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 464 of 1275

TM 9-2350-311-20-1

4-1 LOCATION OF POWERPLANT COMPONENTS (ENGINE MODEL 7083-7396)

NOTE

Location of surge tank pressure relief valve differs in M109A2/M109A3 and M109A4/

M109A5 Howitzers (para 7-5).

LEGEND

1 Transmission lifting eye

2 Engine oil filter-to-oil cooler hose

3 Engine oil cooler-to-filter hose

4 Flame heater igniter

5 Coolant pump

6 Engine viscous vibration damper

7 Oil pan

8 Tachometer driveshaft

9 Speedometer driveshaft

10 Engine coolant inlet tube

11 Engine and transmission support

12 Brake apply lever — right

13 Brake apply lever — left

14 Universal joint flange adapter

15 Transmission

16 Transmission throttle valve rod

17 Transmission steer control rod

18 Transmission shift control rod

19 Secondary fuel filter

20 Alternator-to-rectifier wiring harness

21 Transmission inspection cover (brake

adjustment)

22 Surge tank-to-coolant pump hose

23 Engine oil filters

24 Primary fuel filter

25 Coolant surge tank

26 Radiator filler

27 Radiator cooling fans

28 Fuel return line quick disconnect

29 Inlet thermostat housing

30 Engine lifting eye

31 Engine coolant temperature transmitter

32 Engine exhaust outlet duct

33 Engine blower inlet housing

34 Turbocharger

35 Engine turbocharger inlet duct

36 Engine governor

37 Engine governor throttle control rod

38 Exhaust crossover tube

39 Air box heater fuel pump solenoid valve

40 Air box heater motor and pump assembly

41 Right engine exhaust manifold

42 Engine oil filler cap

43 Transfer breather tube

44 Bypass thermostat housing

45 Aeration detector

46 Radiator cooling fan shroud

47 Radiator-to-surge tank hose

48 Crossover tube-to-surge tank hose

49 Surge tank pressure relief valve

50 Crossover tube

51 Radiator

4-2