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Old 02-21-2010, 02:41 AM
pwogaman's Avatar
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Join Date: May 2003
Location: Northern, Virginia
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Another pictorial - Changing W124 4Matic front lower ball joint. (4Matic only)

My front left ball joint began squeaking badly. Here is what is I did to replace it.

Safety first, block the rear wheel.



Jack up front end and support under both lower control arms so there is car weight pressure on the coil springs. Lift both sides so you can turn the wheels while working on the project.




Do not put support under the ball joint like in this picture.



Remove ball joint nut and bolt on steering knuckle (I found it helpful to remove the turn stop with a 17mm wrench, so I could get to the ball joint nut on the steering knuckle with a straight extension).



Note turn stop is removed in background of this picture.



Remove three 19mm bolts and one 19mm nut which retain the ball joint housing to the lower control arm.



Install in reverse using blue thread lock. I put in a "gently used" one from a parts car pictured on the right here. This is an option only when you the ball joint does not have to be pressed out for removal. I cleaned it up and repacked the grease. It might not last as long as new, but the price was right.



I found it easier to install the replacement on the lower control arm first and then to install it to the knuckle. I needed to jack the lower control arm from under the ball joint to get it to seat in the knuckle (sorry no picture).

CAUTION - MAKE SURE YOU DO NOT PULL THE FRONT AXLE OUT OF THE INNER TRIPOD JOINT. A ROLLER COULD FALL OFF ALLOWING THE NEEDLE BEARINGS TO FALL OUT WITHIN THE BOOT. YOU WILL HAVE TO REMOVE THE AXLE TO FIX THIS PROBLEM.

Here is a picture of a new one for reference.



The part numbers are 124 333 07 27 and 124 333 08 27. I forget which is right and which is left.
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Peach Parts W124.128 User Group.

80 280SL
85 300SD
87 300TD
90 300TE 4Matic
90 300D 2.5 Turbo
92 300D 2.5 Turbo
92 300TE 4Matic
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  #2  
Old 01-19-2011, 03:08 PM
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Location: Vancouver, BC
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Was the squeak you experienced that prompted this replacement very pronounced when turning in either direction and much fainter when hitting a bump in the road?
I have a 91 300te 4matic and I suspect the ball joint even though there is no visible damage to the boot, the sound though it echoes down there seems to be coming from the ball joint at the wheel...
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Old 01-27-2011, 11:38 AM
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Location: waterloo ontario
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i just replaced both front on my car upon advice from my alignment shop.the typical ball joint check did not indicate there was any play.but once we got them off it was apparent.the new units were not cheap $125 ea thru a US supplier.makes quite a difference though in ride quality.at the same time i replaced a tie rod
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Old 01-27-2011, 12:33 PM
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I replaced mine (just the right side) last weekend as well, the joint was expensive. I was stunned at the condition of the old one, the joint was completely dry and most likely corroded in the undamaged boot.
Surprisingly easy repair on a 4matic.
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Old 01-27-2011, 01:46 PM
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Location: waterloo ontario
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if you compare the 4 matic ball joint with a regular 124 ball joint you will notice it is somewhat beefier.i assume to avoid the possibility of it letting go and causing extensive (expensive) front end damage.
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