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#1
03-21-2014, 01:58 PM
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W126 420SEL Lower Control Arm Rust
Afternoon all,
Just got my 420SEL back from the dealership and they found rust on the driver's side rear lower control arm. Here are some pictures.. W126 420SEL Left Rear Lower Control Arm - Imgur This rust is in an entirely different location than that of the other cars I've had to replace those arms on.. I know it should be replaced and it will however I had a tripped planned next weekend down to Cincinnati (600 miles total) and wont be able to do anything on the arm until well after that... Any thoughts on this whole thing?
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k 
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#2
03-22-2014, 01:50 AM
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That's nowhere near as bad as it was on my brother's old 300D......the shock went through it one day and it still held together until I was able to replace the arm!
His rusted all the way around and then the shock fell through. My dad's old 300sd parts car has an arm that split and bent....car was sagging but still drivable. I would rate that rust as "could patch it/paint it and drive a long while yet" or "fix when you have the time within the next year or two".
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#3
03-22-2014, 01:59 PM
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Thanks for the input. I didn't feel that it was a stop driving the car now type of thing either. I've got a 400-600 miles trip this weekend after that ill start hunting down an arm. I've done three other 126s.. Passenger sides, never a drivers though.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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#4
03-25-2014, 09:02 PM
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I've seen 3 w126s with rotted control arms so far in 3 months. Two at an indy and yours. The one at the indy near me was so bad it was horrifying. I would love to have taken pictures of it now lol. My advice is the same as pawo's. Weld it up, POR15 it and get a few more years and in the mean time pickup a spare until rust is prevalent again.
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#5
03-25-2014, 10:00 PM
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Here are some pictures from my one 300SD's arm when we replaced it back in 2011:
W126 Trailing Arm / Rear Lower Control Arm Rebuilt & Replacement Heres the pictures from the other 300SD... From January 2013 or so... also has pics of some of the rust and some sealing efforts. 1982 Mercedes 300SD Rear Control Arm Replacement - Imgur
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k
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