz.org 1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net 633CSi 250SE/C 300SD | http://aquaria.net http://killi.net not sure what you might mean by 'ringing', but in the even that you might mean 'whining' rather than ringing like with a bell, it could be your drive shaft support bearing..... does it get worse when cold? cheers, guenter >>Recently I've noticed a ringing noise coming from somewhere >>in the rear of my '87 300SDL at freeway speeds. It's espec- [quoted text clipped - 12 lines] > >Sounds more like a wind noise than anything mechanical to me. > not sure what you might mean by 'ringing', but in the even > that you might mean 'whining' rather than ringing like with > a bell, it could be your drive shaft support bearing..... Whining would be an adequate description. The sound does have a metallic quality to it, though. > does it get worse when cold? Yes, it does! And until you asked, I hadn't noticed that the noise is present when I drive to work very early in the morning when the temps are in the 30s or 40s, but absent when I drive home in the afternoon in 60-70F temperatures. Assuming the noise is from the drive shaft support bearing, is this something that I should have looked at soon because it could fail catastrophically and without warning, or can I wait until the noise becomes annoying? Is it an expensive fix? Thanks to all who answered. Geoff -- "GHACK!" -- Saddam Hussein >> not sure what you might mean by 'ringing', but in the event >> that you might mean 'whining' rather than ringing, like with [quoted text clipped - 14 lines] >fail catastrophically and without warning, or can I wait until >the noise becomes annoying? Is it an expensive fix? mine's been doing that for the last few winters.... just appears to be annoying cheers |
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