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#1
04-22-2017, 01:24 PM
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Steering rack clunk at input shaft
This is on my 2008 E350 4Matic (123k miles now)
I have a weird suspension/steering clunk that occurs when I drive the car up a curb, and it does it worse when the car is turning at the same time. I've replaced all control arms, upper and lower ball joints and its still doing it. I got under the car today and had a helper move the steering wheel back and forth, and I found a clunk at the input shaft to the steering rack. I have no idea whether this is the same problem, but at least I can start here... Any ideas what this noise is? Is this wear in the actual rack, or what else could it be? Here is a video: https://www.youtube.com/watch?v=uN44-G4g5Tc
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k 
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#2
04-25-2017, 03:54 PM
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Are you able to read the codes off the DTC? It'll give you a great place to start troubleshooting. If the steering rack needs to be replaced, take a look at the link below for our guide on a DIY fix.
Mercedes-Benz W211 Steering Rack Replacement (2003-2009) E320, E500, E55 | Pelican Parts DIY Maintenance Article -Dmitry
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#3
04-25-2017, 05:25 PM
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seems like intermediate shaft stiction noise, on japanese and usual american cars I remove the ISS and grease it with very thin teflon grease. Usually available at toyota, mazda/ford and chevy dealers.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017)
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#4
04-25-2017, 11:25 PM
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I got back under tonight and I am suspect about the rack bushings. I think they are covered by a metal panel so I can't see them, but I confirmed its not coming from the coupler or steering shaft. Its definitely from the rack itself. So its either got to be the rack, or the rack bushings...
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#5
04-26-2017, 09:50 PM
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I removed the rack bushings tonight and the noise is still present with it no longer connected to the car, so the clunk is within the rack...I'm guessing that replacement of the rack is my only option?
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k
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#6
06-02-2020, 08:47 PM
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Has anyone solved this problem on the w211? Having these exact symptoms on my 2005 E320 CDI. I have replaced most of the front suspension, done wheel bearings, tested bushings and ball joints ...it seems like the only thing left, and source of the noise is the steering rack. Have started to feel the clunk in the steering wheel even going down mostly even roads.
On multiple sites there seem to be posts with these symptoms and noises tracked down to the rack, but I have yet to find where someone has fully solved it! Spending $600 plus for a rack seems like a gamble....
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05 E320 CDI 99 SL500 02 530i 82 240D SOLD 83 240D Euro 4spd SOLD 86 300D Euro Auto SOLD
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#7
06-07-2020, 07:27 AM
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Replaced the driver's side inner and outer tie rod as a last ditch hope. No change, though the inner joint did feel a little loose.
Getting close to taking it to an actual mechanic, though putting in a used steering rack may be about the same price as a diagnosis.
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05 E320 CDI 99 SL500 02 530i 82 240D SOLD 83 240D Euro 4spd SOLD 86 300D Euro Auto SOLD
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