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 No. 123520.
Remove spark plugs with the spark plug wrench, BMW No. 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