Isuzu N-Series. Service manual — part 342
6A3-20 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
Tighten:
Fuel pipe joint bolt (1) to 41 N
⋅m (4.2 kg⋅m/30 lb⋅ft)
Tighten:
Fuel pipe joint bolt (2) to 23 N
⋅m (2.3 kg⋅m/17 lb⋅ft)
Tighten:
Clip screw to 4 N
⋅m (0.4 kg⋅m/35 lb⋅in)
8. Leak Off Pipe
Tighten:
Leak-Off pipe joint bolt to 13 N
⋅m (1.3 kg⋅m/113 lb⋅in)
9. Nozzle Cover
10. Vacuum Hose
11. Intake Air Duct
• Connect the negative battery cable.
• Lower the cab.
• Start engine and check for fuel leakage careful-
ly.
Legend
1. Fuel pipe joint bolt
2. Fuel pipe joint bolt
3. Clip
N6A0399E
N6A0400E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-21
4HE1-TC (4HE1-XS) for EURO3
EXHAUST GAS RECIRCULATION SYSTEM (EGR)
Component
Removal
1. Water hose (out)
2. Water hose (in)
3. EGR pipe (right side)
4. EGR pipe (left side)
5. EGR valve
6. EGR cooler
7. EGR cooler bracket
Installation
1. EGR Cooler Bracket
Temporarily tighten the EGR cooler bracket (B) to
the EGR cooler bracket (A).
Tighten:
EGR cooler bracket bolt (A) to 31 N
⋅m (3.2 kg⋅m/23 lb⋅ft)
Legend
1. Water hose (out)
5. EGR valve
2. Water hose (in)
6. EGR cooler
3. EGR pipe (right side)
7. EGR cooler bracket
4. EGR pipe (left side)
N6A0401E
6A3-22 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
2. EGR Cooler
1) Temporarily tighten the EGR cooler bolts left
side.
2) Tighten the EGR cooler bolt right side.
Tighten:
EGR cooler bracket bolt (right side) to 33 N
⋅m (3.4 kg⋅m/
25 lb
⋅ft)
3. EGR Valve
Insert the gasket and install the EGR valve to the
intake manifold.
Tighten:
EGR valve bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
4. EGR Pipe (left side)
Insert the gasket into the left-hand EGR pipe (1).
Install the pipe between the EGR valve (2) and the
EGR cooler (3).
Tighten:
EGR pipe (left side) bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
5. EGR Pipe (right side)
1) Insert the gasket into the right-hand EGR pipe
(refer to the illustration). Install the pipe be-
tween the exhaust manifold and the EGR cool-
er.
Tighten:
EGR pipe nut and bolt to 28 N
⋅m (2.9 kg⋅m/21 lb⋅ft)
Legend
1. EGR cooler
2. Left side
3. Right side
N6A0403E
N6A0404E
Legend
1. EGR valve
2. Inlet case
N6A0405E
N6A0406E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-23
2) Adjust bracket position to eliminate any play
using the bracket adjustment holes. Tighten the
bolts as shown by the arrows in the illustration.
Tighten:
EGR cooler bracket bolt to
• Right side (1): 26 N
⋅m (2.7 kg⋅m/20 lb⋅ft)
• Left side (2): 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
6. Water Hose (in)
Arrange the clips so that the jaws face the side of
the engine.
7. Water Hose (out)
Insert clip (2) so that the jaws face the side of the
engine.
Install clip (3) so that the jaws face away from the
engine.
Legend
1. EGR pipe
2. Exhaust manifold
3. EGR cooler
4. TAB
N6A0407E
N6A0408E
Legend
1. Water hose (in)
2. Clip
Legend
1. Water hose (out)
2. Clip
3. Clip
4. Band clip
N6A0409E
N6A0410E
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