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2004 S55 , 2005 S55 , 2004 S430
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75 Posts
Discussion Starter #1
So I recently disassembled a defective arnott rear abc strut and it appears to have a new upper mount with a mercedes part number on it. So if it has it's own part number where are they coming from, if we can't get them separately to replace without having to replace whole strut with questionable partially rebuild arnotts. I doubt them have a partnership with mercedes if they did they would have better quality. I would just like to replace mounts only
20191006_133812.jpg
20191006_133812.jpg
 

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2004 S55 , 2005 S55 , 2004 S430
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75 Posts
Discussion Starter #2
20191006_133850.jpg

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This part has it's own number so the number on the mount can't be the number for the whole strut which is what comes up from google search. Even a chinese copy would be worth trying
 

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2004 S55 , 2005 S55 , 2004 S430
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Discussion Starter #4
Well I looked closer trying to understand the design of these mounts and looks like there is an empty space inside the mount that collapses with time and causes the problem. I just did the spacer trick with some extra polyurethane bushings I had. Just cut them down to the right thickness about 10mm which is exactly the gap in this slightly used/new rear mount. Seems like an oversight by the engineers or they should of made it serviceable. I guess I just expect more from mercedes , no one is perfect. Yea I had to build my own socket, not my best creation but used stuff i had in toolbox and 0 dollars spent and an hour of my time.
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Notice the top nut has it's own part number as well but it's a mystery too.
 

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2004 S55 , 2005 S55 , 2004 S430
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75 Posts
Discussion Starter #5
The fronts can be done with car resting on ground and the rears require struts to be removed so I will tackle that later this week. Also where the thumping is located in rear especially over speed bumps, I already did subframe bushings to correct that problem but no joy hopefully this will solve the problem for good
 

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2006 S600
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227 Posts
It's worth drilling the holes out on the strut top washers.

It's difficult to stop the tool slipping out otherwise.

It's a 35 x 5mm pin tool if I recall correctly, and you can't use an adjustable tool, they just don't work. I made my own like yours.

Nick
 

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Discussion Starter #7
I should add that doing this to all 4 struts made a significant improvement in how the car feels connected to the road. Now that the shock absorbers can effectively control rebound and I had alignment checked by a good technician and nothing was off.
 
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