Replacement / check of generator brushes / voltage regulator (BMW 5 Series E39)

Removal the BOSCH generator

Remove the poly V-belt "1" and generator "2".

Unscrew 3 screws "6" securing the protective cover "5" of the generator.

Unscrew the 2 screws "4" securing the relay-regulator "3" from the back of the generator and carefully remove it.



If the length of brushes "2" is 5 mm or less, replace the brushes. To do this, unsolder the cores of the connecting wires.

Check the contact rings for wear, and if necessary, finely grind and polish.

Clean the contact surfaces, check the tension of the contact springs, replace the springs if necessary.

Installation

Insert brushes "A" and springs "B" into brush holder "C" and solder the connecting wires.



To prevent the solder from rising up the soldered wire when soldering a new brush, it must be grasped with tweezers.

Caution: As the solder spreads along the wire, it becomes hard, causing the brush to become unusable.

The insulating sleeve of the core must be secured in a row, with the place of the like having an eye.

After installing new brushes, check that they move easily in the brush holder.

First, tighten the voltage regulator by hand with one screw, then carefully press it into the final position and tighten both screws.

Screw on the protective cover of the rear part of the generator.

Install the generator.

Removal the VALEO generator

Remove the generator.

Remove 3 screws securing the generator cover protection.

Unscrew the 2 screws and nut securing the relay-regulator and carefully remove it.

Installation

New relay-regulator with mounting1 cover to install and easily screw on

Remove the mounting cover by moving it upwards.

Install the supplied cover. Tighten the M4 mounting bolt to 2 Nm, and the M5 screws to 4 Nm.

Install and screw on the protective cover.

Install the generator.

You can read the original on the website: bmwman.ru