Remove necked-down bolts (9).
Remove armature bearing cover (8) complete with brush-holder plate (6).
Note: Note thrust washers (2).
Remove fastener of positive contact (7), lift out brush holder and replace carbon brushes if necessary.
Remove front cover (5).
Remove armature (3) from housing (1).
Using puller, BMW No.008 400, pull the ball bearing (4) off the armature shaft.
Note: The insulation should be 0.5 mm (0.02 in) deeper than the commutator discs: if necessary, remachine with commutator saw.
Installation is the reverse of the removal procedure: pay particular attention to the following.
Use a suitable tool such as a socket or similar to press the ball bearing onto the armature shaft.
Using protective jaws, clamp the armature in a vise and slide the brush-holder plate into position, pushing the carbon brushes back for clearance.
Note: Make sure that the mark on the housing (arrow) is aligned with positive contact point (10).
Tightening torque:
- Necked-down bolts, starter housing: 5 Nm
- Positive contact to starter motor: 4 Nm