TM-9-2320-260-20
TRUCK, 5-TON, 6X6, M809 SERIES (DIESEL)
TECHNICAL MANUAL; UNIT MAINTENANCE
APRIL 1995
TM-9-2320-260-20 - Page 67 of 1337
TM 9-2320-260-20
1-19. POWER SYSTEMS OPERATION (Contd)
g. Cooling System Operation.
A
B
C
D
E
F
G
H
I
J
K
L
M
N
SURGE TANK
- Filling point for cooling system.
WATER MANIFOLD -
Collects coolant from cylinder heads and directs it to thermostat housing
where it is redirected through system.
WATER TEMPERATURE SENDING UNIT -
Sends signal indicating engine coolant
temperature to gage on instrument panel.
SURGE TANK-TO-WATER MANIFOLD VENT HOSE
- Vents air trapped in water manifold.
THERMOSTAT
- Shuts off coolant flow to radiator until engine temperature reaches 175°F
(79°C). Coolant is then directed to radiator.
SURGE TANK-TO-RADIATOR VENT HOSE
- Vents air from cooling system.
RADIATOR INLET TUBE
- Directs coolant from water manifold to radiator after thermostat
has opened.
RADIATOR FAN SHROUD
- Permits a greater concentration of air to be drawn through
radiator.
RADIATOR DRAIN VALVE
- Permits coolant drainage from radiator.
RADIATOR
- Directs coolant through a series of fins or baffles so air can remove excessive heat
from coolant.
ENGINE OIL COOLER
- Removes excessive heat from engine oil.
RADIATOR OUTLET TUBE
- Directs coolant from radiator to engine oil cooler.
BYPASS TUBE
- Directs coolant back to engine oil cooler where it is then recirculated through
engine until thermostat opens.
SURGE TANK-TO-ENGINE OIL COOLER HOSE
- Directs coolant to engine oil cooler when
filling the system.
1-54
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