Headlamp and Fog Lamp - Adjustment: Overview

9233mercedes01

REF. NO. MBNA 82/60


TO:
OUR MERCEDES-BENZ PASSENGER CAR DEALERS

DATE:
May 1992


SUBJECT:
MODEL 140
A. HEADLAMP ADJUSTMENT/OPTICAL RECALIBRATION
B. FOG LAMP ADJUSTMENT

The headlamps in model 140 are equipped with on-board aiming devices, which simplify the headlamp adjustment procedure. The aiming pads on the headlamp glass, known from previous models, are no longer required and have been eliminated. The use of on-board equipment to aim the headlamps has also eliminated the need for a workshop headlamp aiming device.

The adjustment procedures described in the Owner's Manual are repeated herein. Adjustment of the headlamp and fog lamp aim may be required periodically.

This Service Information also provides information on optical recalibration of the headlamps. Optical recalibration is not a routine procedure and is only required when replacing the complete headlamp unit if damaged or after accident repair.


A. HEADLAMP ADJUSTMENT/ OPTICAL RECALIBRATION

HEADLAMP ADJUSTMENT

Prepare vehicle for headlamp adjustment:

^ Correct tire pressure,
^ Drive unloaded vehicle slowly onto a level surface (check with carpenter's level) without abruptly applying service brake which would alter vehicle level,
^ Load driver's seat with approx. 75 kg (165 lbs.) or one person, ^ Open hood,
^ Remove the two access covers in the front crossmember above the headlamp units,
^ Move retaining clips on back of headlamp units and remove covers.





1. Perform vertical adjustment of headlamp by turning adjustment screw (6) so that the air bubble in the level (1) is centered on the "0" mark (Figure 1).

Note:
Slight variations of the bubble from the exact center of the "0" mark do not indicate a need for headlamp adjustment.

2. Confirm horizontal adjustment of headlamp. If necessary, turn adjustment screw (7, Figure 1) so that the pointer (5, Figure 2) for the scale (4, Figure 1) is aligned with the same mark as the other pointer (3, Figure 2) and scale (2, Figure 1). Do not loosen the screws holding down the pointers or move the pointers. If either pointer is moved, optical recalibration will be required.

3. Reinstall headlamp unit covers and access covers in crossmember.