Mercedes-Benz W123 steering play and steering idler
How do I adjust the steering play on a Mercedes-Benz W123?
The play is adjusted with the hex socket screw and its locknut on top of the steering box, in small steps of at most a quarter turn, with a test drive after each adjustment. Forum instructions disagree on which direction reduces the play and on what the screw actually adjusts, so check the workshop manual first. Steering is safety-critical, so have a workshop check the result.
What happens if the W123 steering adjusting screw is too tight?
The steering becomes stiff and the steering wheel does not return properly to the straight-ahead position. If left too tight for a long time, the box wears and the bearings can be damaged, so the play should not be removed completely.
What can cause W123 steering looseness if adjusting does not help?
First check that there is fluid in the power steering, because an empty system causes looseness. If the box is worn in the centre range or the looseness is in the worm screw, adjusting is not enough and the box must be repaired or replaced.
How do I fix play in the W123 steering idler?
The idler is on the opposite side from the steering box. You can feel the play by wobbling the centre bolt. A repair kit is available: the old rubber-metal bushings are replaced with new ones. Do not overtighten the bolt, because the steering would become stiff. The wheel alignment does not need to be adjusted after the repair.