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1992 300sl, 1994 S320
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26 Posts
Discussion Starter #1
Hello All,

I am going to replace the rear shocks on my wifes 2002 C320 standard suspension with Bilstein Touring Shocks #24-114714. Does anyone know the upper and lower mount torque figures. Thank you.
George
 

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Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
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Top nut (to the frame) is 30Nm, bottom nut (on the bolt through the control arm) is 55Nm.
 

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2005 c230 Sport Sedan
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138 Posts
For the top, don't overtighten ... there is a sleeve around the shaft that fits inside the rubber bushings, and you should feel the nut suddenly get very hard to turn when you bottom out on the sleeve. At that point you shouldn't turn it much more or you will start to crush the sleeve or damage the shaft.

I installed these shocks last month and I think i overtightened the first shock trying to get the torque wrench to click. On the second one I turned only 1/4 turn or so past the bottoming out. Fortunately I don't think I caused any issues -- the shocks feel nice and taught ... knock on wood.
 

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1992 300sl, 1994 S320
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26 Posts
Discussion Starter #5
jkowtko

Thanks for the info on possibly crushing the sleeve. Just in time since I will be installing the shocks today.
 

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2005 c230 Sport Sedan
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I should also mention, it's a pain in the butt to get a torque wrench in there in the first place. Since you have to hold the post from turning, you'll need a crow's foot attachment to tighten the nut with the torque wrench (unless you a special torque wrench). At 22 ft-lbs it's not really that tight ... just reasonably snug by hand if you are using a standard box wrench.

If you don't want to use the torque wrench on the top nut, you can get a feel for the amount of force you will need with a box wrench by testing your strength on the bottom bolt. Hand-tighten the bottom bolt by hand to what you think would be about 20 ft-lbs, then check with with your torque wrench. If you go over, then loosen the bolt and try again. Then tighten some more by hand and try to get to 30, then 40. This will give you a good sense of the amount of effort you'll need with a box wrench to achieve the various torque levels, and will make you feel more comfortable about tightening the top by hand.
 
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