Remove the seat.
Remove side panel.
Caution! Disconnect earth (ground) lead from battery. Insulate earth (ground) lead.
Disengage fuel tank.
Seal the fuel feed and return lines with hose clips, BMW # 133010, and disconnect.
Disconnect breather lines.
Disconnect plug for fuel pump.
Remove fuel tank.
Remove Motronic control unit.
[ABS] Remove the pressure modulator.
Remove front cover from engine.
Disconnect the leads from the alternator.
Remove alternator retainers (1, 2, 3).
Remove bolt (4) and nut (5).
Remove Poly-V belt.
Remove strut (3) from frame on left.
Remove the alternator.
Caution! Avoid scratching the components; use masking tape if necessary.
Installation is the reverse of the removal procedure.
Switch on the ignition.
Without starting the engine, fully open the throttle once or twice so that the Motronic control unit can register the throttle-valve positions.
Note:
- Disconnecting the battery deletes all entries (e.g. faults, settings) stored in the Motronic control unit's memory.
- Loss of settings can temporarily impair the operating characteristics when the engine is restarted.
Poly-V belt adjusting procedure:
Poly-V belt installation procedure:
Place the Poly-V belt in position, tension it and turn the engine over once, then relieve belt tension.
Poly-V belt tensioning procedure:
Loosen alternator retainers (1, 2, 3).
Slightly tighten hex nut (1) on adjusting screw (4) by hand (do not use tools).
Tighten adjusting screw (4) with a torque wrench and keep preload applied. Tighten upper retaining nut (3), then remove torque wrench from adjusting screw.
Tightening torque:
- Poly-V belt preload — 8 Nm
- Alternator to alternator support cover — 20 Nm
- Positive lead to alternator — 15 Nm
- Belt pulley to alternator — 50 Nm