Isuzu N-Series. Manual — part 371
6A3-136 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
18. Power Steering Pump Idle Gear Cover
Install the gear cover with the O-ring.
Tighten:
Gear cover bolt to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
19. Oil Thermo Valve (4HF1, 4HF1-2, 4HG1, 4HG1-T)
Insert the oil thermo valve into the cylinder body.
20. Bypass Valve (4HE1-TC)
Insert the bypass valve into the cylinder body.
N6A0183E
N6A0446E
N6A0447E
N6A0640E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-137
21. Front Retainer
1) Carefully wipe any foreign material from the cyl-
inder body front face.
2) Apply a 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 the 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)
22. Water Pump Assembly
1) Apply 3 — 4 mm (0.12 — 0.16 in) bead of the
recommended liquid gasket (Three Bond
1207C) or its equivalent on the water pump fit-
ting surface.
2) Install the water pump to the front retainer.
Tighten:
Water pump bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
• Install the water pump within 7 minutes after
application of liquid gasket.
• For the dislocation of liquid gasket, refer to the
illustration.
Caution:
The water pump clamping bolt is also used to tighten the
front retainer. So, install the water pump before liquid
gasket gets dry immediately after installation of the front
retainer.
N6A0641E
N6A1623E
Legend
1. O-ring
2. Liquid gasket
N6A0234E
6A3-138 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
23. Water Pump Pulley
Tighten:
Water pump pulley bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
24. Oil Pump Strainer
Install the O-ring (1) to the oil pump strainer pipe
and install the oil pump strainer to the cylinder body
shown in the illustration.
Tighten:
Oil pump strainer bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
25. Oil Pan
Above works refer to “OIL PAN” section in this
manual.
26. Spacer Rubber
Above works refer to “OIL PAN” section in this
manual.
27. Crankshaft Rear Slinger
28. Crankshaft Rear Oil Seal
Above works refer to “CRANKSHAFT REAR OIL
SEAL” section in this manual.
29. Flywheel Assembly
1) Align the flywheel with the crankshaft knock pin
and temporarily tighten the flywheel bolts.
2) Use the crankshaft stopper to prevent the
crankshaft from turning.
Crankshaft Stopper: 5-8840-2230-0
3) Install the washer and the flywheel bolts and
tighten to the specified torque in the numerical
order show in the illustration.
Tighten:
Flywheel bolt to
• 1st step: 78 N
⋅m (8.0 kg⋅m/58 lb⋅ft)
• 2nd step: 90 — 120
°
Legend
1. Liquid gasket
Legend
1. Pulley
2. Set plate
N6A1625E
N6A0656E
N6A0657E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-139
4) Remove the crankshaft stopper.
30. Crankshaft Front Slinger
31. Crankshaft Front Oil Seal
Above works refer to “CRANKSHAFT FRONT OIL
SEAL” section in this manual.
32. Crankshaft Damper Pulley
1) Apply a coat of the engine oil to the threads of
the bolts.
2) Align the damper pulley with the crankshaft
knock pin and tighten the bolts to the specified
torque in the numerical order.
Tighten:
Damper pulley bolt to 200 N
⋅m (20.4 kg⋅m/147 lb⋅ft)
33. Cover
Tighten:
Cover Bolt to 13 N
⋅m (1.3 kg⋅m/113 lb⋅in)
4HE1-TC
4HE1-TC engines use a larger rubber spacer than
other engines.
34. Generator Bracket
Tighten:
Generator bracket bolt to 48 N
⋅m (4.9 kg⋅m/35 lb⋅ft)
Legend
1. Washer
2. Pilot bearing
N6A6504E
N6A0607E
Legend
1. Cover
N6A0294E
N6A1642E
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