Lull 944E-42 Service Manual User Manual download pdf (Page 252)

100

101

Engine: Cummins 4BT 3.9, B4.5T and QSB 4.5T

7.50

Model 644E-42/944E-42 Rev. 6/04

7.12 TROUBLESHOOTING

Trouble Possible Causes (see key, below)

Low Cranking Power

Will Not Start

Difficult Starting

Lack of Power

Misfiring

Excessive Fuel Consumption

Black Exhaust

Blue/White Exhaust

Low Oil Pressure

Knocking

Erratic Running

Vibration

High Oil Pressure

Overheating

Excessive Crankcase

Pressure

Poor Compression

Starts and Stops

1, 2, 3, 4

5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 31, 32, 33

5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 24, 29, 31, 32, 33, 61,

8, 9, 10, 11, 12, 13, 14, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 31, 32, 33, 61, 63

8, 9, 10, 12, 13, 14, 16, 18, 19, 20, 25, 26, 28, 29, 30, 32

11, 13, 14, 16, 18, 19, 20, 22, 23, 24, 25, 27, 28, 29, 31, 32, 33, 63

11, 13, 14, 16, 18, 19, 20, 22, 24, 25, 27, 28, 29, 31, 32, 33, 61, 63

4, 16, 18, 19, 20, 25, 27, 31, 33, 34, 35, 45, 56, 62

4, 36, 37, 38, 39, 40, 42, 43, 44, 58

9, 14, 16, 18, 19, 22, 26, 28, 29, 31, 33, 35, 36, 45, 46, 59

7, 8, 9, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 28, 29, 30, 33, 35, 45, 59

13, 14, 20, 23, 25, 26, 29, 30, 33, 45, 47, 48, 49

4, 38, 41

11, 13, 14, 16, 18, 19, 24, 25, 45, 50, 51, 52, 53, 54, 57

25, 31, 33, 34, 45, 55, 60

11, 19, 25, 28, 29, 31, 32, 33, 34, 46, 59

10, 11, 12

Key to Possible Causes

1. Battery charge low

2. Malfunctioning electrical

connection

3. Faulty starter motor

4. Incorrect grade of lubricating

oil

5. Low cranking speed

6. Fuel tank empty

7. Faulty stop control operation

8. Fuel inlet restricted

9. Faulty fuel lift pump

10. Clogged fuel filter

11. Restricted air cleaner

12. Air in fuel system

13. Faulty fuel injection pump

14. Faulty fuel injectors or

incorrect type

15. Incorrect use of cold start

equipment

16. Faulty cold start equipment

17. Broken fuel injection pump

drive

18. Incorrect fuel pump timing

19. Incorrect valve timing

20. Poor compression

21. Blocked fuel tank vent

22. Incorrect grade of fuel

23. Sticking throttle or restricted

movement

24. Exhaust pipe restriction

25. Leaking cylinder head gasket

26. Overheating

27. Cold running

28. Incorrect tappet adjustment

29. Sticking valves

30. Incorrect high pressure pipes

31. Worn cylinder bores

32. Pitted valves and seats

33. Broken, worn or sticking piston

ring(s)

34. Worn valve stems and guides

35. Restricted air cleaner

36. Worn or damaged bearings

37. Insufficient oil in sump

38. Inaccurate gauge

39. Oil pump worn

40. Pressure relief valve sticking

open

41. Pressure relief valve sticking

closed

42. Broken relief valve spring

43. Faulty suction pipe

44. Restricted oil filter

45. Piston seizure/pick up

46. Incorrect piston height

47. Damaged fan

48. Faulty engine mounting

49. Incorrectly aligned flywheel

housing or incorrectly aligned

flywheel

50. Faulty thermostat

51. Restriction in water jacket

52. Loose fan belt

53. Restricted radiator

54. Faulty water pump

55. Restricted breather pipe

56. Damaged valve stem oil

deflectors (If fitted)

57. Coolant level too low

58. Blocked sump strainer

59. Broken valve spring

60. Exhauster or vacuum pipe leak

61. Turbo impeller damaged or dirty

62. Turbo lubricating oil seal leak

63. Induction system leaks

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Lull 944E-42 Service Manual User Manual Page 252

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