Porsche 911 Carrera - Manual (Page 321)

Lateral adjustment of the headlights should be
carried out at a specialist workshop with an optical
adjustment unit.
Distance
Visual aim shall be performed at not less than
7.5 m (this value is a rounded down conversion
from the 25-foot distance typical of field aim
using a screen). The 7.5 m (24.6 ft.) distance is
measured from the headlamp lens to the viewing
screen.
Floor
The surface upon which the vehicle rests is flat and
approximately level.
Screen
The screen upon which headlamp beams are
projected is perpendicular to the floor and the
vehicle’s longitudinal axis, flat, uniformly light in
color, unobstructed, and wide and high enough
to accommodate the vehicle beam patterns to be
aimed.
The screen should be wide enough to provide
at least 1 m (3.3 ft.) of space outboard of the
vehicle’s headlamp spacing.
Adjustment screws
Detach side carpeting in luggage compart-
ment. Unscrew plastic nut A. Open the cover
of the appropriate adjustment screw. The set-
ting is adjusted by turning the hexagon socket
screws right or left, as appropriate.
Practical Tips, Emergency Service
319