TM 9-2320-273-20
Section XXVIII WINTERIZATION KIT
2-81. INTRODUCTION.
The Winterization Kit is an available option on all M915 thru M920 vehicles. This kit facilitates
vehicle start-up at temperatures down to -50°F (-46°C.). The components of this kit are described
below.
2-82. WINTERIZATION KIT.
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110 VAC POWER CORD. This twenty-five foot power cord is used to connect a suitable
110/115 V exterior power supply to the power receptacle mounted on top of the vehicle
circuit breaker box.
CIRCUIT BREAKER BOX. Mounted to the vehicle right side behind the front fender and
in front of the battery box, this control center channels incoming 110 VAC electrical
power to any of four separate heaters. Each of the heaters is controlled and protected by
an individual circuit breaker.
TRANSMISSION OIL HEATER. Located on the forward, lower, left side of the trans-
mission, this immersion heater supplies 375 watts. No thermostat is used due to the
relatively low wattage. When the 110 VAC power cord is plugged in, this heater can be
operated by the circuit breaker so marked. The breaker is a 15 ampere.
ENGINE OIL HEATER. Also an immersion type heater, the unit is mounted thru the
aft, lower, left side of the engine oil pan with a capacity of 750 watts, which is controlled
by a thermostat set at 170°F. The thermostat mounts to a plate outside the oil pan and
is protected by an insulated waterproof cover. When the 110 VAC power cord is plugged
in, this heater can be operated by the circuit breaker so marked. The breaker is a 15
ampere.
ENGINE COOLANT HEATER. This thermo-syplon type requires no circulating pump
and has a capacity of 2700 to 2800 watts. The heating unit integral with a thermostat
set at 190° F, is mounted to the main right hand frame rail below the turbocharger. The
heated coolant is piped to the top of the engine into the rear water manifold. The hot
coolant flows down thru the engine as the cold coolant returns to the heater. When the
110 VAC power cord is plugged in, this heater can be operated by the circuit breaker so
marked. The breaker is a 30 ampere.
BATTERY BOX HEATER. The battery box is insulated and heated by a coil, under the
battery support, with a capacity of 550 watts. A thermostat mounted on the inside back
wall of the box closes at +35°F and opens at +55°F. When the 110 VAC power cord is
plugged in, this heater can be operated by the circuit breaker so marked. The breaker is
a 15 ampere.
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