TM 5-1940-321-13&P
( 4 ) Remove the keel valve base through the incision.
( 5 ) Install a new keel valve base through the incision. Use a new large neoprene valve
base gasket. Verify that the neoprene gasket is pressed firmly down on the valve
base.
( 6 ) Install the grooved metal valve base gasket and valve base nut. Tighten the valve
base nut firmly but not excessively using the collar nut spanner.
( 7 ) Following the procedures in Appendix F, apply an inner patch to the incision. Use
strongan fabric and polyurethane glue.
( 8 ) Apply an outer patch over the incision using strongan fabric and polyurethane glue
and allow the glue to cute for a minimum of 12 hours.
( 9 ) Install the metal valve insert and inflate the keel to 220 mbar (3.2 psi). Install the
metal valve cap.
( 10 ) Using the collar nut spanner, tighten the keel valve base nut firmly, but not
excessively. Do not tighten to the extent that the valve base turns inside the keel.
( 11 ) Perform the air leak test (chapter 6, paragraph 6-3) on the patch and the valve. If
no leaks appear, the repair is complete. If leaks appear around the valve, proceed
to the next step.
( 12 ) Remove the metal valve insert to deflate the keel.
( 13 ) Using a collar nut spanner, loosen and remove the valve base nut. Exercise care to
avoid dropping the valve base into the keel.
( 14 ) Install an additional large neoprene valve base gasket between the grooved valve
base metal compression washer and the keel fabric.
( 15 ) Install the base nut. Tighten the base nut firmly but not excessively. Install the
metal valve insert and inflate the keel to 220 mbar (3.2 psi).
( 16 ) Using a collar nut spanner, tighten the valve base nut firmly but not to the extent
that the valve base rotates inside the keel.
( 17 ) Perform a leak test (chapter 6, paragraph 6-3).
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