Isuzu N-Series. Service manual — part 370
6A3-132 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Caution:
Do not apply engine oil to the bearing back faces and
the crankcase bearing fitting surfaces.
2) Locate the position mark applied at disassem-
bly if the removed lower bearings are to be re-
used.
7. Thrust Bearing Lower
Install the thrust bearing lower to the rear side of
the crankcase No.5 journal.
Caution:
The thrust bearing oil grooves must be facing the sliding
faces.
8. Crankcase
1) Apply a 3 mm (0.12 in) bead of recommended
liquid gasket (Three Bond 1207C) or its equiv-
alent to the crankcase upper surface as shown
in the illustration.
2) Carefully place the crankcase on the cylinder
body.
• Install the crankcase within 20 minutes after
application of liquid gasket.
N6A0650E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-133
3) Tighten the crankcase to the specified torque in
the numerical order shown in the illustration.
Tighten:
Crankcase bolt (M14: (1) — (10)) to
• 1st step: 98 N
⋅m (10 kg⋅m/72 lb⋅ft)
• 2nd step: 132 N
⋅m (13.5 kg⋅m/98 lb⋅ft)
• 3rd step: 30 — 60
°
Crankcase bolt (M10: (1) — (17)) to 37 N
⋅m (3.8 kg⋅m/
27 lb
⋅ft)
Angle gauge: 5-8840-0266-0
Legend
1. Liquid gasket
N6A1622E
N6A1415E
6A3-134 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
9. Piston and Connecting Rod Assembly
10. Connecting Rod Bearing
11. Connecting Rod Cap
Above works refer to “PISTON AND CONNECT-
ING ROD” section in this manual.
12. Oil Pump Assembly
Above works refer to “OIL PUMP ASSEMBLY”
section in this manual.
13. Idle Gear B Shaft
Tighten:
Idle gear B shaft bolt to 31 N
⋅m (3.2 kg⋅m/23 lb⋅ft)
Apply the engine oil to the idle gear shaft after in-
stallation.
14. Idle Gear B
The face of the idle gear B with longer boss should
be positioned toward the rear side shown in the il-
lustration
Tighten:
Idle gear B bolt to 110 N
⋅m (11.2 kg⋅m/81 lb⋅ft)
15. Idle Gear A
1) Turn the crankshaft clockwise so that the en-
gagement mark of the crankshaft gear faces to
the shaft center of the idle gear A and the No.1
cylinder piston comes to the top dead center.
2) Align the crankshaft gear with the engagement
mark of the idle gear and install the idle gear A.
Tighten:
Idle gear A bolt to 133 N
⋅m (13.6 kg⋅m/98 lb⋅ft)
N6A0208E
N6A0438E
N6A0439E
N6A0440E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-135
16. Flywheel Housing
1) Carefully wipe any foreign material from the cyl-
inder body rear face.
2) Apply the recommended liquid gasket (Three
Bond 1207C) or its equivalent to the shaded ar-
eas shown in the illustration.
3) Align the cylinder body knock pins with the fly-
wheel housing knock pin holes.
4) Tighten the flywheel housing bolts to the spec-
ified torque shown in the illustration.
Tighten:
Flywheel housing bolt to
• (A): 96 N
⋅m (9.8 kg⋅m/71 lb⋅ft)
• (B): 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
• (C): 94 N
⋅m (9.6 kg⋅m/69 lb⋅ft)
• (D): 25 N
⋅m (2.6 kg⋅m/19 lb⋅ft)
• (E): 76 N
⋅m (7.7 kg⋅m/56 lb⋅ft)
• (F): 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
• Tighten the bolts marked with “E” or “B” from
the injection pump side, and those with “F” from
the cylinder body side.
Tighten:
Flywheel housing bolt (G) to 96 N
⋅m (9.8 kg⋅m/71 lb⋅ft)
17. Power Steering Pump Idle Gear
1) Apply the engine oil to the idle gear shaft.
2) Install the idle gear shaft (1) with the idle gear
(2) to the cylinder body A portion as shown in
the illustration.
Tighten:
Idle gear shaft bolt to 133 N
⋅m (13.6 kg⋅m/98 lb⋅ft)
N6A0711E
N6A0180E
N6A0181E
N6A0182E
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