8. TURBOCHARGER (b) Measuring instruments and devices (c) Check method 1) Set the manometer control pressure Pc applied to the waste gate actuator to 0 and set the dial gauge 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 gauge on the extension line of the actuator rod. The piping and joints shall completely be free from leak.
Fix the turbocharger and dial gauge 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 kg/cm 2 } to the actuator. (2) Waste gate actuator leak test Apply 0.12 MPa {1.2 kg/cm 2 } to the actuator and hold the state for minute. The actuator is good if the pres- sure then is 0.11 MPa {1.1 kg/cm 2 } or above.
82E-5 – 98E-5 SERIES 8-9 Dial gauge 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 – 0.196 MPa {0 – 2 kg/cm2} Pressure reducing valve Used for suppressing the air supply pressure at 0.49 MPa {5 kg/cm2} or less. Pressure gauge Bourdon tube pressure gauge (0 – 0.98 MPa {0 – 10 kg/cm2})