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Pelican Technical Article:

Rear Spring Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$40 to $300

Talent:

**

Tools:

Jack, jack stands, 19mm, 17mm socket and wrenches, Mercedes-Benz Spring Compressor BM-924-0231

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New struts and springs

Hot Tip:

Loosen your wheels before lifting the car

Performance Gain:

Better handling

The springs work in tandem with the shocks to support the vehicle, retain proper weight transfer while driving and help smooth out the ride. While you can easily replace the stock springs when they wear out or get damaged there are a host of after-market shocks and springs available. A new set of shocks and springs can do everything from stiffen up the ride to lower the ride height. Shocks and springs are designed to work together and just changing your shocks or springs can result poorer performance than when you started, and in some circumstances a dangerous situation. Always make sure the shocks and springs you purchase a designed to work in tandem with each other.

Begin by safely raising and supporting your vehicle.

The rear suspension system of the W124 is a very confined space to work in and while we have heard of some people being able to get the spring out without removing several components on the vehicle we do not see how to safely accomplish this.
Figure 1

The rear suspension system of the W124 is a very confined space to work in and while we have heard of some people being able to get the spring out without removing several components on the vehicle we do not see how to safely accomplish this. To get the spring (red arrow) out you will first need to remove the lower control arm cover, the shock (yellow arrow) and sway bar drop link (green arrow). Please see our articles on shock and drop link replacement.

I highly recommend you use spring compressor tool BM-924-0231 for Mercedes-Benz.
Figure 2

I highly recommend you use spring compressor tool BM-924-0231 for Mercedes-Benz. Use of a different tool can cause damage to both you and the vehicle. Warning: Never use air impact tools on the Mercedes style spring compressor.

Place the disks for the compressor as far away from each other as possible; meaning at the highest and lowest points you can get on the spring (red arrows).
Figure 3

Place the disks for the compressor as far away from each other as possible; meaning at the highest and lowest points you can get on the spring (red arrows).

Expand the compressor and insert it up through the disks and spring making sure that it sits in the pockets on the upper spring in the compression position.
Figure 4

Expand the compressor and insert it up through the disks and spring making sure that it sits in the pockets on the upper spring in the compression position.

Use a 19mm socket and compress the two disks together compressing the spring.
Figure 5

Use a 19mm socket and compress the two disks together compressing the spring. The spring will be under a lot of force so make sure the compressor is properly seated in the upper seats before compressing.

Next you will need to lower the control arm from the wheel hub to remove the spring.
Figure 6

Next you will need to lower the control arm from the wheel hub to remove the spring. Using two 19mm sockets loosen the nut holding the control arm to chassis but do not remove the bolt.

Remove the nut and bolt connecting the control arm to the wheel carrier.
Figure 7

Remove the nut and bolt connecting the control arm to the wheel carrier. Hold the control arm in place while removing the bolt

While holding the spring and control arm, carefully swing the arm down from the wheel carrier and remove the spring.
Figure 8

While holding the spring and control arm, carefully swing the arm down from the wheel carrier and remove the spring. Installation is the reverse of removal.

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