Neck Dam - Kirby Morgan 77 Operation And Maintenance Manual

8.6 Neck Dam

There are two neck dams that may be used with the
helmet; a neoprene neck dam, which is standard,
and an optional latex neck dam. Instructions for
both types will be found here.
8.6.1 Removal of the Neck Dam
Tools required:
7/64 inch Allen wrench attachment on torque screw-
driver
#2 Phillips head attachment on torque screwdriver
X-ACTO knife or razor blade
®
Needle nose pliers
Small punch
1) Remove the o-ring from the groove on the outside
of the neck ring assembly.
2) Use the hex key and unscrew all the screws from
the stepped neck dam ring.
3) Separate the split neck dam rings and neck dam
from the stepped neck dam ring.
4) Discard the old neck dam.
5) Clean all parts as needed.
Split
Ring
O-ring
Pull
Strap
Screw
Blowapart drawing of neck dam assembly for the
helmet.
© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
8.6.2 Neoprene Neck Dam Replacement
Tools Required:
7/64 inch Allen wrench attachment
on torque screwdriver
#2 Phillips attachment on torque screwdriver
Small, sharp punch
KMDSI neoprene neck dams come in a
variety of sizes. Be sure to obtain the
right size neck dam for your neck. A neck
dam that is too tight will be very uncom-
fortable and can cause you to pass out.
New neck dams are supplied with no holes punched
in them for the mounting screws. As the screws are
inserted and tightened they cut their own holes in
the neck dam.
Before starting installation, note the index marks,
"notches" on the neck dam. These will line up with
the ends of the two split rings. You may find it use-
ful to use a small piece of tape to hold the split rings
in alignment.
The base of the neck
dam will be marked and
notched for alignment
with the joints on the split
Neck
dam
rings.
1) Lay the split neck dam ring on a flat level work
table with the two mating edges lined up to face each
other with a small gap (.060-.080 inch) between
them. Tape the two rings together with a small bit
of duct tape. Then flip the rings over so the tape is
on the bottom.
Stepped
2) Position the neck dam on top of the split rings
Ring
so the small opening is "up" or on top and the large
opening is "down" or on the bottom. The neck dam
will be inside out, with the seam tape that covers the
diagonal seam on the outside of the neck dam. The
base of the neck dam will be marked and notched
for alignment with the joints on the split rings.
WARNING
Kirby Morgan 77
®
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