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Home >> Mercedes Benz >> 2017 >> GT AMG >> Repair and Diagnosis >> Suspension >> Wheels & Tire System >> Wheels, Chassis Alignment -- 190 Chassis >> Testing & Repair >> Replace Threaded Connection - AR40.20-P-0263-01RQ

Replace Threaded Connection - AR40.20-P-0263-01RQ

Model 190, 197 

  1. Raise vehicle at corresponding jack support point (vehicle suspension must extend).
  2. Detach bolt (19a), nut (19d), washers (19b) and adjusting shim (19c) from lower transverse control arm (17).

    Shown on front bearing of lower transverse control arm on front axle 

    G16677871Courtesy of MERCEDES-BENZ USA

    IMPORTANT The front threaded connection on the lower transverse control arm (17) must be loosened to correct the camber.

    The rear bolted connection on the lower control arm (17) must be unfastened to correct the caster.

    NOTES If the bolted connection has been unfastened, then the following parts must always be replaced too: Bolt (19a), washers (19b), adjusting plates (19c) and nut (19d)

    Otherwise the axle geometry may change when the vehicle is driven.

    Adjust camber and caster on front axle. 

  3. Insert the new adjusting shims (19c) as determined to adjust camber and caster.

    IMPORTANT The adjusting shim number (a) is stamped on to the adjusting shim (19c). Make sure that two adjusting shims with the same adjusting shim number are used on each transverse control arm rubber bushing. The notch (arrow) must always point outwards toward the wheel.

    G16677872Courtesy of MERCEDES-BENZ USA

    Adjust camber on rear axle. 

  4. Insert the new adjusting shims (19c) as determined to adjust camber.

    IMPORTANT Caster cannot be measured and adjusted on the rear axle.

    IMPORTANT The adjusting shim number (a) is stamped on to the adjusting shim (19c). Make sure that four adjusting shims with the same adjusting shim number are used on each transverse control arm (both elastomer bearings) rubber bushing. The notch (arrow) must always point outwards toward the wheel.

    G16677873Courtesy of MERCEDES-BENZ USA

    IMPORTANT If there are no suitable adjusting shims for the required adjustment, the chassis is outside the tolerance and cannot be adjusted. The chassis, suspension and load-bearing body panels must then be checked for damage.

  5. Install new bolt (19a), new nut (19d) and new shims (19b).

    IMPORTANT Make sure that the adjusting shims (19c) are inserted all the way into the corresponding lower transverse control arm mount. Do not yet tighten the nut (19d) so that the elastomer bearings of the lower transverse control arm (17) turn when the vehicle is rocked to settle the suspension.