Engine bay components including expansion clip, crankshaft belt pulley cover, center bolt, and spark plug locations on Smart 450/451/452/454.

Three black and white photos showing engine components with numbered callouts identifying pulley, belt, and spark plugs.

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See all Powertrain figures for the Fortwo (450), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.