Do I need to compress the front springs - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 02-23-2010, 07:58 PM Thread Starter
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Do I need to compress the front springs

I need to replace the upper eccentric pins and bushings (upper A arm to King Pin) in my 72 280SEL 4.5 due to excessive play. King pins seem fine. Do I need to compress the front spring prior to breaking this joint or is there a better way? The MB manual talks about a special tool that goes in place of the shock, but I can't find what this tool looks like. Any help is appreciated.
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post #2 of 12 (permalink) Old 02-24-2010, 01:43 AM
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post #3 of 12 (permalink) Old 02-24-2010, 07:46 AM
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I do these one side at a time by placing the floor jack below the spring and using the weight of the car to keep the spring compressed. then just swap it out, hopefully the eccentric bolt has not seized. Center the new one and don't forget the rubber seals.

Brian O
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post #4 of 12 (permalink) Old 02-24-2010, 10:57 AM
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I removed my front springs using a floor jack and unbolting the lower control arm and lowerering down the control arm. It was the scarriest time of my life!

Tony
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post #5 of 12 (permalink) Old 02-25-2010, 04:57 AM
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If the rubber stops under the upper Control arm are good,you need to use a regular spring compressor to clamp the Arm to the spring ( one each side ) . Use them to pull the arm down against the spring other wise you will never get the king pin and arm back together. As the others have said,use a GOOD jack under the lower control arm.
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post #6 of 12 (permalink) Old 02-25-2010, 06:17 AM Thread Starter
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Red face

Thanks for the advice. I'm in the beat, soak, twist repeat mode right now. After 24 hrs of soaking, the eccentric bolt finally turns. Hope to get it free enough to remove this weekend.
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post #7 of 12 (permalink) Old 02-25-2010, 08:39 AM
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Mercmad has a good idea for safety clamping, and good jack

I've had the bolt break
and the bushing seize into the kingpin.

Hopefully yours will release

Keep them greased,
install bolt with antiseize on the bolt and bushing bore.

Brian O
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post #8 of 12 (permalink) Old 02-25-2010, 09:08 AM
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You need some sort of clamping !!
Just using a jack, is just plain stupidity..
On some models you can fix a M20 threaded pin through the spring.. But not on all models. Get a proper spring clamp that fits, so you can be sure not to break your jaw or scull..

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1973 W115 200 -For sale as project.
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post #9 of 12 (permalink) Old 02-26-2010, 02:18 PM
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Quote:
Originally Posted by Nutz 4 Benz View Post
This pictured tool is for compressing springs and for sale on Ebay for less than $200. Don't take the chance of the spring flying out and causing damage or injury.
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post #10 of 12 (permalink) Old 02-28-2010, 01:56 PM
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Just be real careful, as if it gets away from you it can really do some damage. A compressor is the best way by far.
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