If necessary, disengage fuel tank and pull to the rear.
Remove cover to expose spark plug caps.
Pull off spark plug caps with special puller, BMW # 123520.
Remove spark plugs with the spark plug wrench, BMW # 123510.
Remove front cover.
Slacken alternator mounting screws and nuts (1,3,4) and install a new Poly-V belt if necessary.
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:
1. Slightly tighten hex nut (1) on adjusting screw (2) by hand (do not use tools).
2. Tighten adjusting screw (2) with a torque wrench and keep preload applied.
3. Tighten upper retaining nut (3), then remove torque wrench from adjusting screw.
4. Tighten all screws and nuts.
Tightening torque:
Poly-V belt preload — 8 Nm
Alternator to alternator support cover — 20 Nm