Isuzu N-Series. Service manual — part 326
6A-46 ENGINE MECHANICAL
Reassembly
1. Crankshaft
2. Crankshaft Gear
1) Use a piston heater to heat the crankshaft gear
to 170 — 250
°C (338 — 482°F).
2) With the alignment mark “S” on the side of the
crankshaft gear turned outward, align the
groove on the gear side with the crankshaft pin
position and hammer it in with a crankshaft
gear installer until it hits the bottom.
Caution:
When hammered in with the gear slanted, the crank-
shaft gear may be caught in the middle and cannot be
hammered in fully. Hammer it inquickly enough not to al-
low a shaft line along the gear and the crankshaft to
slant.
Crankshaft Gear Installer: 8-9439-6819-0
3. Crankshaft Bearing Upper
When replacing the crankshaft or the crankshaft
bearing with a new one, select the crankshaft bear-
ing according to the respective grades stamped on
the crankshaft and the cylinder body.
Above works refer to “CRANKSHAFT” section in
this manual.
All upper bearings have oil grooves.
1) Carefully wipe any foreign material from the up-
per bearing.
Caution:
Do not apply engine oil to the bearing back faces and
the cylinder body bearing fitting surfaces.
2) Locate the position mark applied at disassem-
bly if the removed upper bearings are to be re-
used.
4. Thrust Bearing Upper
1) Install the thrust bearing upper to the front side
of the cylinder body No.5 journal. At this time,
the thrust bearing upper may be pasted to the
cylinder body with grease. However, wipe off
any excessive grease clean.
2) The thrust bearing oil grooves must be facing
the sliding faces.
N6A0223E
N6A0224E
Legend
1. Alignment mark
N6A0207E
ENGINE MECHANICAL 6A-47
5. Crankshaft Assembly
1) Apply an ample coat of the engine oil to the
crankshaft journals and the crankshaft bearing
surfaces before installing the crankshaft with
timing gear.
2) With the installed crankshaft pressed on to the
rear side, install the thrust bearing upper to the
rear side of the cylinder body No.5 journal.
3) The thrust bearing oil grooves must be facing
the sliding faces.
6. Crankshaft Bearing Lower
All lower bearings does not have oil grooves.
1) Carefully wipe any foreign material from the
lower bearing.
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
1) Install the thrust bearing lower to the rear side
of the crankcase No.5 journal.
2) 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.
N6A0226E
N6A0227E
N6A0228E
6A-48 ENGINE MECHANICAL
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
°
Tighten:
Crankcase bolt (M10: (1) — (17)) to 37 N
⋅m (3.8 kg⋅m /
27 lb
⋅ft)
Angle gauge: 5-8840-0266-0
9. Piston and Connecting Rod Assembly
10. Connecting Rod Lower Bearing
Legend
1. Liquid gasket
N6A1622E
N6A1415E
N6A0208E
ENGINE MECHANICAL 6A-49
11. Connecting Rod Cap Assembly
Above works refer to “PISTON AND CONNECT-
ING ROD” section in this manual.
12. Oil Pump Assembly
13. Idle Gear A
14. Flywheel Housing
15. Power Steering Pump Idle Gear
16. Power Steering Pump Idle Gear Cover
Above works refer to O”IL PUMP” section in this
manual.
17. Oil Thermo Valve (4HF1, 4HF1-2, 4HG1, 4HG1-T)
Insert the oil thermo valve into the cylinder body.
18. Bypass Valve (4HE1-TC)
Insert the bypass valve into the cylinder body.
19. Front Retainer
1) Carefully wipe any foreign material from the cyl-
inder body front face.
2) Apply 2.5 — 3.5 mm (0.10 — 0.14 in) bead of
the recommended liquid gasket (Three Bond
1207C) or its equivalent on the groove of the
front retainer fitting surface shown in the illus-
tration.
3) Install the O-rings (2 pieces) to the front retain-
er.
• Install the front retainer within 7 minutes after
application of liquid gasket.
• For the dislocation of liquid gasket, refer to the
illustration.
4) Align the cylinder body knock pins with the front
retainer knock pin holes.
Tighten:
Front retainer bolt to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
20. Water Pump Assembly
21. Water Pump Pulley
22. Oil Pump Strainer
N6A0195E
N6A0232E
Legend
1. O-ring
2. Liquid gasket
N6A1623E
N6A0234E
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