Section 4. Helmet Disassembly
1. Before doing any disassembly inspect the general condition of the helmet. Look for signs of wear, corrosion
and/or damage.
a. Dents, deep scratches, or gouges in the helmet shell
b. Scratches, chips, or hazing in the Acrylic window.
c. Mechanical operation of the air control valve, exhaust valve, clamps and locks.
d. Dents, nicks, or gouges in the insert ring.
e. Holes in the neck dam (if installed).
f. Cuts or gouges in the insert ring O-ring.
g. Corrosion on any exposed solder joints.
h. Corrosion to nuts, bolts, and screws.
2. Disassemble the helmet keeping the parts grouped together as they are removed. During the detailed
inspection having the related parts together will aid in diagnosing problems. Some parts are best examined as
they are removed from the helmet. Sub assemblies will be individually examined after the helmet is
disassembled.
3. The disassembly sequence is as follows:
Insert Ring Assembly (with Neckdam installed):
a. Remove the assembly from the helmet.
b. Remove the O-ring from the insert ring.
c. Remove the Neckdam from the insert ring.
d. If the insert ring is fitted with a shim, remove it. On helmets where the shim has been in use for a
long time it may have adhered to the insert ring. It will be necessary to destroy the shim to
remove it. Carefully scrape the shim off of the insert ring. The insert ring can be cleaned with
Lacquer thinner and very fine steel wool to remove the residual shim material.
Window Assembly
a. Remove the six window screws from the front window. Take note of the force required to remove
them. The need for excessive force may indicate a damaged screw or significant corrosion in the
threads. Corrosion will be visually obvious on the screw threads. Check for any bent screws.
b. Remove the window and gasket from the helmet. The gasket may stick to the helmet frame, or
the window, or both. If necessary you may use a thin blade screwdriver or putty knife to release
the gasket being careful not to damage any of the parts.
Exhaust Valve Assembly (Double Exhaust):
a. Remove the two 6-32 screws closest to the helmet and pull the exhaust valve off of the base.
b. Remove the O-ring and flapper valve.
c. Remove the flapper screw and nut.
Exhaust Valve Assembly (Single Exhaust):
a. Remove the four 6-32 screws in the cover assembly.
b. Remove the flapper valve.
c. Remove the flapper screw and nut.
Clamp and Lock Assemblies:
a. Unbolt each clamp and lock assembly keeping the related parts together.
9
Summary of Contents for 61000
Page 13: ...11 ...
