Waste Gate Actuator

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This is the wastegate actuator...

Turbo and wastegate mechanism

It bolts to the turbo housing via three bolts (position indicated by the green arrows). The capsule (yellow arrow) converts pressure/vacuum to linear motion in the actuator rod (red arrow) to turn the wastegate shaft (purple arrow) thereby controlling the amount of exhaust gasses by-passing the turbo and ultimately controlling the level of boost.

Turbo and wastegate mechanism

The wastegate often sticks and needs releasing.