Genuine Mercedes-Benz 190E Steering Knuckle

Mercedes-Benz 190E Steering Knuckle Parts and Q&A

• Steering Knuckle
  124-330-04-20
  Q: How to remove and refit the steering knuckle and associated components on Mercedes-Benz 190E?

  A:

  New Shock Absorber to steering knuckle lower bolts and upper bolt nut, a steering rod balljoint nut, and a lower arm balljoint clamp bolt nut will be required on refitting. Firmly apply the parking brake, jack up the front of the vehicle, and support it on axle stands before removing the relevant front roadwheel. If the steering knuckle is to be renewed, remove the hub assembly. For refitting the steering knuckle assembly, slacken and remove the two bolts securing the brake caliper mounting bracket to the knuckle, then slide the caliper assembly off the disc, discarding the caliper bolts and using new ones on refitting. Tie the caliper to the front suspension coil spring to avoid strain on the hydraulic brake hose, and remove the wheel sensor on models with ABS. Slacken and remove the nut securing the steering rod balljoint to the steering knuckle, then release the balljoint tapered shank using a universal balljoint separator. On models equipped with ASD, if work is on the right-hand side, undo the retaining bolts and remove the wheel acceleration sensor, taking care not to drop or knock the sensitive ASD sensor. Support the lower arm while the steering knuckle is removed by positioning a jack and block of wood underneath or using a suitable spring compressor. Slacken and remove the two lower bolts securing the strut to the shock absorber, then slacken and remove the nut and washer to withdraw the upper bolt securing the shock absorber to the steering knuckle. Free the steering knuckle from the shock absorber, then slacken and remove the lower arm balljoint clamp bolt and nut. Free the steering knuckle from the lower arm balljoint and remove it from the vehicle, inspecting for signs of wear or damage and renewing as necessary. Clean the threads of the steering knuckle lower bolt holes before engaging the knuckle with the lower arm balljoint stud, inserting the clamp bolt, fitting the new nut, and tightening it to the specified torque while filling the steering knuckle clamp split with sealant to prevent corrosion. Locate the knuckle correctly with the shock absorber, ensuring the knuckle peg is in the hole, then insert the steering knuckle upper retaining bolt and washers, fitting the new nut. Fit the two new lower bolts securing the shock absorber to the knuckle, push down on the steering knuckle axle to contact the shock absorber, hold the knuckle in position, and tighten the upper bolt nut and both lower bolts to the specified torque. Remove the jack or spring compressor and connect the steering rod balljoint to the knuckle, fitting a new nut and tightening it to the specified torque. Fit the hub assembly, remove all traces of locking compound if the hub was not disturbed, and slide the caliper into position over the disc, ensuring the pads pass either side of the disc. Fit the new mounting bolts and tighten them to the specified torque, then refit the ASD sensor to the hub if necessary, securely tightening its retaining bolts. Finally, refit the roadwheel, lower the vehicle to the ground, and tighten the wheel bolts to the specified torque.