PS Magazine - TB 43-PS-708

PS, The Preventative Maintenance Monthly

ISSUE 708

NOVEMBER 2011
PS Magazine - TB 43-PS-708 - Page 9 of 33
15
PS 708
NOV 11
E
ver tried to start your HMMWV in cold weather
and it wouldn’t crank? Then you couldn’t get warm
or
perform your mission!
Your HMMWV gets cold whenever the temp-
erature drops to around 35°F. But it should still start
within a couple of tries. If it doesn’t, check the glow
plugs. That’s right, the glow plugs.
Unfortunately, whenever one glow plug fails,
the others do, too, and quickly! And that will keep
your HMMWV from moving. So when you take your
HMMWV in for servicing, have the mechanics also
check the glow plugs. It shouldn’t take more than
10 minutes and it’ll prevent wasted time later.
A good immersion heater for the job can be ordered using CAGE code 38453 and
PN 97-803-100 U. You can email
contact@activegearco.com
for more info on it.
If you already have an M67 liquid immersion heater, NSN 4540-00-469-6593, use it.
TM 9-4540-202-12&P tells you how.
Follow the instructions on Pages 2-18 through 2-20 of TM 9-2330-267-14&P (Jul 91)
to adjust the M67 heater bracket to make it fit the tank. You’ll get general guidance
there on operating your M149 water trailer in extreme cold, too.
•
Place the water trailer in a shelter,
especially if the temperature is below
0°F. A warm tent where there’s a field
range operating is best. If a shelter’s
not available, cover the trailer with
canvas and keep warm air circulating
with a heater.
•
Always keep the manhole and filler
covers tightened. That helps maintain
water temperature in the tank and
keeps freezing cold air out!
•
After each use, drain the pipes by
shutting off the water with the main
T-valve in front of the tank. Then open
all faucets. Prop them open with
a piece of wood. No water means no
freezing.
•
Use an immersion heater only in metal
tanks. Never use one in a fiberglass
tank. It could melt the fiberglass.
If You
Can’t Go,
Check the
Glow!
HMMWV…
Prevent
Pipe
and
Faucet
Freezing
If You
Can’t Go,
Check the
Glow!
Shut off water with T-valve
Keep manhole cover tightened
Replace bad glow plugs with
why can’t I
get any water
out of you?
even in a
cold climate,
it’s important
to
stay
hydrated.
But
that’s hard
to do if your
water is
frozen!
So here are
some
cold
weather PM
tips
to help
you prevent
pipes and
faucets from
freezing
on your
M149 water
trailers.
this
is what
happens when
you
neglect
cold
weather
pm.
I
can’t
get
you started,
what should
I do?
get
some-
body to
check
my
glow
plugs!
I’m so
thirsty!
M149-Series
Water
Trailers…
708 14-15.indd
1-2
10/5/11
10:17 AM
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