TM 9-2320-260-34-2
CHAPTER 17
SPECIAL PURPOSE KIT MAINTENANCE
Description and Data (page 17-1)
Section I.
Section II. Engine Coolant Heater Maintenance (page 17-3)
Section III. Personnel Heater Maintenance (page 17-36)
Section I. DESCRIPTION AND DATA
17-1. DESCRIPTION AND DATA
M809 series vehicles use engine coolant and personnel heater kits to enable the trucks to operate in
temperatures of -25F (-32C) or less. The heaters found within the kits are capable of burning a variety of
multifuels specified for M809 series trucks, and produce a heat output of 15,000 to 30,000 Btu/hr. The major
components of the heaters are the ignition system, blower assembly, heat exchanger, burner assembly, and
fuel metering valve. Additional data can be found in table 17-1, Engine Coolant and Personnel Heater Data.
Table 17-1. Engine Coolant and Personnel Heater Data.
1.
Engine Coolant Heater
Make . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Stewart-Warner
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..939J24
Heat Output (Coolant)
High Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15,000 Btu/hr
Low Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,000 Btu/hr
Fuel Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 psi (21-103 kPa) at fuel control valve inlet
Fuel Consumption
High Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.021-0.031 lb/rein (0.010-0.014 kg/rein)
Low Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.008-0.014 lb/rein (0.004-0.006 kg/rein)
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -60to 100F(-51to38C)
Overheat Thermostat Setting ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245F(118C)
Restriction Thermostat Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160F(71C)
17-1
