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#1
05-04-2009, 01:23 PM
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Ques on Fr. Cntrl Arm /bushing removal; 98 SL500
How is the removal of the control arm bushings accomplished. I see that the new Lemforder bushings have a steel collar in the press-fit area that has a bent over lip that appears to sit over the outside of the bore in the control arm.
Is this 'lip' robust enough to allow hammer/punch drifting them out by walking the blows around the perimeter? Hopefully these things aren't too tight in the control arm. Any experience, advice, etc. is appreciated. 
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#2
05-04-2009, 06:45 PM
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A hammer and a drift may be possible, but I wouldn't attempt it wthout an air hammer. By hand it would take all day, with air a few minutes.
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#3
05-22-2009, 04:05 PM
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Thank you again Duxthe1
I did the front control arm bushing replacement on the R129. Your reccomendation on NOT attempting it without an air hammer was crucial advice. Even though there is not much metal-metal engagement on that ring collar, those things were tough to get out with the air hammer. Part of this was my learning just the right technique for delivering nice blasts of raps. With 8 bushings and all, it takes some time.
Dealing with those springs is really something. The wire diameter is essentailly 5/8 inch or whatever that comes out to in mm. They were like something you might see on a small bus. Those are real tough to work with when you don't have the right MBZ spring compressor. My quick-fabbed leaf-style spring compressor made from 1/2" allthread and 1/4" aluminum plate was not quite ready for prime-time. In the end, what worked was a partial preloading of the spring and carefully lowering the control arm from the inside. I then quickly took the cocked spring over to a shop hydraulic press to get it tamed into shape and re-align my spring compressor leaves and take it back out just when I was ready to install the control arm. About halfway between the free length of a little over 16 inches and the installed length of ~12 inches is needed to get it onto the lowered control arm; about 14 inches. When raising the control arm back up with the floor jack, it is necessary to increase the preload of the spring compressor to muscle that control arm into position. All in all, the job took me 5 hours, but I had to machine a couple of rings to press the bushings in also. Tough job.
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