Reinstallation Of The Bent Tube Assembly - Kirby Morgan 77 Operation And Maintenance Manual

Kirby Morgan 77
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if any erosion is present or integrity is in question.
Keep in mind the bent tube is a critical component
that routes breathing gas to the regulator system.
7.7.4 Reinstallation of the Bent Tube
Assembly
Tools Required:
11/16 inch Open-end Torque Wrench Attachment
Torque wrench
2 ea. 13/16 inch regulator adjustment wrenches
Normal minimum replacement parts during overhaul:
o-ring, Teflon ring
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If a new bent tube is being installed or the side block
has been removed, refer to the section on sideblock
replacement for installation instructions.
1) Lightly lubricate the bent tube o-ring and install
in the o-ring groove at the regulator end of the bent
tube, then install new Teflon
end with the new ones supplied.
2) Push the o-ring end of the bent tube assembly into
the regulator nipple tube. Slide it in until the side block
end is aligned with the threads for the mount nut.
3) Be sure the new Teflon
side block end of the bent tube then engage the threads
to the side block and hand tighten.
4) Start the "regulator to bent tube" mount nut onto the
nipple tube of the demand regulator and run it up by
hand as far as it will go. Use a wrench on the nipple
tube hex, if necessary, to prevent the nipple tube from
threading inward. If the nipple tube threads inward
Always use a torque wrench to tighten the
fittings on the bent tube assembly.
94
o-ring at the side block
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o-ring is in place on the
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© ⅯⅯⅩIⅡ Kirby Morgan Dive Systems, Inc. All rights reserved. Document # 130318003
Tighten the bent tube to the proper torque value.
this can damage the sealing surface of the inlet valve.
NOTE: Run the mount nut up on the inlet nipple hand
tight only.
5) Using a torque wrench, tighten the bent tube as-
sembly nut onto the side block to (100 inch lbs).
6) Hold the hex on the nipple tube with a wrench and
tighten the jam nut against it with a torque wrench to
40 inch pounds.
CAUTION
The bent tube assembly for the KM77 is a
unique design and is not interchangeable
with the bent tube assembly used on other
Kirby Morgan masks and helmets.