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rear suspension question 2.5-16; bushes or more to it?
Topic Started: Wed Aug 19, 2009 11:31 pm (840 Views)
vaggeli
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supervillain in training
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My 2.5-16 has had REALLY bouncy rear suspensin of late...went for MOT recently and apparently SLS was alll fine, no weeping or anything, accumulators looked a bit tired but worked fine...and i wasnt too worried cos id done the typical "get ur mates to sit in it/get out, get in again" sls testing and it was self levelling fine.

BUT, my advisory for the MOT was badly worn rear suspension bushes. could this alone cause the bouncyness? should i look at getting new springs since the suspension will be in pieces? any other posibilities?

its rather annoying cos the front is perfect and the rear feels like a pogo stick. speed bumps are particularly evil, takes 2-3 seconds to stop bouncing.
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Will
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Highly Addicted
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Sounds like the accumulators for sure. How do you know that they are working fine?

They provide the damping in the self-levelling system. Almost certainly shot from your description - better to change early before it wrecks the bushes in the struts etc.

Will
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stwat
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It sounds like the spheres/accumulators have had it. Mine has got progressively worse over the last few months too. It is now rock solid at the back and is very uncomfortable to drive, Im getting mine replaced soon.
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shrekky
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Troll hunter
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bouncy means weak spheres..............replace soons as possible..........................rock solid stu ,means..........replace now !!! without fail..............or you will end up like steve,with a snapped shocker :S
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Michael
Needs Help
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Will
Wed Aug 19, 2009 11:40 pm
Sounds like the accumulators for sure. How do you know that they are working fine?

They provide the damping in the self-levelling system. Almost certainly shot from your description - better to change early before it wrecks the bushes in the struts etc.

Will
Now I know why mine bottoms out over a yump. :lol: :lol:
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stwat
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shrekky
Wed Aug 19, 2009 11:48 pm
bouncy means weak spheres..............replace soons as possible..........................rock solid stu ,means..........replace now !!! without fail..............or you will end up like steve,with a snapped shocker :S
That probably explains why i had to change one the other month!!! The top part was bent and knocking badly!!! i noticed a knmock from the other side the other day too. I have a spare strut thankfully so il change that at the same time.
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vaggeli
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supervillain in training
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thanks for the suggestions. This vindicates me a bit cos i was almost positive it was the accumulators and MOT place assured me they were "a bit old, but doing their job fine" and that it was all because of the bushes.

ill do both when i get back, should be good after that.

I mean, the car otherwise is practically brand new. gearbox rebuilt 5000 miles ago, engine rebuilt to evo2 spec 1000 miles ago (ps, dont bother doing it unless ur going forced induction cos its very much a "top end" engine), new ASD in 07, complete new front suspension in 06. new radiatior, new alternator last year. powerflow stainless exhaust in july. should be pretty good when this is done.
Edited by vaggeli, Thu Aug 20, 2009 1:07 am.
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bolide
Bolide
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Suspension spheres

There are two failure modes: rock hard with no travel and high & bouncy. Both mean new spheres needed

Nick Froome
www.w124.co.uk
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stwat
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bolide
Thu Aug 20, 2009 1:32 am
Suspension spheres

There are two failure modes: rock hard with no travel and high & bouncy. Both mean new spheres needed

Nick Froome
www.w124.co.uk
Many thanks for that info, Nick.

It seems i have the rock hard with no travel and vaggeli has the high and bouncy problem.

Mine also sits a bit low at the back. I take it thats also to do with the spheres being at fault? Its had a brand new strut on one side but still sits too low.
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vaggeli
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supervillain in training
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but mines not high... and it self levels seemingly fine...hmmm confusing. prolly still the spheres though cos that was my guess from when i got the car
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bolide
Bolide
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I was very confused about the two failure modes until someone pointed out that MB spheres are different to Citroen ones. Citroen ones have a diaphragm & gas for damping but the Mercedes ones have damping valves as well

I believe that the basic operation of W124 (and W201) rear SLS is similar to a Citroen BX except that Mercedes have spheres with damping valves and springs to set the static/unpowered ride height. Citroens have no springs hence they (eventually) sink when unpowered. Both have a height corrector valve (Citroen terminology) to set the ride height

It's a brilliant system and I think it's responsible for the superb ride W124 estates have

Nick Froome
www.w124.co.uk
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Uk Merc Man
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190e Leg-End
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i will have a pair of low mileage spheres for sale within the next couple of weeks...... :)
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vaggeli
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supervillain in training
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yes please! ill be back in the country soon, either 2 weeks or 4 weeks, not sure yet
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bolide
Bolide
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Ride height is set by the height corrector. It has a valve operated by an arm [41] that is linked to the arb by a rod with adjustable ends. The ends can seize and the rod can snap

The rod is your first port of call when dealing with height queries
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Nick Froome
www.w124.co.uk
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