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VARIABLE TUMBLE SHUTTER VALVE ACTUATOR OPERATION [L8. LF, L3]

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• Normally, the spring force presses against the rod, keeping the shutter valve open. When vacuum is applied to the diaphragm chamber from the intake manifold, the rod is pulled, closing the shutter valve.

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1 | Shutter valve open
2 | Shutter valve closed
3 | Diaphragm chamber
4 | Shutter valve
5 | Rod
6 | Spring
7 | Intake manifold vacuum