w108 rear - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 10-20-2015, 08:01 AM Thread Starter
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w108 rear

Can anybody help ? 1967 250se w108 . Have replaced rear coil springs and shocks on both sides of car but it still seems to sit down a little. Think it still needs about 2in lift. Is there something else I need to do or replace ? Have been told to use coil spring boosters !!!! All replys welcome
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post #2 of 12 (permalink) Old 10-20-2015, 02:43 PM
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Have you got the spring between the two halves of the diff? The horizontal compensating spring?
The bottom spring perches on the trailing arms can be rotated into 3 positions - you will see holes in them - so this can adjust the height a bit
Lastly, you can get different thickness rubber mounts that sit between the coil spring and the spring perches (for both the main suspension coil, and also the little horizontal compensating spring).
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post #3 of 12 (permalink) Old 10-21-2015, 06:22 AM
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It sounds like you have the hydropneumatic compensator on top of the rear diff and it's failed. They are expensive to replace, so many of us replace them with a spring instead. Lots of write ups about doing the replacement on this site.
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post #4 of 12 (permalink) Old 10-21-2015, 06:26 AM Thread Starter
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Thanks. Will get working on that and see if that cures my problem
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post #5 of 12 (permalink) Old 10-21-2015, 06:56 AM
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Originally Posted by bogman View Post
Thanks. Will get working on that and see if that cures my problem

Where are you located bogman?

It would be interesting to learn the cause of the failure. The compensator spring is a pretty simple and obvious thing if you have it. I haven't seen the hydraulic compensator spring yet myself. I'm still learning these rear ends, and have parted a 1969 280s with a compensator spring, own a 1973 280se 4.5 with a compensator spring, and recent picked up a 1973 280sel 4.5 that had its rear end taken and replaced with a roller rear end of a 1968 280s. These rear ends are pretty interesting to me, the strange birds they are.

Some good compensator spring (both hydro and standard) pics here.
http://www.benzworld.org/forums/vint...placement.html

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post #6 of 12 (permalink) Old 10-21-2015, 12:40 PM Thread Starter
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Located in the Emerald Isle. I have to say I leave all the work to a trusted mechanic, every man to his own job. However I need to find out what the cause of the problem is for myself before I get him to spend hours working on it. I need to see a diagram of the workings , springs etc. and where they go, to understand what causes the car to sit down a bit.
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post #7 of 12 (permalink) Old 10-21-2015, 02:02 PM
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If you look in top of the differential the Hydro compensator looks like a big shock absorber. The spring is just a spring like this:
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post #8 of 12 (permalink) Old 10-22-2015, 01:29 PM Thread Starter
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Thanks Tony for photo. Now I know what is what. I have just taken a quick look under the back to see that I have the hydropneumatic type which seems to be leeking oil. Think I will replace it with the spring type as everybody says to replace the hydropnenmatic is very expensive. Can get the spring conversion kit for around €120 from dp depot in Germany. I still don't understand how this will cure my problem as the compensator spring is horizontal and I need about 2in vertical lift.
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post #9 of 12 (permalink) Old 10-23-2015, 05:34 AM
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Bogman, The spring or compensator push outward forcing the top of the wheels out and thus raising the diff. This in turn raises the body. The diff is two pieces with a pivot. See the picture posted above, notice how the spring is pushing outward.
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post #10 of 12 (permalink) Old 10-23-2015, 07:48 AM Thread Starter
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Thanks Kdjones. Just after jacking it up off the rear wheels to have a good look. When I let it down again it seems to sit up pretty good or maybe that's just an illusion. Thanks for the info and workings of the compensator. As I said think I will put on a new spring and hope for the best.
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