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  #1  
Old 01-19-2005, 12:16 PM
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Red face Changed the accumulators but no difference in ride quality.

I did a search on "accumulators" and found many threads and spent hours reading last couple days but none really addressed the issues I have.

I installed 2 new accumulators but noticed there is no difference in ride quality at all. I know the old accumulators are shot because when I removed them, ALOT of foamy fluid (an indication of bad accumulators) came out.
I tested the hydraulic pump and valve and all are working perfectly. There is no leak at the shocks are anywhere. I also did the fluid flush and even tried to get the old fluid in the shocks out by filling and emtying it a few times by raising and lowering the valve level (the rear also rised and lowered).

The car performs exactly like I was still riding on the old accumulators. The dampening is there. The ride is not bouncy but harsh on rough roads especially over pot holes and expansion joints. It goes "kaboom" and jolt a little over pot holes and expansion joints. I do not think it bottoming out because the rear is at the right height and still has lot of travel.

I don't really know what is going on Did I miss something during the installation? What else is wrong?

Any advise, helps, comments are very much appreciated.

THANKS!!!
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1991 420SEL Project Car (Completed and rides beautifully) http://www.peachparts.com/shopforum/tech-help/112321-free-1991-420sel.html
2000 BMW 740IL
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2005 S2000 - Track Car
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89 560SL
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  #2  
Old 01-19-2005, 12:32 PM
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Now you need to replace the strut bushings. The thump in the rear you're hearing going over bumps is due to the collapsed strut bushings.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1FI0QTEA41FI0QTP0S&year=1986&make=MB&model=560-SEL-001&category=L&part=Shock+Bushing , should link you to a picture.
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  #3  
Old 01-19-2005, 01:55 PM
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Thanks Mike, I've always think highly of your comments/replies not only to me but also to others. I will replace the strut bushings as you recommended.

Originally I wanted to replace the accumulators was because of that thump in rear thinking the accumulators were shot. If it turned out that was because of the collasped strut bushings, then was my money and labor wasted on the accumulators? Could it be that the old accumulators were still good eventhough I see foams when I released the fluid? I checked them out by inserting a rod and pushed hard to see if it could go deep inside but it did not move because the diaphram was still intact filled with gas.

I am just a little upset because I could have solved the problem by replacing $2.50/ea bushings vs $110/ea accumulators.
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1991 420SEL Project Car (Completed and rides beautifully) http://www.peachparts.com/shopforum/showthread.php?t=112321
2000 BMW 740IL
2000 Integra Type R - Track Car - SOLD
2005 S2000 - Track Car
06 C230 Sport
89 560SL
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  #4  
Old 01-19-2005, 02:55 PM
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I feel your pain. I just replaced my fuel injectors and fuel filter on my 190 and spent $140 on the parts only to find that was not the problem and it was actually a clogged set of downpipes to my cat! Sucks really but now at least I know that the injectors are not a problem!
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  #5  
Old 01-19-2005, 03:12 PM
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There are two rubber bushings for the upper strut mount, exchange both! I did it yesterday and it cured an occasional "clunk" I had at low speed. Alternatively, the lower mounting of the hydropneumatic shocks might be gone. If that's the case, you need to replace them.
Are all links tight?
BTW I also replaced the accumulators with little improvement in ride quality, and there was some foam from the old ones too. But accumulators wear out, so it is no waste to change them, even if it was slightly premature.
Good luck, Bruno
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  #6  
Old 01-19-2005, 06:48 PM
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Thanks, I have ordered the bushings and will change them out and report back the results.
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1991 420SEL Project Car (Completed and rides beautifully) http://www.peachparts.com/shopforum/showthread.php?t=112321
2000 BMW 740IL
2000 Integra Type R - Track Car - SOLD
2005 S2000 - Track Car
06 C230 Sport
89 560SL
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  #7  
Old 01-19-2005, 07:23 PM
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Rest easy, your money most likely wasn't wasted on new accumulators. You did say the fluid was foamy...good sign of a blown diaphram, by blown I don't necessarily mean ruptured but allowing the nitrogen to pass through. The foam was most likely from the nitrogen.
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'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.
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  #8  
Old 01-20-2005, 05:15 AM
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I had the same problem. Did the accumulators and had a thunk. It was the bushings.
You`ll have to remove the seat to get to them and crack the hydro line to do the bottom bushing. YOU NEED TO DO BOTH. The top one might look ok, but the bottom bushing will be mushroomed. When the acumulators go bad they hamer the bushings.

John
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  #9  
Old 02-07-2005, 01:50 AM
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Thumbs up just wanted to keep you guys posted.

I finally had the time to replace the upper strut bushings today and no more "kaboom" over pot holes or rough road. The bushings were pretty much gone. They are only about half tall comparing to the new ones. The ride is now so SMOOTH.. I finally get the ride back to how it used to be... THANKS!!!
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1991 420SEL Project Car (Completed and rides beautifully) http://www.peachparts.com/shopforum/showthread.php?t=112321
2000 BMW 740IL
2000 Integra Type R - Track Car - SOLD
2005 S2000 - Track Car
06 C230 Sport
89 560SL
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