Isuzu N-Series. Manual - part 513

Engine Mechanical (4HK1-TC)   6A-157

Oil Cooler

Components

Legend

1. Bypass Hose
2. EGR Cooler Water Return Pipe
3. Oil Cooler
4. Fuel Rail

5. Fuel Supply Pump
6. EGR Cooler Water Feed Pipe
7. Suction Pipe

 

Removal

1. Remove the fuel rail.

Refer to “Fuel Rail” in Section 6C.

2. Remove the fuel supply pump.

3. Remove the A/C drive belt.

N6A6300E

N6A6055E

6A-158   Engine Mechanical (4HK1-TC)

4. Remove the idling pulley bracket.

• Remove the drive belt for A/C and the bracket

fixing bolts, and then remove the bracket along
with tensioner and idling pulley.

5. Remove the EGR cooler water return pipe.

• Remove the brackets to the water pipe at three

locations to make the pipe unsupported.

6. Remove the EGR cooler water feed pipe.
7. Remove the clip on the head side of the water

bypass hose and remove the hose from the
suction pipe and assembly.

Legend

1. Bypass Hose
2. EGR Cooler Water Return Pipe
3. EGR Cooler Water Feed Pipe
4. Suction Pipe

 

8. Remove the oil cooler assembly.

• Screw the removed fixing bolt of the oil cooler

into the replacer hole at the location 1 of the
figure and remove the oil cooler.

Legend

1. Oil Cooler Assembly

9. Remove the O-ring.

Disassembly

1. Remove the element mounting bolts.
2. Remove the element.
3. Remove the O-ring.

Legend

1. Element
2. O-ring

 

Reassembly

1. Install the O-ring on the oil cooler case.
2. Install the element.

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Engine Mechanical (4HK1-TC)   6A-159

3. Tighten the element fixing bolts using the specified

torque.

Tighten:
Bolts to 20 N

⋅m (2.0 kg⋅m/15 lb⋅ft)

Legend

1. Element
2. O-ring

 

Installation

1. Install the oil cooler assembly.

• Apply liquid gasket (ThreeBond1207C or

equivalent) to the flange surface groove
(cylinder block). Bead diameter must be
between 2 and 4 mm (0.08 and 0.16 in).
Refer to the illustration for the offset position
(no more than 1 mm (0.04 in)).

• Install the O-rings (1) and (2) to the oil passage

inlet and outlet. Do not allow the liquid gasket to
contact the O-ring.

Legend

1. O-ring
2. O-ring
3. Liquid Gasket

 

- Align the oil cooler holes with the cylinder

block studs.

- Install the oil cooler and glow plug controller

bracket to the cylinder block.

- Tighten the bolts to the specified torque in

the order shown in the illustration.

Tighten:
Bolts to 24 N

⋅m (2.4 kg⋅m/18 lb⋅ft)

• Liquid gasket quickly hardens.

Make it complete within 7 minutes after
applying the liquid gasket.

Legend

1. Oil Cooler Assembly

N6A6304E

N6A6305E

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6A-160   Engine Mechanical (4HK1-TC)

2. Install the water suction pipe.

• Apply liquid gasket (ThreeBond 1207C) to the

flange of the water suction pipe. Bead diameter
must be between 2 and 5 mm (0.008 and 0.20
in). Refer to the illustration for the offset
position (no more than 1 mm (0.04 in)).

• Install the water suction pipe to the oil cooler.

Refer to the illustration.

• Tighten the bolts to the specified torque.

Tighten:
Bolts to 24 N

⋅m (2.4 kg⋅m/18 lb⋅ft)

Legend

1. Liquid Gasket

 

Caution:
The water suction pipe must be installed immediately
after the oil cooler (the pipe and cooler use the same
liquid gasket).

3. Install the EGR cooler water feed pipe. 

• Install the O-ring on the EGR cooler water feed

pipe. 

• Install at the position shown in the figure and

tighten using the specified torque.

Tighten:
Bolts to 24 N

⋅m (2.4 kg⋅m/18 lb⋅ft)

4. Install the EGR cooler water pipe.
5. Install the body cover assembly LH on the surface

of the oil cooler and cylinder block and tighten it
using the specified torque.

Tighten:
Body cover assembly LH to 19 N

⋅m (1.9 kg⋅m/14 lb⋅ft)

6. Install the idling pulley bracket and tighten it using

the specified torque.

Tighten:
Idling pulley bracket to 24 N

⋅m (2.4 kg⋅m/18 lb⋅ft)

7. Install the A/C drive belt.

Refer to “Drive Belt” in Section 6B.

8. Remove the oil drain adapter.

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