PS Magazine - TB 43-PS-566
PS, The Preventative Maintenance Monthly
ISSUE 566
JANUARY 2000
If the cleaning wand isn’t available,
shake the V-packs, making sure not to
hit them
against
anything
harder than
your hand.
Brush dirt
and dust
from the
elements
with your
hand. Then,
have the
elements
properly
cleaned by
your unit maintenance folks as soon as
possible.
While the V-packs are out, inspect
the plenum box and elements for po-
tential problems:
Eyeball the bead on the front face
of each V-pack element for dents or
sharp edges that could cut the plenum
box seal. Then check for buckling on
the rear face of the element. Either
problem means you need a new V-pack.
Look for broken welds and cracks
in the plenum air box. Dust trails along
the welds and seams of the box are
PS 566
14
JAN 00
If the chalk line is broken, the V-
pack may not be sealing correctly. So,
get your mechanic to install a new seal,
NSN 5330-01-098-6807. Remember to
wipe the chalk off the V-pack bead and
seal after testing.
This method works especially well
if you are putting new V-packs in
with-
out
replacing the plenum box seals.
But, it’s a good idea to put in new
seals along with the new V-packs when-
ever possible.
Look for dents or buckling
a good sign of a leak, so tell your
mechanic.
Look for torn, cracked or missing
plenum box seals. A missing seal makes
your tank NMC.
Those three seals also deteriorate
over time, so check each one by mea-
suring the depth of the depression made
by the V-pack bead in the seal. If the
depression measures more than
3
/
16
inch, get the plenum box seal replaced.
Here’s another way to check the
seals:
1.
Apply chalk to the raised portion of
the V-pack bead.
2.
Install the V-pack and secure the
holding clamp.
3.
Remove the V-pack and eyeball the
plenum box seal. There should be a
complete chalk line around the seal
from contact with the V-pack bead.
Missing seals allow dirt and dust to
be sucked inside the fender skirts. The
engine pulls the dirt into the air intake
system where it clogs up the V-packs.
All the seals are important, but pay
special attention to the seals at skirts
4, 5 and 6 on the left side of the ve-
hicle. These seals are closest to the air
intake grills and can let in the most
dirt.
NSNs for the seals are listed in Figs
261-264 and 266 of TM 9-2350-255-
24P-1 (Oct 92) for the M1, Figs 248-
251 and 253 of TM 9-2350-264-24P-1
(Mar 96) for the M1A1, and Figs 235-
238 and 240 of TM 9-2350-288-24P-1
(Sep 95) for the M1A2.
V-Packs
The three V-packs on all tanks not
equipped with the pulse jet system
(PJS) should be removed, cleaned and
inspected after every operation. V-
packs on PJS-equipped tanks are self-
cleaning. Removing the V-packs on
these tanks will ruin the system.
The preferred cleaning method is the
V-pack cleaning wand. You’ll find info
on the wand in the “unusual condi-
tions” section of your -10-2 TM’s op-
erating instructions.
Use wand to clean V-pack
15
aaah!
i love the
fresh air
!
◆
◆
◆
Chalk placed here.
..
...should
show up here
No wand? Shake
V-pack gently
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