Remove the generator from the engine
We discussed the removal and installation of the generator in the article - Renault Megane II generator set
To repair the generator, you will need keys for 7, 10, 27, a TORX T50 key, a tester, a puller, a hammer, screwdrivers.
Retaining the shaft from turning, unscrew the pulley fastening nut.
Remove the pulley and spacer
We mark with a marker the relative position of the covers and the stator housing
Pry off the edge of the casing with a slotted screwdriver
Remove the cover
Remove the two screws securing the brush holder
Unscrew the brush holder nut
Remove the brush holder assembly with the voltage regulator
Checking the protrusion of the brushes.
If the dimension "A" is less than 5 mm, replace the brush assembly.
We also check the ease of movement of the brushes.
Checking the resistance of the rotor winding.
The tester readings should show infinity, otherwise there is a break in the rotor winding and the rotor is replaced
Unscrew the four tie bolts
Insert a screwdriver between the covers to separate them
Remove the cover from the drive side together with the rotor
We press the rotor out of the front bearing
To replace the front rotor bearing, unscrew the four clamping plate screw
Remove the plate
Press the bearing out of the cover
We press the new bearing into the cover with a mandrel of a suitable size, applying force to the outer ring.
We press the bearing off the rotor shaft using a puller
We press the new bearing onto the rotor shaft until it stops, applying force to the inner ring of the bearing
We check the absence of a short circuit of the rotor winding to the body by connecting it in turn to each slip ring and to the rotor body
The tester should show infinity.
Assemble the generator in reverse order. We orient the covers according to the established marks.