PS Magazine - TB 43-PS-636

PS, The Preventative Maintenance Monthly

ISSUE 636

NOVEMBER 2005
PS Magazine - TB 43-PS-636 - Page 5 of 33
D
rivers, the canvas cover for your vehicle’s intake and exhaust grilles is made to
keep ice, snow and other debris out of the engine compartment when the vehicle’s
not in use.
PS 636
NOV 05
7
Personnel
Heaters…
T
he Stewart-Warner and Hupp personnel heaters have been around so long that
most combat vehicle crewmen have the start-up procedures memorized.
You can hold the RUN-OFF-START switch to START for up to two minutes for
the Stewart-Warner and no longer than four minutes for the Hupp. If the heater
won’t start in that time, you have to let it cool down or risk burning out the ignitor
or ignition control resistor.
But those start-up procedures will cause no end of trouble if you try to use ‘em
on the new A-20 heater, NSN 2540-01-396-2826.
After holding the switch on START for just 10 seconds, the heater automatically
goes into a 4-minute purge mode. The heater’s fuel supply is cut off and all remain-
ing fuel inside the heater is burned off.
Because the heater doesn’t start, most operators assume it’s defective and turn it
in for repair.
But the heater’s not the problem! It’s the improper start-up procedure that causes
all the trouble.
To start the A-20 heater correctly, hold the RUN-OFF-START switch on START
for five seconds, then flip it to RUN. The heater will go through a quick self-diag-
nosis and then start.
PS 636
NOV 05
6
M113A2/A3 FOV…
we’ve got a lot
to do today! let’s
get started!
sure, but we’d better roll
back the intake and exhaust
grille cover first!
when it comes to
start-up, I’m a whole
different animal
from the hupp or
stewart-warner!
Canvas cover keeps
out ice and snow
The cover is
not
made to help the engine
warm up faster during cold weather.
Some operators keep the grilles covered
anyway. They figure the faster the engine
warms up, the sooner the mission will be
accomplished.
Not true. In fact, the mission may not get
accomplished at all. Leaving the cover in
place heats the engine too fast and can burn
it up.
Also, fumes from the engine compartment that would normally be vented through
the exhaust grille are forced into the driver and crew compartments. That’s a dead-
ly proposition.
Always roll the cover
back from the exhaust
and intake grilles before
starting your vehicle.
Secure the cover in place
with the straps provided.
Roll
back
cover
before
starting
engine
Hold RUN-OFF-START
switch on START for
5 seconds
If the heater won’t start when
you do it the right way, check
out the troubleshooting proce-
dures in TM 9-2540-207-14&P.
If your vehicle is an M1A2
SEP or M2/M3 Bradley, refer to
your TMs for vehicle-unique
starting instructions.
636.06-07(C).qxd
9/30/05
10:17 AM
Page 1
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