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 607 of 1275

TM9-2350-311-20-1

7-1 ENGINE COOLING SYSTEM (M109A2/M109A4/M109A5) (PICTORIAL)

LEGEND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Surge tank

Connector hose (8)

Radiator

Engine coolant crossover tube-to-surge

tank hose

Engine coolant crossover tube

Engine coolant crossover tube-to-radiator

vent hose

Radiator vent-to-surge tank hose

Radiator filler cap

Inlet thermostat housing-to-radiator inlet hose

Inlet thermostat housing

Engine coolant manifold connector housing

Engine coolant manifold

Engine coolant main tube assembly

Bypass thermostat housing assembly

15

16

17

18

19

20

21

22

23

24

25

26

Engine coolant drain valve

Bypass thermostat housing assembly-to-engine

coolant main tube assembly tube

Engine coolant pump

Engine coolant pump-to-oil cooler tube

Surge tank-to-engine coolant pump tube/hose

assembly

Radiator-to-surge tank hose

Surge tank-to-pressure relief valve hose

Aeration detector

Pressure relief valve assembly

Aeration detector-to-engine coolant main

tube assembly hose

Radiator-to-aeration detector hose

Fan warning decal (4)

7-2