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