Checking basic camshaft position on 454.0 engine 639.939 with intake/exhaust gear wheels and timing marks.

Engine camshaft timing diagram with callouts A-D showing gear wheels and timing case cover markings.

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See all Powertrain figures for the Fortwo / Forfour (453), 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.