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  #1  
Old 01-06-2010, 10:49 AM
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W108 rear suspension spring

Hello Peaches,

I have some fresh experience to share regarding the rear suspension. Since I purchased the car three years ago, the rear wheels have always looked odd sitting under the car at an angle. I have always been told that it is normal, but it doesn't look normal to me. Since the car seemed to ride ok I didn't bother looking for a solution.

Last week my in-laws were visiting from Florida. I offered to drive the family to dinner in my Mercedes since it is the largest car. With five large passengers, the car was scraping the pavement. I am pretty sure that Mercedes designed the SEL to carry 1,000 pounds.

My friend Don shared the solution to the sagging old spring. Don drives a 1974 MB 240D. He bought a kit called "Spring Helpers" that came with four pieces, and he only needed two of them. Don installed two of the Spring Helpers on my 1973 W108 and the suspension is riding like new.

I have not tested with five passengers yet, but the wheels are sitting up pretty and the ride smooth and responsive. I have read posts here regarding sagging springs and wheels tucked in like mine. I have not read about Spring Helpers here on the forum so I thought I would share my experience.

I hope this helps some of our friends. It made me very happy.

Jeffrey
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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1973 280Coupe ~ Goldy Locks
1987 300SDL ~ Grey Ghost
The Universe is Abundant ~ Life is GOOD!
Spare parts 1953-1973 http://s233.photobucket.com/albums/ee24/brocpoet/
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  #2  
Old 01-06-2010, 01:21 PM
Tony
 
Join Date: Oct 2005
Location: Genoa, Nv
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Hi,
It sounds like you have a collapsed compensator. Look at your rear axle right above the differential and see if there is a spring or a large tube about 3" in dia. I would not install spring spacers to correct the problem-It will affect the ride and suspension travel.
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  #3  
Old 01-06-2010, 08:14 PM
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Indeed, the hydro-pneumatic compensator actually self-levels the suspension, so if with 5 passengers you scraped, either you have a spring and not a compensator that's shot, or you have a shot compensator.

Most people replace the compensator w/a spring, since IF YOU ARE LUCKY you can get a new/rebuilt one for $800. They usually run $1500 when you're lucky enough to find one, but every now and then a super-cheap NOS one pops up on eBay or the like.
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  #4  
Old 01-06-2010, 08:52 PM
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That's precisely true... the compensator in my 111 works as it should. Peek underneath and you can visually see if there is a spring, or if there is a compensator there you can check the seals for leaks, to start.
Basically the car's hydropneumatic compensator ensures that the rear sits right and level.
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  #5  
Old 01-11-2010, 04:20 PM
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Location: Finland
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Here You can have Your hydropneumatic spring renewed. With a rucksack of dollars..

http://tinyurl.com/ylxlsvw
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  #6  
Old 01-25-2010, 12:17 AM
xaliscomex
 
Join Date: Feb 2006
Location: Ventura County, CA
Posts: 326
Boge

Spoke to John at mb classic center-orange county. Only 2 (Boge) hydro- pneumatic compensators left and they are reserved for only those vehicles that come in to get restoration service. I own a 1970 280 SEL 2.8 (108.019) and had the same camber problem. Switched from hydro compensator to spring conversion kit. No problems with camber. To be honest the rear of my car sits a little high for my taste.
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  #7  
Old 01-25-2010, 07:50 AM
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Quote:
Switched from hydro compensator to spring conversion kit.
Where did You get that?

IŽd buy two kits right away..
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  #8  
Old 01-25-2010, 08:58 AM
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http://www.allpartsexpress.com/ShopByVehicle.epc?q=1972-MERCEDES--BENZ---80se--4.5--/--V8--45--0cc--4.5l--Gas--Fi-Rear--End--/--Suspension&yearid=1972%40%401972&makeid=MERCEDES+BENZ%40%40MERCEDES+BENZ%40%40X&engineid=1194634%40%40280SE+4.5+%2F+V8-4520cc+4.5L+GAS+FI%40%40280SE+4.5&catid=Rear+End+%2F+Suspension%40%40Rear+End+%2F+Suspension&subcatid=Compensator+Spring%2FBracket+Kit@@Compensator+Spring%2FBracket+Kit&mode=PA

All Parts Express (this forum's sponsors) sell it for $188.15 and shipping is free since it's over $100!

Last edited by Tomguy; 01-25-2010 at 03:18 PM. Reason: link to external parts suppliers is forbidden
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  #9  
Old 01-25-2010, 09:29 AM
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mine sags in the back because both my upper and lower spring pads rotted away
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  #10  
Old 02-20-2010, 12:03 AM
xaliscomex
 
Join Date: Feb 2006
Location: Ventura County, CA
Posts: 326
sagging

It's one thing to have a sagging problem and its another thing to have a camber problem where your tires cave in. I guess a racing wheel chair would be a great example.
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  #11  
Old 02-20-2010, 03:21 AM
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I cannot open the abovementioned link to AllPartsexpress. Or actually the whole site simply just wonŽt open with Firefox or Safari. Should I buy a PC and start using the Explorer..
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  #12  
Old 02-20-2010, 11:35 AM
xaliscomex
 
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spring

Mine is a mac book pro and I use safari. Was able to open the link.
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  #13  
Old 02-20-2010, 11:39 AM
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Location: Pompano Beach, FL
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febi makes the kit to change over from the hydraulic unit # 110 586 05 01
fit as a direct replacement in my car with just the spring also though..
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1966 200 Diesel
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1984 500SL
1989 560SEC Euro
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  #14  
Old 02-20-2010, 07:08 PM
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Join Date: Dec 2007
Location: Houston, Texas
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It has been two months since I added the "Spring Helpers". My compensator may have been weak, not completely worn out and needing replacement. I don't know...

What I do know is that I like the way the car is riding now. It feels normal. Hopefully I will have the opportunity to transport 4 large passengers again for the ultimate test.
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1962 220Sb ~ The Emerald Bullet http://www.youtube.com/watch?v=hx6tN1W48_o
1973 280Coupe ~ Goldy Locks
1987 300SDL ~ Grey Ghost
The Universe is Abundant ~ Life is GOOD!
Spare parts 1953-1973 http://s233.photobucket.com/albums/ee24/brocpoet/

Last edited by JeffreyNMemphis; 02-20-2010 at 07:21 PM.
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  #15  
Old 02-20-2010, 09:06 PM
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Do you know if they make them for the W114? How much did the kit cost? I've been waiting for an update on this one because my W114's ass drags in the mud (or she used to before I started the restoration.
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