Pic. 147. Adjusting screws block headlights: 1 - screw for adjusting the beam of light in the horizontal direction; 2 - screw for adjusting the beam of light in the vertical direction
A fully fueled and equipped car with a load of 75 kgf on the driver's seat is installed on a flat horizontal platform 5 m from a smooth wall or any screen (shield measuring about 2X1 m) so that the axis of the car was perpendicular to it. Before marking the screen, make sure that the air pressure in the tires is normal, and then rock the car from the side so that the suspension springs are installed.
Drawing on the screen (pic. 148) vertical lines: axial O and lines A and B passing through points E, corresponding to the centers of the headlights. These lines must be symmetrical about the center line of the vehicle. At a height corresponding to the distance of the centers of the headlights from the floor, line 1 is drawn and below it by 65 mm line 2 of the centers of light spots. Install the headlight adjustment knob (if it exists) on the instrument panel to the position corresponding to the load of the car with one driver.
Pic. 148. Scheme for adjusting the headlights
Turn on low beam headlights
Sequentially, first for the right headlight (the left is covered with a piece of cardboard or dark cloth or turned off), and then for the left (right closed) adjust by screws 1 (see fig. 147) and 2 beams of headlights. For correctly adjusted headlights, the upper border of the light spots must coincide with line 2 (see fig. 148), and the intersection points of the horizontal and inclined sections of light spots with lines A and B.
Headlight hydrocorrector
If the angle of inclination of the headlights has increased and the adjusting screw on the headlight unit fails to bring it back to normal, then they check for fluid leaks from the cylinders or tubes of the hydraulic corrector. Remove the slave cylinders from the block headlights and check the working stroke of the rods, which should be (7±0,5) mm.
The design of the hydraulic corrector is non-separable and in case of damage it is replaced as a whole, complete with cylinders and tubes. To replace, disconnect the tube clamps from the wire clamps. Remove the handle from the master cylinder and unscrew the nut securing it to the instrument panel. Disconnect the slave cylinders from the block headlights and push them with a sealant into the car interior. A new hydraulic corrector is installed in the reverse order.