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KMB 18 & 28 MANUAL
page 77
Document # 010518001 © Copyright 1970-2003 Kirby Morgan Dive Systems, Inc. All rights reserved.
Fig. 6.57 Note the difference between the exhaust covers for
the KMB 18 and 28. The cover for the 18 is on the left, while
the 28 is on the right.
28
18
DANGER: Always use a torque
screwdriver to check the tension of the
port retainer screws. Overtightening can
cause damage to the threaded inserts in
the frame and cause them to loosen. With-
out the correct tension the port retainer
may come loose and the Band Mask could
flood. This could lead to drowning.
6. 13 MAIN EXHAUST ASSEMBLY (64-67,
69)
The main exhaust assembly (64-67) is held in
place by the three screws (69) that are installed
from the inside of the mask frame. Silicone
sealant (RTV) is used to seal the main exhaust
body (67) to the mask frame (17) on the KMB 18.
On the KMB 28 there is no main exhaust body.
The seat for the rubber exhaust valve is molded
into the mask frame.
6.13.1 Exhaust Valve (66) Removal
Tools Required:
Flat blade screwdriver
1) The cover (65) is removed by unscrewing the
two screws (64). If the cover is badly dented so
that it interferes with the performance of the
exhaust valve (66) it must be replaced.
2) The valve (66) must be replaced at the slightest
sign of deterioration or aging of the rubber. Sim-
ply grasp the valve and pull to remove.
3) Replace the exhaust valve (66) by feeding the
tail of the new valve into the hole in the center of
the body and pulling it throught until the stem
seats. The excess tail may be trimmed off.
3) The main exhaust body (67) on the KMB 18
should never need servicing, unless the seal is
broken between the silicone sealant (RTV) and
the body (67) and mask frame (17). On the KMB
28 the main exhaust body is molded into the mask
frame.
CAUTION: Over tightening the ex-
haust cover screws on the KMB 28 could
damage the threads in the exhaust body.
This body is not replaceable and could
require the replacement of the entire mask
frame.
Fig. 6.56 Note how the main exhaust body is molded into the
frame on the KMB 28.
Fig. 6.55 The main exhaust valve exposed on the KMB 18.