Kirby Morgan 37 & 57
7.8 Oral/Nasal
7.8.1 Oral Nasal General Information
The oral/nasal mask is used to control and maintain low carbon dioxide (CO2) levels in the helmet and to isolate the microphone for more intelligible speech.
WARNING
Never dive with a Kirby Morgan helmet without a properly functioning oral/nasal mask. Without an oral/nasal, dangerous levels of carbon dioxide may accumulate in the helmet. This can lead to uncon- sciousness and death.
Equalizing
Device
Oral/Nasal
Mask
Valve | Regulator |
Body | Mount Nut |
|
Oral/Nasal
Valve
The oral nasal mask and the parts associated with it are easy to access.
7.8.2Oral/Nasal Removal
Tools Required:
7/16 inch
The oral/nasal mask is easily replaced.
1)Remove the nose block device first. See chapter
8.
2)Remove the microphone.
3)The oral/nasal mask can then be pulled off the regulator mount nut. It is held on by a snap fit.
WARNING
The nose block device MUST be removed and reinstalled when installing a new oral nasal mask. Simply stretching the oral nasal mask over the nose block device can cause the oral nasal mask to tear. Do not use a torn oral/nasal mask. This can lead to dangerous levels of carbon dioxide in the helmet.
7.8.2 Inspection of Oral/Nasal
1)Inspect the oral/nasal mask. If it is torn, damaged or aged it must be replaced.
2)Inspect the oral/nasal valve. If it is torn or dam- aged it must be replaced.
3)Remove the valve body by pushing it out of the oral nasal.
4)Remove the old valve by pulling it out.
5)Install the new valve by feeding the thin tail through the valve body and pulling on it until the valve is seated. Cut off the excess “tail.”
6)Install the valve body in the oral nasal. The valve MUST be on the inside of the oral nasal.
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