Replacing the shock absorbers and coil springs on a Mercedes-Benz W124 (often referred to simply as the Mercedes 124) is a relatively complex task and requires mechanical expertise. This procedure involves disassembling and reassembling a significant portion of the vehicle's suspension system. Here's a general overview of the steps involved:

Tools and Materials You May Need:

  • Shock absorber and coil spring assembly (new)
  • Spring compressors
  • Socket set and wrenches
  • Torque wrench
  • Jack and jack stands
  • Pry bar or ball joint separator
  • Safety equipment (gloves, safety glasses)

Procedure:

  1. Safety Precautions:
    • Ensure the vehicle is parked on a flat, stable surface, the engine is turned off, and the handbrake is engaged.
    • Wear safety gloves and glasses to protect your hands and eyes.
  2. Raise the Vehicle:
    • Lift the front or rear of the vehicle using a suitable jack and secure it with jack stands. Make sure the vehicle is safely supported.
  3. Remove the Wheel:
    • Remove the wheel from the corner of the vehicle where you'll be replacing the shock absorber and coil spring.
  4. Disconnect Components:
    • Disconnect any components that attach to the shock absorber or coil spring, such as brake lines, ABS sensors, sway bar links, and the stabilizer bar, if present.
  5. Disconnect the Shock Absorber:
    • Use a socket set and wrenches to disconnect the upper and lower mounting bolts or nuts for the shock absorber. This may require using a ball joint separator or a pry bar to free the lower control arm from the shock absorber.
  6. Remove the Coil Spring:
    • Use a spring compressor tool to compress the coil spring, allowing you to remove it safely without tension. Carefully disconnect the coil spring from the upper and lower spring seats.
  7. Install the New Coil Spring:
    • Place the new coil spring into the spring seats, ensuring it's correctly positioned and aligned.
  8. Reconnect the Shock Absorber:
    • Reattach the shock absorber to the vehicle's suspension components, using the upper and lower mounting bolts or nuts. Make sure the shock absorber is securely in place.
  9. Reconnect Components:
    • Reconnect any components you detached earlier, such as brake lines, ABS sensors, sway bar links, and the stabilizer bar.
  10. Tighten All Fasteners:
    • Using a torque wrench, tighten all the mounting bolts and nuts to the manufacturer's specifications.
  11. Repeat for Other Side:
    • If you're replacing the shock absorbers and coil springs on both sides of the vehicle, repeat the above steps for the other side.
  12. Reinstall the Wheel:
    • Carefully reinstall the wheel and tighten the lug nuts.
  13. Lower the Vehicle:
    • Carefully lower the vehicle to the ground.
  14. Perform Alignment and Testing:
    • After replacing the shock absorbers and coil springs, it's essential to have a wheel alignment performed to ensure proper wheel alignment. Test the vehicle for proper suspension performance and handling characteristics.

Replacing shock absorbers and coil springs on a Mercedes W124 is a complex task and should be performed by experienced mechanics or technicians. Improper installation can affect the vehicle's handling, safety, and ride comfort. If you're not confident in your ability to perform this task, it's highly recommended to seek professional assistance.