Checking the condition, replacing the brushes and adjusting the angle of the windshield wipers (BMW 3 Series E46)

1. Over time, road film accumulates on windshield wipers, reducing their effectiveness, so wipers should be washed regularly in a mild cleaning solution.

Checking the condition of the brushes and the initial position of the wiper arm

2. Windscreen wiper assemblies and blades should be inspected regularly. If inspection reveals hardening or cracks in the blade rubber, replace the blades. If inspection reveals nothing unusual, wet the windscreen, turn on the wipers, let them run for a while, and turn them off. Uneven marks from the blades on the glass or streaks on clean glass indicate that the blades should be replaced.

3. If the brushes do not clean the windshield well enough, the following reasons may be possible:

When your car goes through an automatic car wash, wax particles get on your windshield. These particles can be removed by adding a wax-dissolving detergent to your windshield washer fluid.

Filling the fluid reservoir with a glass cleaner with wax-dissolving properties can significantly improve the performance of the wipers. Grease-dissolving cleaners are not able to completely clean the glass.

If the brushes are damaged, they should be replaced.

The angle of installation of the windshield wiper arms does not correspond to the required one.

During operation of the windscreen wiper mechanism, the mounting nuts may become loose, so they should be checked and, if necessary, tightened each time the wipers are checked.

Examination

4. Turn the windshield wipers on and off, they will return to their original position.



5. Check the distance between the wiper blade rubber and the base of the glass, which should be 20 mm on the windshield.

Checking and adjusting the wiper arm angle

The windscreen wiper arm angle must be checked if the glass cleaning efficiency is low or if the wipers move unevenly or vibrate during operation. The special HAZET 4851-1 tool is required for adjustment.

Examination

6. Set the windshield wiper arms to their original position. To do this, wet the windshield with water. Turn on the windshield wiper briefly and stop it with the switch.

7. Remove the brush.



8. Move the lever "2". Install the special HAZET tool and secure it with the screw "3".

9. Carefully pull back the lever. The HAZET tool should be in contact with the glass at three points.

10. Check the installation angle on the instrument scale and compare with the required value.

Required value: -3°±2°.

Adjustment

11. Move the lever slightly away from the glass and turn it slightly with a 24 mm wrench "1".



12. Check the installation angle again and adjust it if necessary so that the scale shows the required value.

13. After this, remove the tool, install it again and fix it. Check the installation angle again, adjust if necessary.