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Pelican Technical Article:

Front Coil Springs Replacement

Kerry Jonsson

Time:

4 hours4 hrs

Tab:

$250

Talent:

**

Tools:

13mm, 19mm, 22mm 5mm Allen head, socket with ratchet, swivel and extension

Applicable Models:

Mercedes-Benz R129 (1990-02)

Parts Required:

Front coil springs

Hot Tip:

Spray bushings with lubricant for easier installation

Performance Gain:

Eliminate clicking noise when changing directions or going over bumps

Complementary Modification:

Change over to polyurethane bushings for a tighter ride.

The springs on your car support the weight of your vehicle. Your shock absorbers do help a little with compression dampening but it is mainly there to control the reaction of the spring being compressed. Each suspension corner has its own spring and supports its corner of the car. Over time springs will lose their tensile strength and wear out thus needing replacement. If your car tends to wallow in the corners and just doesn't feel the way it did when you first purchased it, that could be an indication that you need new coil springs.

Lift and support the front axle of the vehicle. You have to remove the tires to perform this job and it does make access much easier since you may not have access to an automotive lift. See our tech article on jacking and supporting your vehicle and removing the front tires.

The procedure to replace the front coil springs is the same for both the left and right sides. These pictures are of the left side of the vehicle. It is recommended you replace both sides at the same time to keep your handling neutral.

Remember your car may have been serviced before and parts replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches.

Remove the two 19mm fasteners that hold the caliper onto the spindle.
Figure 1

Remove the two 19mm fasteners that hold the caliper onto the spindle. Remove the caliper from the spindle and support it. Do not let it hang by the brake line because this can damage the line. If the brake pads are spread apart a little, they will clear the brake rotor when removing. You can use a commercially available brake pad spreading tool to push the brake pads back in the caliper, once the caliper is removed.

ThisPicture illustrates the left side wheel well.
Figure 2

ThisPicture illustrates the left side wheel well. Remove the 19mm strut fastener (green arrow).You will have to counter-hold the back of the bolt with a 19mm wrench,Pictured here.

Pull the washer and bolt out of both the shock absorber and spindle mount.
Figure 3

Pull the washer and bolt out of both the shock absorber and spindle mount. The ABS sensor connector is also held on with this fastener, it can hang loose while you remove the shock absorber.

Put a jack underneath the lower control arm to support the arm and spindle while disconnecting fasteners.
Figure 4

Put a jack underneath the lower control arm to support the arm and spindle while disconnecting fasteners. Working at the base of the shock absorber, remove the two 19mm fasteners (green and yellow arrows) that hold the base of the shock absorber onto the spindle. One of the fasteners you cannot see (green arrow) because it is hidden behind the shock absorber in thisPicture.

With the base of the shock absorber loose, rotate it clockwise until you see the electrical connector bracket clipped on to the shock absorber body.
Figure 5

With the base of the shock absorber loose, rotate it clockwise until you see the electrical connector bracket clipped on to the shock absorber body. Push in on the locking tab (red arrow) and move the electrical connector mount in the direction of the blue arrow to remove it from the shock absorber. Grab the smaller harness (green arrow) and pull it away from its holder in the direction of the yellow arrow.

ThisPicture illustrates the engine compartment at the top of the left side shock tower.
Figure 6

ThisPicture illustrates the engine compartment at the top of the left side shock tower. Remove the 22mm fastener (green arrow) for the top of the shock absorber. If the shock absorber shaft spins with the fastener, insert a 5mm Allen head socket in the top of the shock shaft (yellow arrow) and counter-hold it with a ratchet.

Pull the shock absorber away from the spindle in the direction of the green arrow to remove.
Figure 7

Pull the shock absorber away from the spindle in the direction of the green arrow to remove.

Remove the two sway bar bracket fasteners (green arrows).
Figure 8

Remove the two sway bar bracket fasteners (green arrows).

Remove the sway bar bushing bracket from the lower control arm.
Figure 9

Remove the sway bar bushing bracket from the lower control arm.

Remove the sway bar bushings from the end of the sway bar.
Figure 10

Remove the sway bar bushings from the end of the sway bar.

You can disconnect the ABS sensor electrical connector to unplug the sensor.
Figure 11

You can disconnect the ABS sensor electrical connector to unplug the sensor. I chose to remove the two 6mm Allen head fasteners that hold on the ABS sensor to the spindle, then moved the sensor out of the way.

Using a 19mm wrench, remove the tie rod end fastener.
Figure 12

Using a 19mm wrench, remove the tie rod end fastener. If the ball socket spins with the fastener, counter-hold the ball socket using with a 5mm Allen head socket and ratchet asPictured here.

Using a tie rod end ball joint removal tool, separate the tie rod end from the mounting point in the spindle.
Figure 13

Using a tie rod end ball joint removal tool, separate the tie rod end from the mounting point in the spindle.

Slowly lower the jack until all of the energy is taken out of the spring.
Figure 14

Slowly lower the jack until all of the energy is taken out of the spring. Pull the spring out of the bottom perch in the lower control arm and pull the spring downward to remove it from its upper perch to remove it from the car. Be very careful in lowering the jack slowly.

Install a new or reused rubber spring cap on the new spring for installation.
Figure 15

Install a new or reused rubber spring cap on the new spring for installation. Installation is the reverse of the removal procedures. Fit the rubber cap on the upper part of the spring and insert the upper part of the spring in the upper spring perch. Fit the bottom of the spring into the lower control arm spring perch. Slowly jack up on the lower control arm until the shock absorber can be attached at both the top upper shock mount and the fasteners holes line up on the bottom of the shock absorber with the spindle. Tighten all fasteners and fit the ABS electrical connector bracket to the shock absorber spindle mount. Install the ABS sensor and tighten its fasteners. Clip the wiring harnesses onto their mounting bracket on the strut. Install the brake caliper and tighten the fasteners. Fit the wheel and drop the car.

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Comments and Suggestions:
nate Comments: used this for my w140,works perfect same front end
May 18, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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