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  #1  
Old 04-27-2004, 10:24 PM
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DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.

USE AT YOUR OWN RISK.
Personal opinion; even I do not like doing guide rods, with a full auto shop and hoist.

Guide Rod replacement for Mercedes Benz 300SD.

Step #A. Raise and support front end.
Step #B. Remove front wheels.
Step #C. Loosen the clamp on #14 in picture.
Step #D. Remove the bracket that joins the Left and Right Bearing Bracket.
Step #E. Remove the bolts that hold the Bearing Bracket mounts to the body.
Step #F. Unscrew the guide rod sleeve from the guide rod.
Step #G. Unscrew the four bolts from the Bearing Bracket backing plate.
Step #H. Press the guide rod from the Bearing Bracket.
Step #I. Clean the guide rod pocket of the Bearing Bracket, the old steel sleeve must be removed to clean aluminum surface.
Step #J. Grease the guide rod pocket of the Bearing Bracket, axle grease is ok.
Step #K. Grease the guide rod sleeve, axle grease is ok.
Step #L. Press the guide rod by the sleeve; into the Bearing Bracket, stop when it is flush or roughly one mm above the surrounding surface.
Step #M. Install the rubber impact buffer pad and cover with four bolts.
Step #N. Tighten the four bolts in the Bearing Bracket backing plate.
Step #O. Screw the guide rod into the guide rod sleeve.
Step #P. Install and tighten the bolts that hold the Bearing Bracket mount to the body.
Step #Q. “Lose” install all the bolts that hold the bracket joining the Left and Right Bearing Bracket.
Step #R. Tighten all the bolts for the bracket joining the Left and Right Bearing Bracket.
Step #S. Tighten the clamp on #14 in picture.
Step #T. Install front wheels.
Step #U. Remove front end supports and lower car.
Step #V. Torque front wheel bolts.

If the Suspension Bearing Bracket is too corroded inside, don't repair/replace the guide rod, get NEW Suspension Bearing Bracket !!!
Vehicle: 1985 Mercedes Benz 300SD

MB# 126 330 12 43
Suspension Brng Brkt - Front - Left
http://catalog.peachparts.com/item.wws?sku=W0133-1597408


MB# 126 330 13 43
Suspension Brng Brkt - Front - Right
http://catalog.peachparts.com/item.wws?sku=W0133-1597432

Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-1985_300sd-suspension.gif   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-suspension-brng-brkt.jpg  
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Last edited by whunter; 09-29-2010 at 04:09 PM.
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  #2  
Old 04-27-2004, 10:41 PM
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Looks like this would work for a W123 as well.
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  #3  
Old 04-27-2004, 10:52 PM
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old parts 1

old parts 1
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_1.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_b2.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_b3.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_b4.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_b5.jpg  


Last edited by whunter; 12-29-2004 at 10:15 PM.
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  #4  
Old 04-27-2004, 10:56 PM
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old parts 2

old parts 2
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_6.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-300sd_guide_rods_7.jpg  

Last edited by whunter; 11-01-2006 at 12:45 AM.
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  #5  
Old 04-27-2004, 11:02 PM
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Whunter, you must have used a mighty big hammer to do all that!
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  #6  
Old 04-28-2004, 01:10 AM
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Those actually look pretty good...

Mine had no rubber left hardly holding the threaded sleeve.

A couple of things I might add is that the drivers side can move far enough toward the engine to remove it and the passenger side can go into the fender well far enough to get it off.

Count the threads for reassembly so that you get the new one roughly where the old one was.

I also used a floor jack to lift the steering knuckle while I was pulling mine and if you adjust the jack heighth slightly up and down it will change the position of the mounts enough to get the bolts for the mounts to line back up for reassembly. I also found it easier to screw the new guide rods all the way in to reassemble as it gives that little bit of extra room you need to get them back into place.
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Old 04-28-2004, 12:50 PM
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nice pics - mine looked very similar, even down to the one captive nut that broke apart in the process. I actually made a tool out of 1/4" cold roll plate with a squarish hole in it so that I could get it apart
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  #8  
Old 04-28-2004, 01:19 PM
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Note to 123's, the part labeled guide rod mount is not on a 123 chassis. This is a 126 diagram as described.
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  #9  
Old 04-28-2004, 07:26 PM
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Ah Yes........

Those pix remind me of why I escaped from Livonia!!

My poor Brother is still a Tranny repairman in Redford.....things are pretty slow right now....which is surprising with all the rot the cars suffer there.
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  #10  
Old 11-12-2004, 12:02 AM
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Unhappy Zero finance

is not helping the shops.

Back on topic.
Correct part names will make locating the correct part easy.

Bearing Bracket Bushing = picture #1.
Guide Rod Mount Kit = picture #2.
Guide Rod Repair Kit = picture #3.
Suspension Brng Brkt = picture #4.
Guide Rod = picture #5.
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-bearing-bracket-bushing2.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-guide-rod-mount-kit2.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-guide-rod-repair-kit2.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-suspension_brng_brkt2.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-guide-rod2.jpg  


Last edited by whunter; 06-14-2005 at 09:18 AM.
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  #11  
Old 11-14-2006, 03:06 AM
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Edit WIKI data

Suspension Bearing Bracket guide rod mount replacement
on the 1985 300SD
by whunter
4/27/04


--------------------------------------------------------------------------------
USE AT YOUR OWN RISK.
Personal opinion; even I do not like doing guide rods, with a full auto shop and hoist.


*Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.*

--------------------------------------------------------------------------------
1) Raise and support front end.
2) Remove front wheels.
3) Loosen the clamp on #14 in picture.

picture

4) Remove the bracket that joins the Left and Right Bearing Brackets.

picture

5) Remove the two bolts per side that hold the Bearing Bracket mounts to the body.
Note: this is where maximum difficulty is normal, due to the nut retaining tabs coming apart, please scroll down to Image-1 and Image-2.
Extreme precautions must be exercised if an oxygen acetylene torch is used.

picture

6) Unscrew the guide rod mount from the guide rod.

guide rod picture 6 and 15

7) Unscrew the four bolts from the Bearing Bracket backing plate.

picture 7 and 14

8) Press the guide rod mount from the Bearing Bracket.
9) Clean the guide rod mount pocket of the Bearing Bracket, the old steel sleeve must be removed to a clean aluminum surface.
10) Grease the Bearing Bracket pocket, axle grease is ok.
11) Grease the guide rod mount tension sleeve, axle grease is ok.

picture 11 and 12

12) Press the guide rod mount by the sleeve; into the Bearing Bracket, stop when it is flush or roughly one mm above the surrounding surface.

picture 11 and 12

13) Install the rubber impact buffer pad between the rear of the guide rod mount and the Bearing Bracket cover, finger tighten the four cover bolts.

picture

14) Tighten the four bolts in the Bearing Bracket backing plate.

picture 7 and 14

15) Screw the guide rod mount into the guide rod.

guide rod picture 6 and 15

16) Install and tighten the bolts that hold the Bearing Bracket to the body.
17) "Loose" install all the bolts that hold the bracket joining the guide rod mounts.
18) Tighten all the bolts for the bracket joining the Left and Right Bearing Bracket.
19) Tighten the clamp on #14 in picture.

picture

20) Install front wheels.
21) Remove front end supports and lower car.
22) Torque front wheel bolts.

If the Suspension Bearing Bracket is too corroded inside, don't repair or replace the guide rod mount, get a NEW Suspension Bearing Bracket !!!

Note: this part number is the same for all W126 chassis.

Here are pictures of the old parts:

--------------------------------------------------------------------------------
Image-1


Image-2


Image-3


Image-4


Image-5


Image-6


Image-7
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-bracket-joins-guide-rod-mounts.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-5-remove-bolts-hold-guide-rod-mounts-body..jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-7-unscrew-four-bolts-mount-pod-backing-plate..jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-guide-rod-picture-6-15.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-11-grease-guide-rod-tension-sleeve-axle-grease-ok.jpg  


Last edited by whunter; 09-29-2010 at 04:11 PM. Reason: total name change
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  #12  
Old 11-14-2006, 04:45 AM
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more pictures

more pictures


Edit:
The picture for #13 did not load correctly, deleted it and reloaded.
It is correct now.
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-tab_nuts.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-13-install-rubber-impact-buffer-pad.jpg  

Last edited by whunter; 11-16-2006 at 01:52 PM.
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  #13  
Old 11-16-2006, 06:29 PM
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I agree: RE: PM.

Some of the picture captions where confusing.

Here are edited pictures.

Picture step #3 and #19 is 1985_300sd_suspensionXYZ.GIF

Picture step #4 and #18 is bracket that joins the left and right bearing bracketsABC.JPG

Picture step #5 and #16 is 5 Remove the bolts to the body.JPG

Picture step #6 and #15 is guide rod.jpg

Picture step #7 and #14 is Bearing Bracket cover.jpg

go to the next post for remaining pictures.
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-1985_300sd_suspensionxyz.gif   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-bracket-joins-left-right-bearing-bracketsabc.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-5-remove-bolts-body.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-guide-rod_abc.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-bearing-bracket-cover.jpg  

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  #14  
Old 11-16-2006, 06:31 PM
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more picture edits

Picture step #11 and #12 is 11 Grease the guide rod tension sleeve.JPG


One addition for the BAD old parts pictures.

Bad guide rod mount.jpg
Attached Thumbnails
DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-11-grease-guide-rod-tension-sleeve.jpg   DIY Bearing Bracket guide rod mount replacement for Mercedes Benz 300SD.-bad-guide-rod-mount.jpg  

Last edited by whunter; 11-16-2006 at 06:55 PM.
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  #15  
Old 04-28-2009, 06:10 PM
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Hi members. This is my first post. I am in the process of rebuilding the front end of my 87 300SDL. I am having a difficult time installing the new large rubber bushings into the bearing bracket. Tried install using a 1/2" hexhead bolt to pull (similar in design to the mercedes tool) and tried using a hyd. press. Only went so far, approx 1/2" away from being seated. Please advise. Thanks in advance,

Wayne

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