SLK350 Suspension fitted, 2 Broken Springs. - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 07-05-2015
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SLK350 Suspension fitted, 2 Broken Springs.

I had been planning on replacing my suspension due to age.

Over the last few months I had noticed a clanking/chinging noise from the near side when going over pot holes and man hole covers, so last weekend my Brother and I jacked up the n/s/f to see what the problem was.

"There's the problem" my brother says, and pulled out nearly an entire coil of broken spring, the part which locates at the bottom of the shock.

So this week I ordered the following,

2 X front springs, yellow-blue-blue colour code (Merc. dealer). Sport option.
2 X rear springs, white-grey-grey colour code (Merc. dealer).
2 X front shock top mounts, in case bearings were shot (Merc. dealer).

2 X Bilstein B6 front shocks (Bilstein direct).
2 X Bilstein B6 rear shocks (Bilstein direct).

The shocks were delivered within 2 days and the stuff from the Mercedes dealer were picked up yesterday. Whilst at the dealers I also bought 2 X gas struts for the boot lid, for the sake of about Ł22 + vat for the pair I thought I would try them, I now know they were definitely needed, so a cheap and simple fix.

Saturday afternoon we replaced the front suspension, or I should say, after getting stopped in our tracks we replaced the front suspension.

My spring compressors would not compress the springs enough, so a dash to Machine Mart and we bought this spring and strut compressor, https://www.machinemart.co.uk/shop/p...rut-compressor

Today we replaced the rear suspension, as we have not got the Mercedes type rear spring compressor we had to lower the lower control arm to clear the spring.

When we dropped the lower control arm on the o/s/r we found that spring was also broken.

My ramblings are just a reminder to perhaps have a check of certain components as I had no idea one of the rear springs was also broken.

I now intend to get the suspension checked over and have a full alignment carried out by a specialist. There also appears to be a height difference of 15mm from the near side to the off side. Possibly the suspension needs more time to settle?
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#2 Old 07-05-2015
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It's very rare to break a coil spring, and you broke two or three? You must have giant pot holes in England.

That's a very nice spring compressor for little money. It's the perfect unit for this job. BTW, if you have the Sports Pkg, 0.5" drop in the front, the correct shock is the B8. There isn't any difference in the rear regarding the shock & coil.

15mm is a bit over 0.5", and that's unacceptable. At most, the variance shouldn't exceed 0.25" I'm not sure if you are talking about the front or the back. Anyway, I suspect the coils aren't seated properly in the upper and lower spring seats, or one or both are missing.

When checking ride height, do it on a level floor and measure from the inner lip of the fender, using a yard stick, to the floor.
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#3 Old 07-06-2015
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Originally Posted by DSSG View Post
It's very rare to break a coil spring, and you broke two or three? You must have giant pot holes in England.

That's a very nice spring compressor for little money. It's the perfect unit for this job. BTW, if you have the Sports Pkg, 0.5" drop in the front, the correct shock is the B8. There isn't any difference in the rear regarding the shock & coil.

15mm is a bit over 0.5", and that's unacceptable. At most, the variance shouldn't exceed 0.25" I'm not sure if you are talking about the front or the back. Anyway, I suspect the coils aren't seated properly in the upper and lower spring seats, or one or both are missing.

When checking ride height, do it on a level floor and measure from the inner lip of the fender, using a yard stick, to the floor.
Very rare !!??

Its so common over here in uk land .
You see the coil spring broken sections at roundabouts at the kerb at traffic lights .

Its such a common thing .
Its like coming across headlight bulbs gone .

The roads here are absoultlely SH.T !!

Its common practise to swerve to avoid them .
So common to se cars fail mot because of them .

The state of british roads and seems to be getting worse .
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#4 Old 07-06-2015
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The height variance is across the front axles from near side to off side.

I know the B8 shocks are recommended but I did not want suspension that was too harsh, as said, the roads over here are in a shocking state.

After test driving the new suspension I'm more than happy with the results.
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#5 Old 07-06-2015
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Originally Posted by Grandpa Munster View Post
The height variance is across the front axles from near side to off side.

I know the B8 shocks are recommended but I did not want suspension that was too harsh, as said, the roads over here are in a shocking state.

After test driving the new suspension I'm more than happy with the results.
`

This is a a common mistake when picking shocks. It is the spring not the shock that determines the quality of the ride. All the shock does is damp the oscillations of the spring.

When you lower the ride height, in this case 0,5", the height of the spring has to be shortened. To make up for the reduced movement in the spring, it is made stiffer so it won't allow the suspension to bottom out on a bad bump. Also there is a rubber "bump stop" contained within the coil to help prevent this too.

The result is a stiffer spring requires a higher rate shock, or in your case, the B8. Your ride would have actually been better with the B8 shock. In any case, most of the improvement you are feeling is due to the replacement of the coils.

As far as the difference in ride height, it is always a good idea to measure the height of the coils. Sometimes they are different. Also the coils have to fit into the spring seats a certain way along with the lower and upper spring seats. Again this is a common mistake not fitting the coils correctly.

I'll have to worn you that unless you have a G-Wagon, no car can handle pot holes at speed. You'll do serious damage to your suspension.
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#6 Old 01-08-2018
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Hi, I am just about to remove / replace front shocks on my SLK280 R171 - Removing the Struts is fairly straightforward - I am considering buying the: https://www.machinemart.co.uk/p/strut-compressor/

Which I think is the same one you mention - will this be right for my SLK R171??

Many thanks in anticipation, And (New Member)
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#7 Old 01-08-2018
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Yes, my mechanic has one of those.
You will need those as well
1/2-Inch Drive Tx-Star Socket Bit
I manage to snap 3 while removing my struts.

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#8 Old 01-08-2018
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Originally Posted by i860 View Post
Yes, my mechanic has one of those.
You will need those as well
1/2-Inch Drive Tx-Star Socket Bit
I manage to snap 3 while removing my struts.


Breaking tools is so much FUN!
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#9 Old 01-08-2018
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Nooooooooooooooooooooooooooo
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#10 Old 01-08-2018
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Yes, my mechanic has one of those.
You will need those as well
1/2-Inch Drive Tx-Star Socket Bit
I manage to snap 3 while removing my struts.

There is a knack of undoing them
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#11 Old 01-08-2018
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Quote:
Originally Posted by Angela Whurr View Post
Hi, I am just about to remove / replace front shocks on my SLK280 R171 - Removing the Struts is fairly straightforward - I am considering buying the: https://www.machinemart.co.uk/p/strut-compressor/

Which I think is the same one you mention - will this be right for my SLK R171??

Many thanks in anticipation, And (New Member)
Sadly this is one of those tools that you will most likely only use once.

It is a shame you do not live closer to me. I would have fitted the springs for you.
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#12 Old 01-08-2018
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That is why you use an impact wrench. Throw a torx socket on the 1/2 impact and it comes right off. Normally you only have to use the inner torx when you are putting the new one on.
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