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Old 12-05-2009, 08:24 AM
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W123 changing shocks, hit a snag.

I picked up some KYB's for the front end and a steering damper for my 84 300D. Started to remove the front passenger side shock, and after dealing with the top, I went below to find some very strange nuts fixing the shocks. They are like "outie" hex nuts, almost like stars, but with many more ridges. In fact, the closed, circular end of a wrench, size 10mm, fits every groove on the nut, but that wrench is to big to move it.

I am going to Harbor Freight today in hopes of finding a socket that will fit these nuts, but I've never seen them before and they are of course not described in Haynes. Any advice? Are these common?


84 300D, 303K
71 MGBGT, ?K
96 GMC C1500, 115K

Last edited by mattmacklind; 12-05-2009 at 09:06 AM.
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Old 12-05-2009, 08:34 AM
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Join Date: Nov 2007
Location: UK
Posts: 134
From what I remember about changing some W123 shocks a while back, I used a 10mm 12 point socket - fitted perfectly.
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Old 12-05-2009, 08:55 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 34,741
Yes and you will want a half inch breaker bar and a six inch extension. You will have to tilt the top of the shock away from the bolt you are removing each time.
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 12-05-2009, 09:05 AM
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Thanks guys! Perfect. The top isn't easy to get off either, its hard to keep hold of the shock bolt to keep it from turning as you turn the nut as you get toward the end of it.

84 300D, 303K
71 MGBGT, ?K
96 GMC C1500, 115K
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Old 12-05-2009, 11:36 AM
toomany MBZ's Avatar
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Join Date: Nov 2006
Location: central Va
Posts: 7,820
I agree with quaid, on the lower bolts, a thin walled 10mm 12 point socket, came with the front shocks I bought, Bilstein.
The top bolt can be fun too, MB mechanics use a special tool.
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W123 changing shocks, hit a snag.-shock-bolt-remover-top.jpg  
83 SD

84 CD
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Old 12-05-2009, 12:17 PM
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Join Date: Jan 2002
Posts: 18,355
I did mine with a box wrench. Can't get much movement but it you keep flipping the wrench over it can be done.

1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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