Isuzu N-Series. Manual — part 365
6A3-112 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
31. Crankshaft Rear Oil Seal
32. Crankshaft Rear Slinger
Above works refer to “CRANKSHAFT REAR OIL
SEAL” section in this manual.
33. Spacer Rubber
Remove the stiffener before removing the spacer
rubber.
34. Oil Pan
35. Oil Pump Strainer
36. Water Pump Pulley
37. Water Pump
38. Front Retainer
Install the three front retainer fixing bolts to the
front retainer replacer holes as shown in the illus-
tration, and tighten the bolts alternately a little at a
time.
39. Oil Thermo Valve (4HF1, 4HF1-2, 4HG1, 4HG1-T)
Pull out the thermo valve from the cylinder body.
40. Bypass Valve (4HE1-TC)
Pull out the bypass valve from the cylinder body.
Legend
1. Washer
2. Pilot bearing
N6A6504E
N6A0193E
N6A0639E
N6A0640E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-113
41. Power Steering Pump Idle Gear Cover
42. Power Steering Pump Idle Gear
43. Flywheel Housing
44. Idle Gear A
45. Oil Pump Assembly
Above works refer to “TIMING GEAR REPLACE-
MENT” section in this manual.
46. Connecting Rod Cap Assembly
47. Connecting Rod Lower Bearing
48. Piston and Connecting Rod Assembly
Above works refer to “PISTON AND CONNECT-
ING ROD” section in this manual.
49. Crankcase
1) Loosen the crankcase bolts in numerical order
a little at a time.
2) Install the three crankcase fixing bolts (See ar-
row marks) to the crankcase replacer holes as
shown in the illustration, and tighten the bolts
alternate a little at a time.
Notice:
When removing the crankcase, be sure to remove the oil
pump and the generator bracket before that.
50. Thrust Bearing Lower
51. Crankshaft Bearing Lower
52. Crankshaft Assembly
53. Thrust Bearing Upper
54. Crankshaft Bearing Upper
N6A0641E
N6A0642E
N6A0643E
6A3-114 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
55. Crankshaft Gear
1) Use the crankshaft gear remover to remove the
crankshaft gear.
Crankshaft Gear Remover: 8-9439-6818-0
2) Remove the crankshaft feather key.
56. Crankshaft
Installation
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. Gear it in quickly enough not to allow
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.
Refer to the “CRANKSHAFT”.
All upper bearings have oil grooves.
Legend
1. Crankshaft assembly
2. Thrust bearing upper
3. Crankshaft bearing upper
N6A0644E
N6A0645E
Legend
1. Alighment mark
N6A0646E
N6A0647E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-115
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
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, be sure to wipe off any excessive
grease.
Caution:
The thrust bearing oil grooves must be facing the sliding
faces.
5. Crankshaft Assembly
Apply an ample coat of engine oil to the crankshaft
journals and the crankshaft bearing surfaces be-
fore installing the crankshaft with timing gear.
• While pressing on the installed crankshaft to-
ward the rear side, insert the thrust bearing up-
per into the rear side of the cylinder body No.5
journal.
Caution:
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
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.
N6A0648E
N6A0649E
N6A0650E
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