Remove the seat.
Disengage fuel tank.
Pull fuel tank to the rear and support it at the front with a piece of wood or similar.
Caution! Avoid scratching components, for instance by inserting a piece of cloth between the fuel tank and the frame.
Remove front cover from engine.
Remove alternator fasteners (1).
Remove Poly-V belt (2).
Caution! Disconnect ground (earth) lead from battery. Insulate the ground (earth) lead.
Remove the starter motor.
Install locking device, BMW No. 11 5 640, to lock clutch housing.
Remove Poly-V belt pulley (3) with rotor gate from crankshaft.
Disconnect plug of magnetic gate.
Note: If necessary, mark position of magnetic gate for reinstallation.
Remove magnetic gate (4).
Installation is the reverse of the removal procedure.
Affix rotor (5) of Hall-effect gate with adhesive to the Poly-V belt pulley (3).
Adhesive: Loctite instant adhesive or equivalent
Caution!
- Seat retainer for Hall-effect gate rotor in groove in crankshaft (7).
- Carefully route cable for magnetic gate. Tension Poly-V belt to specification.
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.
Tightening torque:
- Preload of Poly–V belt — 8 Nm
- Alternator to alternator mount cover — 20 Nm
- Belt pulley to crankshaft — 50 Nm
Timing the ignition
Using TDC locating pin, BMW No. 11 2 650, lock the clutch housing.
Connect BMW MoDiTeC with adapter cable to Hall-effect gate plate.
Set the timing, following the tester instructions.