Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-03-2004, 08:38 AM
Registered User
 
Join Date: Feb 2004
Location: New England
Posts: 12
W126 Hydropnuematic suspension?

Hello,
My recently purchased '87 560SEC needed new gas reservoirs which I replaced. The symptoms were: lack of self leveling and a hard ride.
The self leveling problem has been solved and most of the hard ride.
My question is, there is still a harsh jolt when riding over a hole or bump. Holes and bumps that my non- hydro suspension car (380SEC) have no problem with.
I suspect more suspension or chassis component trouble. Since the ride is otherwise smooth as silk so I do not suspect the shocks. I am thinking that the rear subframe mount bushings may be worn and adding to this problem.
Any thoughts as to what I might look at?

Thanks,
Rick

__________________
Rick Hesek
Northboro, MA
Reply With Quote
  #2  
Old 03-03-2004, 08:42 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I would look at the upper shock/strut mounting rubbers. Actully there is no way to look; one must replace and look at what comes out to confirm.

They are bound to be cheap 115 326 16 68 and 114 326 00 68. Ten bucks worth of rubber and a bunch of work.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Last edited by stevebfl; 03-03-2004 at 08:48 AM.
Reply With Quote
  #3  
Old 03-03-2004, 10:47 AM
Registered User
 
Join Date: Feb 2004
Location: New England
Posts: 12
Thanks Steve,
I may be wrong but I believe I can replace the rubber parts without completely removing the strut. (?)
I don't have a lift and all the work related to the hydraulic connections would turn it into a big job if I am wrong.

Rick
__________________
Rick Hesek
Northboro, MA
Reply With Quote
  #4  
Old 03-04-2004, 06:34 AM
Registered User
 
Join Date: Aug 2001
Posts: 530
You need to replace the upper shock bushings. This done by removing the rear seat, opening the plastic cover, crack the hose so you can compress the shock.

This will make a world of difference. When the accumilators{ air cells} go bad the bushings get hammered, causing thumps and a hard ride. Less than hour to do both sides.

John
__________________
President Minuteman Section MBCA
www.mbca.org/minuteman
Reply With Quote
  #5  
Old 03-04-2004, 07:37 AM
Registered User
 
Join Date: Feb 2004
Location: New England
Posts: 12
Thanks John,
I think I will do this job since it isn't that involved.
I did look at the rubber bushings yesterday and they look tight and in pretty good condition. The lower bushing is not that easy to see, however.
One thing that puzzles me. I replaced both reservoirs and my shop manual has nothing regarding bleeding the air out of the system.
I have designed hydraulic systems and, in pressure circuits like hydraulic pistons, etc., anytime the fluid connections are opened the air that gets in needs to be bled out.
My car is behaving like there is air in the struts.
Is this normal for these suspension systems?

Thanks again,
Rick
__________________
Rick Hesek
Northboro, MA
Reply With Quote
  #6  
Old 03-04-2004, 12:06 PM
Registered User
 
Join Date: Aug 2001
Posts: 530
Rick,
The system is self-bleeding. The bushings may look ok,but when you get them out you`ll see that there mushroomed and that`s the problem.

My car is a show winner, located in Webster.

John
__________________
President Minuteman Section MBCA
www.mbca.org/minuteman
Reply With Quote
  #7  
Old 03-04-2004, 12:15 PM
Registered User
 
Join Date: Feb 2004
Location: New England
Posts: 12
Smile

I have already ordered the parts.
I will do this over the weekend.
I was in Webster in early Feb. for a Little League meeting.
I know of a couple other coupe owners in Mass. Do you guys ever do get togethers?

Thanks for your help,

Rick
__________________
Rick Hesek
Northboro, MA
Reply With Quote
  #8  
Old 03-08-2004, 07:42 AM
Registered User
 
Join Date: Feb 2004
Location: New England
Posts: 12
W126 Hydro Suspension- back to normal

I replaced the rubber bushings at the top of both shock/ struts over the weekend. The old ones were definitely fried. They were about 50% set of their original height.
What amazes me is the difference in ride quality that these make.

Thank you all. Now onto the ACC system.

Rick
__________________
Rick Hesek
Northboro, MA
Reply With Quote
  #9  
Old 03-08-2004, 09:14 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
If you only replaced the upper bushings you probably have left most of the problem. The car sets on the lower bushings not the upper ones. I refer to upper and lower, this is the upper and lower bushings of the UPPER shock mounting.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #10  
Old 03-08-2004, 09:41 AM
Registered User
 
Join Date: Feb 2004
Location: New England
Posts: 12
Steve,
4 bushings replaced. 2 each side.
Qty 2, part numbers 115 326 16 68 and qty 2, part numbers 114 326 00 68.

Thanks for checking,

Rick
__________________
Rick Hesek
Northboro, MA
Reply With Quote
  #11  
Old 03-08-2004, 11:02 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Good job!

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:43 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page