Remove and Replace Intercommunicating Valve Large Neoprene Washer.

TM 5-1940-321-13&P

NOTE:

When replacing a valve stud, the short threads are screwed into the valve

bottom. The use of too much thread locking compound can lock the two valve

parts together and make the valve inoperable.

( 1 ) Verify that the valve is turned to the 6 o clock position to prevent parts from

falling into the buoyancy tube.

( 2 ) Clean both the short male threads on the stud and female threads in the valve

with toluene. Use a cotton swab to clean the female threads. Threads must be

clean and free of lint.

( 3 ) Using vise grips to hold the unthreaded part of the stud, install the locknut on

the longer threads. Tighten firmly using a 10mm deep well socket and nut

driver handle.

( 4 ) Using a small screwdriver, carefully apply thread locking compound (Loctite

290 or OMC Ultralock) to the female threads at the bottom of the valve. This is

accomplished by positioning the end of the screwdriver in contact with the

threads and allowing the thread locking compound to run down the screwdriver

into the threads. Apply enough to cover all threads but no more. One to two

small drops are sufficient. Excessive amounts of threads locking compound

can prevent the valve from operating.

( 5 ) Reinstall the stud into the valve and tighten it firmly using a 10 mm nut driver.

( 6 ) Wait 2 to 3 hours, then remove the locknut and reassemble the valve as

d. Remove and Replace Intercommunicating Valve Large Neoprene Washer. This corrective

maintenance procedure is performed by direct support personnel. A large neoprene valve base washer

inside the buoyancy tube functions as an air seal between the valve and the fabric. Intercommunicating

valve base washer must be removed and replaced to correct air leaks around the buoyancy tube fabric

that cannot be corrected by tightening the intercommunicating valve base nut using the half-moon

spanner (chapter 2, paragraph 2-4a). Remove and replace the intercommunicating valve large neoprene

washer using the following procedure:

( 1 ) Deflate the main buoyancy tubes and remove the male portion of the valve as

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