132 5977B Series MSD Troubleshooting and Maintenance Manual
4 General Maintenance
To Install the EI Calibration and Vent Valve Assembly
Materials needed
• Calibration valve
• Diffusion (G7077-60211)
• Turbo (G7077-60204)
• O-ring for calibration valve (0905-1217)
• PFTBA (05971-60571) or other tuning compound
• Screwdriver, Torx T-20 (8710-1615)
Procedure
1 Remove the old valve assembly. (See “To Remove the EI Calibration and
Vent Valve Assembly” on page 131 and Figure 18 on page 128.)
2 Ensure the valve O-ring is in place. If it is worn or damaged, replace it.
3 Install the calibration and vent valve assembly, and tighten the screws that
hold it in place.
4 Reconnect the calibration valve cable to the connector next to the fan.
5 Remove the vial from the new calibration valve. (See “To Refill the EI
Calibration Vial” on page 128.) The valve is supplied with a vial already
installed.
6 Fill and reinstall the calibration vial.
7 Pump down the MSD.
Failure to purge the calibration valve will damage the filaments and detector.
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