Isuzu N-Series. Manual - part 334

6A-78 ENGINE MECHANICAL

4HE1-TC
4HE1-TC engines use a larger rubber spacer than other
engines.

33. Generator Bracket

Tighten:
Generator bracket bolt to 48 N

⋅m (4.9 kg⋅m / 35 lb⋅ft)

34. Fan Belt Adjust Plate

Install the adjust plate and temporarily tighten the
adjust plate bolt.

35. Oil Cooler Assembly

1) Apply 2 — 3 mm (0.08 — 0.12 in) bead of the

recommended liquid gasket (Three Bond
1207C) or its equivalent on the oil cooler fitting
surface.

2) Apply a coat of engine oil to the O-rings (2 piec-

es) and install the O-rings to the oil cooler.

Legend

1. Cover

N6A0294E

N6A1642E

N6A0293E

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ENGINE MECHANICAL 6A-79

Notice:
Take care that the O-ring is not smeared with liquid gas-
ket.

• Install it within 7 minutes after application of liq-

uid gasket.

• For the dislocation of liquid gasket, refer to the

illustration.

3) Tighten the oil cooler bolts and nut to the spec-

ified torque a little at a time in the sequence
shown in the illustration.

Tighten:
Oil cooler bolt and nut to 24 N

⋅m (2.4 kg⋅m / 17 lb⋅ft)

36. Water Suction Pipe

1) Apply 2 — 3 mm (0.08 — 0.12 in) bead of the

recommended liquid gasket (Three Bond

1207C) or its equivalent on the groove of the
water suction pipe fitting surface.

2) Install the water suction pipe to the oil cooler.

• For the dislocation of liquid gasket, refer to the

illustration.

Tighten:
Water suction pipe bolt and nuts to 24 N

⋅m (2.4 kg⋅m /

17 lb

⋅ft)

Notice:
Install the water suction pipe immediately after the in-
stallation of the oil cooler.

37. Heater Pipe

1) Install the O-ring to the heater pipe.
2) Install the heater pipe to the oil cooler.

Legend

1. O-ring
2. Liquid gasket

N6A1626E

N6A0320E

Legend

1. Liquid gasket

N6A1627E

N6A0322E

6A-80 ENGINE MECHANICAL

Tighten:
Heater pipe bolt to 24 N

⋅m (2.4 kg⋅m / 17 lb⋅ft)

38. Idle Pulley Bracket (If equipped with A/C)

Tighten:
Idle pulley bracket bolt to 48 N

⋅m (4.9 kg⋅m / 35 lb⋅ft)

39. Injection Pump Rubber Spacer

Stick the rubber spacer to the location indicated in
the illustration with pressure sensitive adhesive
double coated tape.

40. Injection Pump Assembly (Except 4HF1-2)

1) Turn the crankshaft until the timing mark on the

crankshaft damper pulley is aligned with “13

°”

line.

Notice:
BTDC 13

° to be aligned with here is an angle at which

the injection pump is installed, and has nothing to do
with the injection timing.

2) Remove the inspection hole plug from the cyl-

inder body.

3) Install the O-ring to the injection pump bracket.
4) Align the injection pump bracket slit with the

timer slit.

5) Install the injection pump assembly to the cylin-

der body.

Notice:
When the injection pump has a poor gear engagement
while installing the assembly to the cylinder body, insert
a screwdriver into the slit on the timer peripheral with the

Legend

A. 4HF1-2

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N6A0289E

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ENGINE MECHANICAL 6A-81

pump bracket slit used as a guide, and move it up and
down to get it into forcibly.

6) After installation of the injection pump, the in-

jection timing can be checked through the tim-
ing check hole provided to the injection pump
bracket.
Set the No.1 cylinder to BTDC (Injection timing
of each engine model) on the compression
stroke. When the pointer of the timing check
hole comes in line with the mark on the timer
periphery of the injection pump as shown in the
illustration, the injection timing is normal. After
completion of the injection timing check, tighten
the check hole plug to the specified torque.

7) Turn the crankshaft until the timing mark on the

crankshaft damper pulley is aligned with “8

°”

(98EPA) or “9

°” (Spec EURO3) line.

Notice:
Position in its normal rotating direction. (for 4HE1-TC
only)

Legend

1. Pointer
2. Timer outside mark
3. Timing check hole

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N6A0328E

Injection Timing

deg

4HF1

4HE1-TC (4HE1-XS, 

XN)

BTDC 8

4HG1

BTDC 9

4HG1-T

BTDC 7 (Except Colombia)

BTDC 9 (For Colombia)

4HE1-TC (4HE1-XS)

BTDC 9 (Spec EURO3)

Legend

A. For 4HF1-TC

1. Timing check hole
2. 8

° Mark

3. 13

° Mark

4. Pointer

N6A0329E