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Car Forum / Mercedes-Benz Cars / February 2007

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1978 300D control arm bushing replacement

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brokespokes - 08 Feb 2007 20:45 GMT
Hello,
I need a bit of advice on the control arm bushings.  My control arm
bushings are totally shot, I am able to move the upper control arm up
and down a few inches with a bar.  The lower bushing also look in bad
shape.  They sag down quite a bit.  The handling is terrible ( I am
talking a crazy wobble when getting up to speed) and there is severe
wear on the inside of both the fron tires.  I paid 200 bucks from this
old lady and drove it home.  Really I just want to replace the worn
parts.

1)  I plan on cutting the old control arms completely out (torch
possibly). Anyone done this?

2)  I have 1" threaded rod to make my own spring compressor and plan
on chaining the spring into place.  Anyone have any experience doing
this?  What do you think?  Is there any tricks to know?

3)  Would it be better to replace just the bushings rather then the
whole arm?  I would go this route but it seems easier for me to cut
out the old control arms right out as the bolt is seized above.

4)  Any advice in replacing the lower control arm bushings? They seem
pretty straight forward. (except for maybe pushing the new bushings
into place.)

Thanks
Richard Sexton - 09 Feb 2007 02:20 GMT
>2)  I have 1" threaded rod to make my own spring compressor and plan
>on chaining the spring into place.  Anyone have any experience doing
>this?  What do you think?  Is there any tricks to know?

That's a good way to die. Mercedes springs aree more like truck
springs that car springs. You need a special compressor. Rest one.

Having said that I've seen people take suspensions apart with
just a jack perfectly safely but I don't know wnough about it
so advice you how.

Signature

  Need Mercedes parts?   http://parts.mbz.org
Richard Sexton       | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net

Tom Plunket - 09 Feb 2007 03:34 GMT
> I need a bit of advice on the control arm bushings.  My control arm
> bushings are totally shot, I am able to move the upper control arm up
> and down a few inches with a bar.

My wife's '85 300D had the same symptoms when we got it.  A couple
hundred bucks at the local mechanic solved the problem for us; I wasn't
too interested in doing the work myself but it looks pretty straight
forward without cutting anything with a torch.

Just buy the new parts and bolt them in.  Why cut things to bits?

-tom!

--
Tiger - 09 Feb 2007 15:14 GMT
Use internal spring compressor to remove the spring first, then you can do
whatever you want. Once you take the spring out, make sure you decompress it
or you got a missile sitting there waiting to explode on you.

Why cut if everything will come out by loosening the bolt?
brokespokes - 09 Feb 2007 15:26 GMT
> Use internal spring compressor to remove the spring first, then you can do
> whatever you want. Once you take the spring out, make sure you decompress it
> or you got a missile sitting there waiting to explode on you.
>
> Why cut if everything will come out by loosening the bolt?

The bolts are seized (upper). Anyone had this problem before? I know
it's fairly common.
Tiger - 09 Feb 2007 23:27 GMT
Brake lines are really close to the upper bolts so if you ignited the brake
fluid, you can't stop it...

You can use the torch to heat up the bolts so you can loosen it in all other
safe places.
heav - 10 Feb 2007 02:26 GMT
The guy who says messing with the spring is a good way to die is
correct.  You will not have time to react before the spring takes your
head off if you start messing around with a cutting torch under there.

The front springs of a Mercedes 300 are in a place that requires a
special spring compressor to remove them safely.  It is possible to
replace the bushings without removing the springs, however.  You can
just use the weight of the car to compress them.  But if you want to
renew the springs take the car to a Mercedes dealer and have them put
the springs in for you.  I had new front springs installed on my '82
300 TDT last year.  It drives like new now and the tire wear is even
all the way across like when the car was new.  Tires are lasting for
years again.  I can tell because a set of tires I put on last spring
still look like new.  No worn inside or outside edges like before I
replaced the springs.  You can buy the special compressor for about
$600.  Labor to have the Mercedes dealer in Las Vegas do mine was
about $400.  I bought the springs on line and brought them in.  My old
springs had about 385,000 miles on them.  I replaced the rear springs
at about 250,000 miles and I probably should replace them again soon.
The rear springs may be less critical because of the load leveler, but
if the springs get tired you will end up needing to replace the very
expensive components of the load leveler system.

Paul Fretheim

> Hello,
> I need a bit of advice on the control arm bushings.  My control arm
[quoted text clipped - 22 lines]
>
> Thanks
 
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