Isuzu N-Series. Manual — part 372
6A3-140 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
35. Fan Belt Adjust Plate
Install the adjust plate and temporarily tighten the
adjust plate bolt.
36. Oil Cooler Assembly
1) Apply 2 — 3 mm (0.08 — 0.12 in) bead of the
recommended liquid gasket (Three Bond
1207C) or its equivalent on the oil cooler fitting
surface.
2) Apply a coat of engine oil to the O-rings (2 piec-
es) and install the O-rings to the oil cooler.
Notice:
Take care that the O-ring does not get smeared with liq-
uid gasket.
• Install the oil cooler within 7 minutes after appli-
cation of the liquid gasket.
• For the dislocation of the liquid gasket, refer to
the illustration.
3) Tighten the oil cooler bolts and nut to the spec-
ified torque a little at a time in the sequence
shown in the illustration.
Tighten:
Oil cooler bolt and nut to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
37. Water Suction Pipe
1) Apply a 2 — 3 mm (0.12 — 0.16 in) bead of the
recommended liquid gasket (Three Bond
N6A0293E
N6A0292E
Legend
1. O-ring
2. Liquid gasket
N6A1626E
N6A0320E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-141
1207C) or its equivalent on the groove of the
water suction pipe fitting surface.
2) Install the water suction pipe to the oil cooler.
• For the dislocation of liquid gasket, refer to the
illustration.
Tighten:
Water suction pipe bolt and nuts to 24 N
⋅m (2.4 kg⋅m/17
lb
⋅ft)
Notice:
Install the water suction pipe immediately after the in-
stallation of the oil cooler.
38. Heater Pipe
1) Install the O-ring to the heater pipe.
2) Install the heater pipe to the oil cooler.
Tighten:
Heater pipe bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
39. Idle Pulley Bracket (If equipped with A/C)
Tighten:
Idle pulley bracket bolt to 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
40. Injection Pump Rubber Spacer
41. Injection Pump Assembly
Above works refer to “INJECTION PUMP ASSEM-
BLY” section in this manual.
42. Engine Foot
Tighten:
Engine foot bolt to 51 N
⋅m (5.2 kg⋅m/38 lb⋅ft)
Legend
1. Liquid gasket
N6A1627E
N6A0322E
Legend
A. 4HF1-2
N6A0290E
N6A0289E
6A3-142 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
43. 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.
44. 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 genera-
tor.
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)
45. Vacuum Pump Rubber Hose (12)
46. 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)
Drive Belt Deflection
mm (in)
8 — 12 (0.31 — 0.47) ... New belt
10 — 14 (0.39 — 0.55) ... Reuse belt
N6A0631E
N6A0344E
N6A0037E
N6A0038E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-143
47. Fuel Pipe Bracket
48. Tachometer Sensor
Tighten:
Tachometer bolt to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
49. Oil Filter Assembly
Tighten:
Oil filter bolt to 8 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
50. Oil Pipe
Tighten:
Oil pipe joint bolt to 17 N
⋅m (1.7 kg⋅m/12 lb⋅ft)
51. Engine Control Lever Assembly
Tighten:
Engine control lever bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
52. Engine Control Wire
53. Driven Plate
Use the clutch pilot aligner to install the driven
plate.
Clutch Pilot Aligner: 5-8840-2240-0
N6A0286E
N6A0743E
N6A0285E
N6A0449E
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