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 468 of 1275

TM 9-2350-311-20-1

4-3 LOCATION OF POWERPLANT COMPONENTS (ENGINE MODEL 7083-7391)

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 Coolant pump

5 Engine viscous vibration damper

6 Oil pan

7 Tachometer driveshaft

8 Speedometer driveshaft

9 Engine coolant inlet tube

10 Engine and transmission support

11 Brake apply lever — right

12 Brake apply lever — left

13 Universal joint flange adapter

14 Transmission

15 Transmission throttle valve rod

16 Transmission steer control rod

17 Transmission shift control rod

18 Secondary fuel filter

19 Alternator-to-rectifier wiring harness

20 Transmission inspection cover (brake

adjustment)

21 Surge tank-to-coolant pump hose

22 Engine oil filters

23 Primary fuel filter

24 Coolant surge tank

25 Radiator filler

26 Radiator cooling fans

27 Fuel return line quick disconnect

28 Inlet thermostat housing

29 Engine lifting eye

30 Engine coolant temperature transmitter

31 Engine exhaust outlet duct

32 Engine blower inlet housing

33 Turbocharger

34 Engine turbocharger inlet duct

35 Engine governor

36 Engine governor throttle control rod

37 Exhaust crossover tube

38 Right engine exhaust manifold

39 Glow plug controller

40 Engine oil filler cap

41 Transfer breather tube

42 Bypass thermostat housing

43 Aeration detector

44 Radiator cooling fan shroud

45 Radiator-to-surge tank hose

46 Crossover tube-to-surge tank hose

47 Surge tank pressure relief valve

48 Crossover tube

49 Radiator

4-6