Face Port - Kirby Morgan 77 Operation And Maintenance Manual

Kirby Morgan 77
®

8.5 Face Port

8.5.1 General
The face port, or viewing lens, is made of a
polycarbonate plastic. Small scratches on the exte-
rior are not important, as they tend to disappear un-
derwater. However, the face port is easily replaced
by removing the port retainer and reinstalling a new
o-ring and face port.
The face port should be replaced anytime cracks are
present or anytime nicks and scratches deeper than
1/16" are present or anytime the condition is ques-
tionable.
WARNING
port and cause it to shatter upon impact
from any strong blow. If the face port
fails underwater, the helmet will flood
and drowning may result.
8.5.2 Face Port, Port Retainer, and Nose
Block Device Removal
Tools Required:
7/16 " Open-end Wrench
1/4 " Flat Blade Attachment on
Torque Screwdriver
Slip Joint Pliers and a Rag or cloth
NOTE: Wrap a rag around the nose block knob while re-
moving to prevent chrome damage when turning with pli-
ers.
1) First remove the nose block device knob then the
packing nut and slip the o-rings off the nose block
shaft.
2) Pull the nose block device out through the inte-
rior of the oral/nasal mask.
3) Next, unscrew the eleven port retainer screws and
four whisker screws with kidney plates and spacers.
Pull the retainer clear of the helmet shell.
128
Never use aerosol-
propelled sprays
near the face port
of the Kirby Morgan
77. The propellant
used in these aero-
sols can invisibly
damage the face
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Remove the screws that secure the port retainer.
whisker spacer
Don't misplace the whisker spacers.