TM-9-2320-361-20
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
OCTOBER 1991
TM-9-2320-361-20 - Page 53 of 1207
TM 9-2320-361-20
1-18. CONTROL SYSTEMS OPERATION (Contd)
b. Manifold Heater System Operation.
The manifold heater system warms air entering the intake manifold to allow engine to start in cold
weather conditions. Major components of the manifold heater system are:
MANIFOLD HEATER SWITCH
- When pressed, the circuit to the heater fuel pump is activated.
The spray nozzle valve is opened and the spark plug is energized by the ignition unit.
HEATER FUEL FILTER
- Cleans fuel before fuel enters fuel pump.
HEATER FUEL PUMP
- Supplies fuel to spray nozzle when activated.
HEATER SPRAY NOZZLE
- Distributes vaporized fuel into intake manifold.
HEATER IGNITION UNIT
- Energizes spark plug.
HEATER SPARK PLUG
- Ignites vaporized fuel distributed into intake manifold.
1-40
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