TM 5-1940-321-13&P
NOTE:
A stuck valve that remains stuck can sometimes be removed by allowing the
penetrating lubricant to work on the corrosion for 24 hours, and then repeating
the above procedure. Careful use of a hot air gun to heat the valve may also be
effective.
( 8 ) If the stuck male portion cannot be removed after several attempts, the valve
must be removed and replaced as described in paragraph 7-18e. Removing
and replacing the entire intercommunicating valve is a complex procedure.
Additional attempts should be made to free the stuck valve before replacement.
b. Regrind the Mating Surfaces of the Intercommunicating Valve. This corrective maintenance
procedure is performed by direct support personnel. The valve surfaces must be reground when grooves
are worn in either surface. The grooves are caused by operating the valve flywheel with sand or grit
between the mating brass surfaces. The soft brass is easily scratched and distorted. The grooves allow
air to leak past the valve faces.
Use caution when working with toluene. Toluene is a flammable and
poisonous solvent. Do not use near sparks or flame. Use outdoors or
provide adequate ventilation. Use in a confined space can cause loss of
consciousness and in extreme concentrations, death. Wipe up all spills
immediately. Remove toluene soaked towels from the work area to reduce
the concentration of toluene in the air and prevent fire. Minimize contact of
toluene with the skin. Never leave toluene soaked towels on boat fabric.
NOTE:
The brass male and female portions of the intercommunicating valve are ground
together when the valve is manufactured. The parts are not interchangeable from
one intercommunicating valve to another. If the valve is damaged to the extent
that it cannot be reground, then the entire valve must be replaced as described in
Valves must also be reground when the mating surfaces are pitted from
corrosion. Use the following procedure to regrind the intercommunicating valve.
( 1 ) Clean the male portion of the valve in toluene to remove all dirt and grease.
( 2 ) Clean the female portion of the valve which remains in the buoyancy tube
by wiping with a shop towel dampened in toluene. Remove all grease.
7-16
