PS Magazine - TB 43-PS-595

PS, The Preventative Maintenance Monthly

ISSUE 595

JUNE 2002

PS Magazine - TB 43-PS-595 - Page 29 of 32
PS 595
JUNE 02
55
M12A1 Decon…
T
he M12A1 decon generates lots of heat while it operates, so you have to keep it
cool while it's running and let it cool off before you shut it down. Otherwise, it can
suffer major damage, like warped pistons. So think cool.
Thinking cool begins with
"panels off, shroud on." If the
side panels are left on while
the M12A1 is running, heat
can't escape. So before start-
up, remove all five panels.
But keep the engine shroud
latched in place. It directs cool
air around the engine for effi-
cient cooling.
But the shroud won't do
much good if it doesn't fit—
and new shrouds don't fit. The
shroud wasn't designed for the
M12A1. Support can make it
fit by using the info on Page 2-
77 in TM 3-4230-209-30&P.
Remember to adjust the
engine air control handle to
the outside temperature.
Shutdown
To shut down the heater unit, put
the heater switch in the PURGE
ON position. Let the heater run for
2 minutes after combustion stops,
then turn the heater receptacle
switch on the pump to OFF.
Check the heater's water temper-
ature gauge. If the temperature is
above 100°F, continue to cycle
water through the boiler until the
temperature drops. Once it's below
100°, it's safe to shut off the heater.
Give the pump engine a chance
to cool off, too. Let the pump idle
for 10-15 minutes at 500-600 rpm.
Then shut down the pump by turn-
ing the FUEL-SHUT OFF valve
before you move the starter switch
to STOP. Otherwise, fuel collects
in the carburetor. Next time you
start the engine it could backfire
and burn somebody—or the engine
won't start at all.
Remove
panels before
starting
Shroud
latched?
Let engine
run at 500-600
rpm for 10-15
minutes
Wait till water temperature
drops below 100°F
let’s be
cool, daddio-
cool with
PM!
requital
recognition,
daddio!
your groovy pm
has, like, given me
a one-way ticket to
coolsville!
Dig?
he says
“thanks”.
oh.
595. 54-55 (C)
4/27/02
2:49 PM
Page 1


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