Face Port And Nose Block Replacement - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

Fig. 6.5 Don't lose the whisker spacers.
6.3.3 Face Port (27) and Nose Block Device (3)
Replacement
1) Clean the O-ring groove that is in the Band
Mask frame (17).
Fig. 6.6 Clean the O-ring groove.
2) Lightly coat the port O-ring (26) with silicone
lubricant and replace in the Band Mask frame
(17).
WARNING: The O-ring in the face
port of the Kirby Morgan Band Mask 18A/
B and 28 is made from a special com-
pound and has unique dimensions. It is a
softer durometer O-ring than is commonly
available. There are no equivalent O-rings
manufactured by other vendors. This O-
ring must be replaced with a KMDSI O-
ring. Failure to do so could lead to seal
failure.
Document # 010518001 © Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved.
KMB 18 & 28 MANUAL
Fig. 6.7 Install the port O-ring .
3) Place the new face port (27) into the Band
Mask frame (17) making sure the O-ring (26) is in
its proper place.
4) Clean and lubricate the O-ring (31) located on
the back side of the port retainer (28).
5) Slip the O-ring (31) on the small tube that
protrudes from the rear of the port retainer (28).
Place the entire port retainer (28) onto the Band
Mask frame (17), holding it in place against the
port (27) and O-ring (26) while the screws (29,
38) are all run in loose.
6) Slightly tighten each screw (29,38), one after
another, until they are all snug (12 inch pounds
(13 kg cm) of torque) and the O-ring (26) has
completely sealed the face port (27).
DANGER: Always use a torque
screwdriver to check the tension of the
port retainer screws. Overtightening can
damage the threaded inserts in the fiber-
glass or plastic frame and cause them to
loosen. Without the correct tension the
port retainer may come loose and the
Band Mask could flood. This could lead
to drowning. If the inserts do become
loose, the mask must be returned to
KMDSI for repair.
WARNING: Damage to the inserts
on a KMB 28 cannot be repaired and
requires the replacement of the mask
frame.
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