Mercedes-Benz E-class 1998 Emergency Operation - Manual (Page 34)

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5. Remove the protective cover from
the jack support tube opening by
inserting the screwdriver (supplied
in the tool kit) in the opening and
prying it out.
The tube openings are located
directly behind the front wheel
housings and in front of the rear
wheel housings.
6. Insert jack arm fully into the tube
hole up to the stop. Place jack
on firm ground. Position the jack
so that it is always vertical
(plumb-line) as seen from the
side (see arrow), even if the
vehicle is parked on an incline.
7. Jack up the vehicle until the
wheel is clear of the ground.
Never start engine while vehicle
is raised.
8. Unscrew upper-most wheel bolt
and install alignment bolt (1)
supplied in the tool kit. Remove
the remaining bolts. Keep bolt
threads protected from dirt and
sand.
9. Remove wheel. Grip wheel from
the sides. Keep hands from
beneath the wheels.