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(b) Measuring instruments and devices
Dial gage
Capable of measuring 0 to 10 mm (A flat head type is recommendable.)
Manometer
Mercury column or electrical type (capable of measuring 0 to 1500 mmHg)
Pressure regulating valve
Allowing gradual adjustment in a range between 0 and 2 kgf/cm
2
(0.196 Mpa)
Pressure reducing valve
Used for suppressing the air supply pressure at 5 kgf/cm
2
(0.49 Mpa) or less.
Pressure gage
Bourdon tube pressure gage (0 to 10 kgf/cm
2
(0.98 Mpa))
(c) Check method
1) Set the manometer control pressure (Pc) applied to the waste gate actuator to 0 and set the dial gage to
the zero point.
2) Gradually open the pressure regulating valve and measure the Pc value when the actuator rod is
operated by 2 mm.
3) For the hysteresis, let the rod move to 3 mm first. The gradually close the pressure regulating valve,
measure the pressure when the rod is moved to 2mm and obtain the difference from the pressure
measured in b. above.
4) Precautions
Set the dial gage on the extension line of the actuator rod.
The piping and joints shall completely be free from leak.
Fix the turbocharger and dial gage securely.
If an electric manometer is used, it shall have sufficient precision.
Even when an electric manometer is used, use of a mercury column type manometer in combination is
recommended for calibration and daily check.
The speed for increasing/decreasing Pc by means of the pressure regulating valve shall be very slow
near the measuring point. If the mm position is exceeded, restart from the beginning.
Do not apply over 0.49 MPa (5 kgf/cm
2
) to the actuator.
(46) Waste gate actuator leak test
Apply 0.12 Mpa (1.2kgf/cm
2
) to the actuator and hold the state for minute. The actuator is good if the
pressure then is 0.11 Mpa (1.1kgf/cm
2
) or above.
