Isuzu N-Series. Manual — part 351
6A3-56 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
• Use the dial gauge to measure the piston head pro-
jection. Take measurements at two location for
each cylinder.
• The measurement points of the piston head and
the reference point of the cylinder body are shown
in the illustration.
Measurement points: Points G1 and G2 of the piston
head
Reference point: Point R on the top face of the cylinder
body
Notice:
Note that there are three types of a cylinder head gasket
available as below, according to the piston projection.
• For each cylinder, calculate the average value (Ti)
of the piston projection.
• Find the maximum value (Ti max) of the average of
each cylinder.
• Based on the Timax obtained, select a gasket of
the appropriate grade.
4HF1/4HF1-2/4HG1-T
Cylinder Head Gasket Selection
4HE1-TC
Cylinder Head Gasket Selection
N6A0353E
N6A1628E
N6A1396E
N6A1397E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-57
5) Apply a 3 mm (0.12 in) bead or recommended
liquid gasket (Three Bond 1207C) or its equiv-
alent to the shaded areas shown in the illustra-
tion.
6) Install the cylinder head gasket with its “PART
NUMBER” mark facing up and toward the left of
the engine.
Caution:
Do not reuse the cylinder head gasket.
2. Cylinder Head Assembly
1) Align the cylinder body dowels and the cylinder
head dowel holes.
2) Carefully place the cylinder head on the cylin-
der head gasket.
3) Apply a coat of molybdenum disulfide grease to
the M14 cylinder head bolt threads and setting
faces and apply a coat of engine oil to the M10
cylinder head bolt threads and setting faces.
4) Use the angular tightening method to tighten
the bolts (M14) to the specified torque in three
steps following the numerical order shown in
the illustration.
Tighten:
Cylinder head bolt (M14: (1) — (18)) to
• 1st step: 98 N
⋅m (10 kg⋅m/72 lb⋅ft)
• 2nd step: 147 N
⋅m (15 kg⋅m/108 lb⋅ft)
• 3rd step: 30 — 60
°
Legend
1. Bead width
φ3
N6A0355E
N6A0356E
N6A0105E
N6A0490E
6A3-58 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
5) Tighten the cylinder head to the flywheel hous-
ing bolts (M10) to the specified torque.
Tighten:
Cylinder head bolt (M10: (19), (20)) to 38 N
⋅m (3.9 kg⋅m/
28 lb
⋅ft)
3. Camshaft Bearing Lower
4. Camshaft Assembly
5. Camshaft Bearing Upper
6. Camshaft Bearing Cap
7. Valve Cap
Above works refer to “CAMSHAFT ASSEMBLY”
section in this manual.
8. Rocker Arm Shaft Assembly
Above works refer to “ROCKER ARM SHAFT AS-
SEMBLY” section in this manual.
9. Injection Nozzle Holder Assembly
Tighten the nozzle holder flange nuts to the speci-
fied torque in the numerical order shown in the il-
lustration.
Tighten:
Nozzle holder flange nut to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
10. Glow Plug Connector
11. Head Cover Gasket
Install the gasket to the cylinder head cover.
12. Cylinder Head Cover
Above works refer to “CYLINDER HEAD COVER”
section in this manual.
13. Coolant Reserve Tank Hose/Bypass Hose
14. Radiator Upper Hose
Engine Left Side
1. Oil Level Gauge Guide Tube
1) Install the O-rings to the guide tube lower por-
tion and insert the guide tube completely to the
cylinder body.
2) Tighten the guide tube bolt to the specified
torque.
Tighten:
Guide tube bolt to 13 N
⋅m (1.3 kg⋅m/113 lb⋅in)
2. Engine Harness
N6A0491E
N6A0115E
N6A0390E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-59
Connect thermometer unit, thermo switch, tachom-
eter sensor and glow plug harness connector and
fasten the engine harness with clips.
3. Fuel Injection Pipe Assembly
Above works refer to “INJECTION PUMP ASSEM-
BLY” section in this manual.
4. Positive Crankcase Ventilation (PCV) Hose
5. Water Bypass Hose
6. Fuel Filter & Bracket
Tighten:
Fuel filter bracket to 34 N
⋅m (3.5 kg⋅m/25 lb⋅ft)
7. Fuel Pipe
Do not apply excessive force to the fuel pipe.
Tighten:
Fuel pipe joint bolt (1) to 41 N
⋅m (4.2 kg⋅m/30 lb⋅ft)
Tighten:
Fuel pipe joint bolt (2) to 23 N
⋅m (2.3 kg⋅m/17 lb⋅ft)
Tighten:
Clip screw to 4 N
⋅m (0.4 kg⋅m/35 lb⋅in)
8. Leak Off Pipe
Tighten:
Leak-off pipe joint bolt to 13 N
⋅m (1.3 kg⋅m/113 lb⋅in)
9. Nozzle Cover
10. Vacuum Hose
N6A0395E
Legend
1. Fuel pipe joint bolt
2. Fuel pipe joint bolt
3. Clip
N6A0399E
N6A0400E
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