Unexplained Demand Regulator Steady Flow When Underwater - Kirby Morgan KMB-18 A/B Operation And Maintenance Manual

18) If you have disassembled the purge button
assembly, install the button (51d) and spring
(51c) into the cover (51b) and replace the retain-
ing ring (51a) using external retaining-ring pliers.
Note that the flat side of the retaining ring faces
away from the face of the button.
19) Screw the clamp (50) back together with the
cover in place (51).
20) Stretch the whisker (35) onto the exhaust
flange of the regulator.
21) Mount the regulator to the Band Mask frame
(17). Make sure the sealing O-ring (7) is in place
under the regulator mount nut (8).
22) If the Band Mask is a "B" model, do not
tighten the mount nut (8) until after the bent tube
assembly (120b) is installed on the regulator,
inlet nipple (61b), and the side block body (94b).
Tighten the mount nut (8) until the O-ring (7) is
compressed and the nut contacts the Band Mask
frame. Further tightening will damage the Band
Mask frame (17).
23) On the "A" models the regulator mount nut
(8) may be tightened before installation of the
hose assembly (119a). Use a backup wrench for
this operation.
24) Assemble the hose assembly (119a) or bent
tube assembly (119b) to the regulator (63a/b) and
the side block (93a/b).
25) Attach the screws (38), plates (37) and spac-
ers (36) on each side of the port retainer (28) and
tighten to correct torque. (see pg 89)
Do not overtighten.
Document # 010518001 © Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved.
KMB 18 & 28 MANUAL
DANGER: Always be sure to use a
torque screwdriver to check the tension
of the port retainer screws. Overtighten-
ing can cause damage to the threaded
inserts in the fiberglass frame and cause
them to loosen. Without the correct ten-
sion the port retainer may come loose
and the Band Mask could flood. This
could lead to drowning.
6.14.6 Unexplained Demand Regulator Steady
Flow When Underwater
Any leak in the face seal will cause gas to vent out
into the water. This causes the demand regulator
to steady flow, making up for the vented gas.
Even if the adjustment knob (47) is turned in, the
leak may continue.
This type of regulator flow may be caused by a
tear in the face seal, or if the face seal has
separated from the hood. It can easily be repaired
with wet suit cement. Both the hood and face seal
(2) must be completely clean and dry prior to
repairs.
page 83