1. Remove the sleeve and clamps from the valve.
2. Position the clock as shown in the figure, so that the clock’s stem rests on the tip of the valve stem.
3. Reset the clock.
4. We apply pressure to the valve.
5. Once the gauge reads the displacement specified in the tables (see the exploded view in the Garrett catalog), record the pressure and check that it falls within the required range.
6. Release the pressure and check that the gauge returns to zero.
7. If the pressure is incorrect, turn the stem and check again; repeat this process as many times as necessary until the desired pressure is achieved.

Note: When the distance is shortened, pressure increases; when it is lengthened, pressure decreases.

Operating an engine with an improperly calibrated turbocharger valve can result in a loss of power or serious engine damage.