Chevrolet 10 Series 1968, Service Manual, Page: 589 / 713

ELECTRICAL—BODY AND CHASSIS 12-4
VERTICAL ADJUSTMENT SCREW
F ig . 5-Headlam p V e rtica l Adjustment
HOW TO SELECT A LEVEL AIMING AREA
1. Select area you believe to be level.
2. Remove headlamp bezels and install Aimers on each
headlamp (fig. 3) making sure aiming lugs engage
smooth inner ring of the Aimer. To install Aimer,
press firm ly on the knob extending out from the
center of the Aimer base. This forces the suction
cup into place on the Sealed Beam unit.
3. Loosen the slider knob beneath the aimer arm and
set the numeral "2" in the DOWL view window (fig.
7). Back vertical lamp adjusted out on each lamp
until bubble is outside of black line of vial, then
center bubble in between black line of vial by turning
clockwise.
4. After both bubbles are centerd, turn the car around
end for end, making sure the tires are in the spots
made on the floor before the car was moved.
5. If the bubbles are still within the two outside black
marks on the vials, the floor is level enough to use
the Aimer as it comes from the factory.
NOTE:
A quick level check can be made by
using the T-3 Safety-Aimer as a level. Use with
a true eight to ten foot two by four as an exten­
sion. Make sure pads on base of Aimer are
used. Place the board where you expect the
wheels to be and take readings as outlined above.
6 . If either bubble moves outside the black lines of the
vial there is too much slant to the floor. Try driving
the car in at different angles onto the aiming area.
If bubbles can not be centered follow procedure under
"How to Compensate for Unlevel Floor."
NOTE:
When level portion of floor is obtained,
mark tire spots on floor so spots can be used
next time without calibrating Aimer.
F ig . 6-Rem oving Aim er from Headlamp
F ig . 8-Turning Level Adjusting Screw to C alib rate Aim er
CHEVROLET TRUCK SERVICE MANUAL