Torque specs for W123

1976-1985: 230T, 230E, 230TE, 230CE, 280E, 280TE, 280CE, 240D, 300D, 300CD, 300TD,
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JoergMel
Dernburg Wagon
Posts: 6
Joined: Wed 29 May, 2019 10:37 pm
Model you own: w123
Region: Victoria
Location: Melbourne

Torque specs for W123

Post by JoergMel » Mon 10 Jun, 2019 12:28 am

Hi all,

I am working on my W123 replacing several suspension parts. From working on a Jeep, I know that torque specs, when installing things back on the car, are essential.
When I tighten up a specific screw/nut I would like to know what the required ft/lbf would to keep it in place.
Does anyone knows/has a list of these specs, when putting things back together?

Thanks
Joerg

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Bartman4800
300 SLR
Posts: 2096
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: Torque specs for W123

Post by Bartman4800 » Mon 10 Jun, 2019 11:22 am

They are all in the original Mercedes "Werkstatt Handbuch" or workshop manual, which is still available from the mercedes library.

Nothing against Jeep Chrysler Dodge (however), but you will find that the fasteners used on a Mercedes (beside being metric) are of superior quality compared to GM or Mopar stuff.
If you look at the head of the fasteners, most will display 10.9 or 12.9, which is the strength class of the fastener.

Personally, I only use torque specs when working on an engine or when tightening wheel nuts. Other than that my right hand knows to stop a 1/4 turn before the fastener snaps...
Most people's tools break earlier than suspension parts on a Merc...

Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

JoergMel
Dernburg Wagon
Posts: 6
Joined: Wed 29 May, 2019 10:37 pm
Model you own: w123
Region: Victoria
Location: Melbourne

Re: Torque specs for W123

Post by JoergMel » Mon 10 Jun, 2019 6:05 pm

Thanks a lot Bart. Just to be clear, which Mercedes Library do you mean? I searched online and the only one I found was the one from the Victorian Mercedes Benz Club. Is there another one?
Regarding the quality of the Mopar vs. Mercedes parts. You are right. The quality if the American stuff is sup-optimal. I can't recall how many screws/nuts I already stripped. Just on Friday I had to drill a hole on the coolant bleeder nut since it was seized and the torx thread was stripped in a matter of seconds. Working on my W123 is breeze compared to the Jeep. Well it could be considered a Benz, since it is a built from 2002 where Chrysler belonged to MB, but still.

User avatar
Bartman4800
300 SLR
Posts: 2096
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: Torque specs for W123

Post by Bartman4800 » Mon 10 Jun, 2019 7:17 pm

1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

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