PS Magazine - TB 43-PS-609
PS, The Preventative Maintenance Monthly
ISSUE 609
AUGUST 2003
PS 609
AUG 03
49
M40/M42-Series Mask…
How Do I Order Headharness?
PS 609
AUG 03
48
NBC
NCOs, you no longer have to send your ACADAs off to support when the tip
of the exhaust valve breaks. You can take care of broken tips yourself.
The replacement procedure was added in Change 2 to Page 4-37.0 TM 3-6665-
321-12&P. If you don't have Change 2, here's how to replace the exhaust valve tip:
1.
Unscrew the exhaust
port tip counterclock-
wise with a 5/16-in
open-end wrench if
enough of the six-sided
flat portion of the tip is
undamaged. If there's a
lot of damage, put a flat
blade screwdriver in the
remaining part of the tip
and unscrew it counter-
clockwise.
2.
Check the exhaust
port cavity for any
remaining pieces of the
tip. Remove them.
3.
Make sure the O-ring
is still in place within
the cavity. If the O-ring
has come out, put it back
in the cavity.
4.
Put the new tip, NSN 4730-01-
494-7215, on the metal part of the
exhaust port and hand-tighten it
clockwise. Tighten it carefully so
that you don't damage the six-
sided flat portion of the tip.
5.
Tighten the tip with a 5/16-in
open-end wrench.
You cannot replace the tip for
the inlet valve. If its tip breaks,
you must replace the whole valve
using the procedure in Para 3.4.1.
Unscrew tip
with wrench
Look in cavity for tip pieces
Put O-ring back in cavity
Put on
new tip
looks like
your exhaust
valve tip is
crunched.
guess this
means a
long trip
for you to
support.
I don’t
need to
go to ds.
you
can
replace
my valve
tip!
hey,
let’s
get on the
ball here.
I need a
new head-
harness!
that’s funny.
the headharness
nsn isn’t in the
tm… what’s up
with that?
ACADA Chemical Alarm…
Dear Half-Mast,
How do we order the head-
harness for the M40A1 and
M42A2 masks? There is no
NSN listed for the headharness
on Pages I-2 and I-3 in TM 3-
4240-346-20&P.
SFC R.P.
Dear Sergeant R.P.,
When the TM was printed, the
headharness NSN wasn't available.
NSN 4240-01-464-7839 will be added
in the next revision to the TM.
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