PS Magazine - TB 43-PS-744
PS, The Preventative Maintenance Monthly
ISSUE 744
NOVEMBER 2014
33
PS 744
NOV 14
V-Packs
•±
Eyeball the bead on the front face of each V-pack element
for dents or sharp edges that could cut the plenum box seal.
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.
Use tarp to
cover air intake
The
preferred
cleaning method
is the
V-pack cleaning wand.
You’ll find info
on the wand
in the
“unusual
conditions”
section of
your -10 TM’s
operating
instructions.
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.
Weigh the element
after
it’s been
cleaned. if it’s weight
exceeds
the weight shown on the air filter’s
decal or if it’s heavier than
43 pounds,
replace it.
•±
Look for broken welds and cracks in the plenum air box.
Dust trails along the welds and seams of the box are 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 measuring 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.
Chalk
placed
here…
....should
show up
here
Here’s
another
way
to check
the seals…
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-
680
7
.
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 without
replacing the
plenum box
seals.
But it’s a
good idea
to put in new
plenum box seals along with the
new V-packs whenever possible.
Just
make
sure you
remove
the tarp
before
starting
the
vehicle.
You can keep V-pack filters dry and clean by
covering the air cleaner intake with a canvas
or plastic tarp while your tank is sitting.
While the
V-packs are
out, inspect
the plenum
box and
elements for
potential
problems…
Then check for buckling
on the rear face of
the element. Either
problem means you
need a new V-pack.
The three V-packs on
all
tanks that are
not
PJS-equipped should
be removed, cleaned
and inspected after
every
operation.
V-packs
on PJS-
equipped
tanks
are
self-
cleaning.
Look±for±dents±
or±buckling
744 32-33.indd
1-2
9/23/14
3:30 PM
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