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#1
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Knocking / rattling from rear of W126
My sons 1989 300SE has a loud rattling / knocking type noise from what sound like the left rear of the vehicle. It knocks and rattles like mad driving around town. It completely disappears on the highway. I can't find anything loose in the trunk. I can not hear the sam noise if I push down on the rear of the vehicle. Any ideas?
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#2
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Sounds like the CV joints on the rear axles.
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I got too many cars!! Insurance eats me alive. Dave 78 Corvette Stingray - 3k 82 242 Turbo Volvo - Manual - 270k 86 300e 5 speed manual - 210k 87 420sel - 240k 89 560sl - 78k 91 420sel - 205k 91 560sel - 85k 94 GMC Suburban - 90k 97 Harley Davidson Heritage Softail - 25k 00 GMC Silverado 1 ton 30k |
#3
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Check the sway bar link. The ball joints go bad and make a loud knocking sound
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1986 560SL 2002 Toyota Camry 1993 Lexus |
#4
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w124 - same rearend noises
Is replacing this sway bar link a simple unbolt, install procedure? I have a parts car and easily could see if this swap does the trick. Thanks
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87 300e (white/black; amg body kit) 88 300ce (red/cream; amg body kit) 93 300ce cabrio (white/blue/blue top) 93 300ce cabrio (black/grey/black top) 98 ml 320 (totaled @ 137,000 miles) 99 clk320 (black/grey/black top) |
#5
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Yessir, it sure is. With the wheel off, shouldn't take 1/2 hour...
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1986 560SL 2002 Toyota Camry 1993 Lexus |
#6
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Yep thats what I was thinking.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#7
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Check the sway bar to body bushings as well -- a missing bushing will make horrible noises.
So will missing rubber at the top shock mount, or a loose bottom bolt on the shock. Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs! |
#8
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Wheels coming off tomorrow and I will check all the above. Thanks for the input. I'll let you know what I find.
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#9
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I have the same rattling sound in my 300SEL...it's not very loud, but I can hear it when I have the stereo off, driving around town and it gets a bit annoying. It honestly sounds like a slightly loose shockmount to me... are the upper shockmounts located inside in the car or am I way off? I can't seem to find them...but then again I haven't looked underneath the car yet...LOL
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Current cars: 2000 ML55 AMG, 174k miles 2003 C240 T-Modell, 202k miles 1995 S320, 207k Miles |
#10
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Had the same noise on my 300SD and it was the sway bar links. I would just replace them while you are there. They are not alot of $$$.
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'85 300SD (formerly california emissions) '08 Chevy Tahoe '93 Ducati 900 SS '79 Kawasaki KZ 650 '86 Kawasaki KX 250 '88 Kawasaki KDX200 '71 Hodaka Ace 100 '72 Triumph T100R |
#11
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do sway bar links first before anything more expensive. they are cheap, don't use used ones. apply penetrating oil first so you don't break the bolt off like my mechanic did!!
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R Martin Dallas, TX (Addison) 86 560SEL, 128K |
#12
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Reviving a 5yr old thread...
I have a similar rattle coming from the left rear wheel when going over bumps. Sway bar links have been replaced and the swaynbar-body bushings are good. Exhaust hangers are fine. Upper and lower shock mounts/bushings are fine. Wondering what else this could be...how could I check to see if the CV joint is bad? Could a bad bearing be making this rattle? Thanks for the help, everybody! |
#13
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First check the exhaust, Just move it around (when it is not hot!!) and see if it hits anything.
Mine made a strange noise when one of the mounting rubbers was bad. It only made the noise if I moved the exhaust a lot to the side. Rob |
#14
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Noise
That was the source of my noise last year. I took apart the connection and used a lubricant on the bushing as a temporary fix until I get around replacing the both links. The noise has not returned yet. Easy fix and not a lot of dollars as previously stated above.
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1989 300E 2005 Acura TL 2011 Hyundai Elantra Limited Swing hard! Take chances! |
#15
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If you are coming up empty-handed, there is another po$$ibility, the caliper bearing brackets.
Hope it isn't cuz it's a huge job, here is a link that shows the job, it is a PDF so you will have to click to allow the download: http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=3&ved=0CDwQFjAC&url=http%3A%2F%2Fwww.benzworld.org%2Fforums%2Fattachments%2Fw126-s-se-sec-sel-sd%2F291870d1266619920-rear-wheel-bearing-replacement-procedure-needed-35-360-rear-axle-caliper-carrier&ei=SFyhULiiMabUyQHA7YD4DQ&usg=AFQjCNG3_MQ5xVbI-Cyzas3Ysr4pZxsuGA Caliper carrier MB calls it, I think parts dept called it a bracket. Anyways it's a real pita.
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