TM 5-4220-226-14&P
4-21. Exhaust Valve Assembly Maintenance.
This task covers:
a.
Removal
b.
Cleaning
c.
Installation
INITIAL SETUP
Tools
Materials Required (continued)
Tool Kit, General Mechanic's (item 4, appx B)
Nonionic Detergent (NID Solution) (item 3, appx E)
Warm Fresh Water (item 4, appx E)
Materials Required
Lacquer Thinner (item 5, appx E)
Silicone Sealant (item 9, appx E)
Soft Bristle Brush (item 1, appx E)
Exhaust Valve
Clean, Lint-Free Cloths (item 2, appx E)
a. Removal
(1) Place helmet on clean workbench.
(2) Remove screws (1) from valve cover (2). Remove valve cover.
(3) Remove exhaust valve (3) by grasping the rubber valve and pulling. Discard valve.
(4) The valve body may be removed from the helmet by removing three screws (4) from the inside of
the helmet and removing the valve body (5).
4-27
