PS Magazine - TB 43-PS-598
PS, The Preventative Maintenance Monthly
ISSUE 598
SEPTEMBER 2002
PS 598
SEP 02
22
M2 Machine Gun…
Dear Editor,
I’ve been told by several soldiers that they’re being taught in AIT to use
the .116-in end of the timing gauge to headspace the M2 machine gun.
They’ve been told at Step 9 (Page
2-46 in TM 9-1005-213-10) to
use the gauge’s .116-in end as a
measure of how much to separate the
barrel extension from the trunnion
block. Since you’re not supposed to
have a gap between the extension
and block of more than 1/16 inch,
using the timing gauge actually
results in too big a gap and the
wrong headspace.
Help me get the word out that the
timing gauge shouldn’t be used for
headspacing.
John Dixon
III Corps Troop School
Ft Hood, TX
Consider it done.
M2 gunners should
headspace and time the guns exactly
as it says in the -10.
From the desk
of the
Editor
Don’t
use
timing gauge
to measure gap
anyone who
tells you
different needs
his
headspace
checked.
A
modification work order (MWO) has been around for more than 4 years that will
keep your M40/M42 masks in better working order. Unfortunately, many NBC
NCOs don't know about the MWO and too many masks aren't being modified.
MWO 3-4240-347-20-1 (Jun 98) pre-
vents the silicone rubber of the outlet
valve housing from pulling loose from
the facepiece.
Not sure if your masks have been mod-
ified? Look at the outlet valve housing. If
a zip tie has been fastened around the
valve housing, the MWO has been done.
No zip tie? Contact your local MWO
coordinator if you have one, or your
SBCCOM logistics assistance represen-
tative. They can get you the MWO kit to
modify masks.
The zip tie is easier to install if you first pull it hand-tight before using the ten-
sioning tool to fully tighten it.
The tie should go against the face piece behind the drink tube nipple. If the tie's
anywhere else, it can't do its job.
When you put on the zip tie, remember its tab should be in the 6 to 9 o'clock posi-
tion. If you put it in anywhere in the 12 to 6 position, the drink tube gets in the way.
PS 598
SEP 02
23
M40/M42-Series Masks…
Tab should be
in 6-9 position
Zip tie should
be against face
Hey, I
don’t want
to have to
tell you
again…
check
for that
zip tie!
I need it!
the timing
gauge is
not
for head-
spacing. It’s
for timing
only.
598. 22-23 (C)
7/29/02
1:35 PM
Page 1
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