Isuzu N-Series. Manual — part 367
6A3-120 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
34. Generator
Notice:
When tightening the generator, tighten in advance the
fan belt temporarily after its adjustment.
• Insert through the lower fixing bolt from the rear
side as shown in the illustration, and tighten it
with a nut on the front side.
35. Fan Belt
Check the drive belt tension.
Depress the drive belt mid-portion with a 98 N
(10 kg/22 lb) force.
Check the drive belt for cranking and other dam-
age.
Fan Belt Adjustment
Fan belt tension is adjusted by moving the generator.
Tighten:
Bolt to
• (1): 40 N
⋅m (4.1 kg⋅m/30 lb⋅ft)
• (2): 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
• (3): 46 N
⋅m (4.7 kg⋅m/34 lb⋅ft)
36. Vacuum Pump Rubber Hose (12)
37. Vacuum Pump Oil Pipe (11)
Tighten:
Vacuum pump oil pipe to
• Cylinder body side: 41 N
⋅m (4.2 kg⋅m/30 lb⋅ft)
• Generator side: 23 N
⋅m (2.3 kg⋅m/17 lb⋅ft)
38. Oil Filter Assembly
Tighten:
Oil filter bolt to 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
Drive Belt Deflection
mm (in)
8 — 12 (0.31 — 0.47) ... New belt
10 — 14 (0.39 — 0.55) ... Reuse belt
N6A0631E
N6A0037E
N6A0038E
N6A0286E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-121
39. Oil Pipe
Tighten:
Oil pipe joint bolt to 17 N
⋅m (1.7 kg⋅m/12 lb⋅ft)
40. Engine Control Lever Assembly
Tighten:
Engine control lever bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
41. Engine Control Wire
42. Driven Plate
43. Clutch Pressure Plate Assembly
Above works refer to “FLYWHEEL AND PILOT
BEARING” section in this manual.
44. Cylinder Head Gasket
Above works refer to “CYLINDER HEAD” section
in this manual.
45. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
in this manual.
46. Camshaft Bearing Lower
47. Camshaft Assembly
48. Camshaft Bearing Upper
49. Camshaft Bearing Cap
50. Valve Cap
Above works refer to “CAMSHAFT ASSEMBLY”
section in this manual.
51. Rocker Arm Shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
52. Cylinder Head Cover Gasket
Above works refer to “CYLINDER HEAD” section
in this manual.
53. Cylinder Head Cover
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
54. Nozzle Cover
55. Engine Assembly
Above works refer to “ENGINE ASSEMBLY” sec-
tion in this manual.
N6A0285E
N6A0448E
N6A0449E
6A3-122 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
CYLINDER BLOCK
Component
N6A1641E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-123
Removal
Preparation
• Disconnect battery ground cable.
• Tilt the cab
• Drain coolant and engine oil
1. Engine Assembly
Above works refer to “ENGINE ASSEMBLY” sec-
tion in this manual.
2. Nozzle Cover
3. Cylinder Head Cover
4. Cylinder Head Cover Gasket
5. Rocker Arm shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
6. Valve Cap
Caution:
Take sufficient care not to let valve caps fall into the gear
case or oil return hole.
7. Camshaft Bearing Cap
8. Camshaft Bearing Upper
9. Camshaft Assembly
10. Camshaft Bearing Lower
Above works refer to “CAMSHAFT ASSEMBLY”
section in this manual.
11. Cylinder Head Assembly
Above works refer to “CYLINDER HEAD” section
in this manual.
12. Cylinder Head Gasket
13. Clutch Pressure Plate Assembly
1) Insert the clutch pilot aligner to the clutch as-
sembly.
Clutch Pilot Aligner: 5-8840-2240-0
2) Loosen the pressure plate bolts in numerical
order a little at a time as shown in the illustra-
tion.
Legend
1. Engine assembly
34. Cover
2. Nozzle cover
35. Crankshaft pulley
3. Cylinder head cover
36. Crankshaft front oil seal
4. Cylinder head cover gasket
37. Crankshaft front slinger
5. Rocker arm shaft assembly
38. Flywheel assembly
6. Valve cap
39. Crankshaft rear oil seal
7. Camshaft bearing cap
40. Crankshaft rear slinger
8. Camshaft bearing upper
41. Spacer rubber
9. Camshaft assembly
42. Oil pan
10. Camshaft bearing lower
43. Oil pump strainer
11. Cylinder head assembly
44. Water pump pulley
12. Cylinder head gasket
45. Water pump
13. Clutch pressure plate assembly
46. Front retainer
14. Driven plate
47. Oil thermo valve
15. Engine control wire
48. Power steering pump idle gear cover
16. Engine control lever assembly
49. Power steering pump idle gear
17. Oil pipe
50. Flywheel housing
18. Oil filter assembly
51. Idle gear A
19. Tachometer sensor
52. Idle gear B
20. Fuel pipe bracket
53. Idle gear B shaft
21. Vacuum pump oil pipe
54. Oil pump assembly
22. Vacuum pump rubber hose
55. Connecting rod cap
23. Fan belt
56. Connecting rod lower bearing
24. Generator
57. Piston and connecting
25. Engine foot
58. Crankcase
26. Injection pump assembly
59. Thrust bearing lower
27. Injection pump rubber spacer
60. Crankshaft bearing lower
28. Idle pulley bracket
61. Crankshaft assembly
29. Heater pipe
62. Thrust bearing upper
30. Water suction pipe
63. Crankshaft bearing upper
31. Oil cooler assembly
64. Piston oil jet
32. Fan belt adjust plate
65. Cylinder block
33. Generator bracket
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