You will need the Mercedes manual or cd to see the way Mercedes does it.
While many cars have sunroofs, and there are many mechanics out there who
can repair them, Mercedes uses a torque jig that sits on the roof and allows
matched torque adjustments for both rails. Because the timing is critical,
you would need something to measure the torque so the roof would smoothly
move forward and backward. When my 124 had a broken rail, I was told by my
friend who worked in a MB parts dept., that if I really wanted my sunroof to
work as new, I should have a MB mechanic fix it. The trunk assembly is the
emergency control for when a cable breaks and you need to close the sunroof.
Why do you need to adjust it? The motor assembly does not need to be
opened when replacing the cable or even the assembly itself.
The knob is for emergency purpose, for example, the sunroof does not
close and it is going to rain...
Did you remove the knob and turn the bolt inside? Oops, that does need
special way to preset the tension. However, the assembly internal works
like a clutch. I believe the purpose is to save the motor if cable or
sunroof gets stuck. If both cable and sunroof work fine, most tension
setting should do the job.
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