TM 5-4220-225-14
Table 2-2. Mission Predive Setup Procedure (Cont).
Step
Procedure
c.
Adjustable Exhaust Valve Check.
(1)
Remove the exhaust valve cover and inspect the valve body for
dirt, corrosion, and damage.
Replace if necessary.
(2)
Remove the chin button and poppet valve assembly.
(3)
Remove the diaphragm retainer and inspect the diaphragm for
cuts, nicks, and deterioration.
NOTE
Use only enough lubricant to coat the item without
excess.
(4)
Apply a light film of lubricant to the bead of the diaphragm.
(5)
Reinstall the adjustable diaphragm retainer. Ensure the
diaphragm seats properly.
NOTE
In any case of deterioration to a preformed packing,
remove and replace.
(6)
Inspect the exposed surface of the poppet preformed packing,
ensuring it to be free of cuts, nicks, and deterioration. Apply a
light film of lubricant to the exposed surface of the preformed
packing.
(7)
Insert poppet valve stem through center hole of the body.
Screw the chin button onto the stem; hand tighten.
(8)
Set the spring in place on the external end of the valve stem.
9)
Turn the valve handle fully counterclockwise and install valve
handle assembly and cover over the valve stem and spring.
Ensure the spring is in place within the handle assembly.
(10) Align the handle slot, cover screw hole and body screw hole.
Thread a cover screw in until handle is free to turn 180°
.
(11) Thread second cover screw into place and tighten both cover
screws evenly.Torque in accordance with torque limits.
2-28
