TM-9-2350-311-20-1
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS
AUGUST 1994
TM-9-2350-311-20-1 - Page 609 of 1275
TM9-2350-311-20-1
7-2 ENGINE COOLING SYSTEM (M109A3) (PICTORIAL)
LEGEND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Surge tank drain cock
Surge tank-to-pressure relief valve hose
Radiator-to-surge tank hose
Surge tank
Engine coolant manifold connector housing
Engine coolant manifold connector housing-to-
engine coolant crossover tube hose
Radiator
Radiator fan
Surge tank pressure relief valve with block,
gasket, and adapter (earlier version)
Engine coolant crossover tube
Engine coolant manifold connector housing-to-
engine coolant crossover tube hose
Radiator filler cap
Inlet thermostat housing-to-radiator inlet hose
Inlet thermostat housing
Engine coolant manifold connector housing
Engine coolant manifold
Engine coolant crossover tube-to-radiator
vent hose
Crossover tube-to-surge tank hose
Radiator outlet-to-engine coolant lower tube hose
Engine coolant lower tube
Engine coolant lower tube-to-engine coolant
main tube hose
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
Engine coolant drain valve
Engine coolant main tube
Engine coolant pump
Engine coolant pump-to-oil cooler tube
Engine coolant pump connector hose
Surge tank tube-to-engine coolant main tube
inlet hose
Surge tank tube
Surge tank hose
Bypass thermostat lower housing-to-engine
coolant main tube inlet hose
Bypass thermostat lower housing
Bypass thermostat upper housing
Engine coolant manifold connector housing-to-
bypass thermostat housing hose
Bypass thermostat housing-to-surge tank hose
Engine coolant lower tube
Radiator outlet-to-engine coolant lower tube
Aeration detector-to-engine coolant lower tube
Aeration detector
Radiator-to-aeration detector hose
Surge tank-to-radiator hose
Surge tank pressure relief valve (later version)
7-4
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