Isuzu N-Series. Manual — part 343
6A3-24 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
4HE1-TC (98EPA)
EXHAUST GAS RECIRCULATION SYSTEM (EGR)
Component
Removal
1. EGR pipe assembly
2. EGR valve
Installation
1. EGR valve
Insert the gasket and install the EGR valve to the
intake manifold.
Notice:
The gasket of 4HE1-XS and 4HE1-XN are dirrerent.
Tighten:
EGR valve bolt to 23.5
± 5 N⋅m (2.4 ± 0.5 kg⋅m/17 ± 3.7
lb
⋅ft)
Legend
1. EGR pipe assembly
2. EGR valve
N6A1601E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-25
2. EGR Pipe assembly
Install the EGR pipe assembly to the exhaust man-
ifold and the EGR valve with gasket.
Tighten:
A: Bolt to 23.5
± 5 N⋅m (2.4 ± 0.5 kg⋅m/17 ± 3.7 lb⋅ft)
B: Nut to 28.4
± 4 N⋅m (2.9 ± 0.4 kg⋅m/21 ± 3.1 lb⋅ft)
C: Bolt to 23.5
± 5 N⋅m (2.4 ± 0.5 kg⋅m/17 ± 3.7 lb⋅ft)
Legend
1. EGR valve
2. Inlet case
N6A0405E
A
C
B
N6A1602E
6A3-26 ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T)
EXHAUST MANIFOLD
Component
Removal
Preparation
• Disconnect battery ground cable.
• Tilt the cab.
1. Air Conditioning (A/C) Compressor (If equipped
with A/C)
1) Disconnect magnetic clutch harness connec-
tor.
2) Dismount the compressor together with the
hoses from the A/C compressor bracket, and
fasten it to the appropriate location with a wire.
2. A/C Compressor Bracket (If equipped with A/C)
3. Front Exhaust Pipe
4. Heat Protector
5. Exhaust Manifold
6. Exhaust Gasket
Legend
1. A/C compressor (If equipped with A/C)
4. Heat protector
2. A/C compressor bracket (If equipped with A/C)
5. Exhaust manifold
3. Front exhaust Pipe
6. Exhaust gasket
N6A0411E
ENGINE (4HF1 / 4HF1-2 / 4HE1-TC / 4HG1 / 4HG1-T) 6A3-27
Installation
1. Exhaust Gasket
Insert the gasket into the stud provided to the cyl-
inder head (with the projection (1) of the gasket on
this side).
2. Exhaust Manifold
1) Install exhaust manifold gaskets (1), exhaust
manifold (2), distance pieces (3), dish washers
(4) and nuts (5) to the stud bolts shown in the
illustration.
2) Tighten the nuts to the specified torque in the
numerical order shown in the illustration.
Tighten:
Exhaust manifold nut to 34 N
⋅m (3.5 kg⋅m/25 lb⋅ft)
3. Heat Protector
Tighten:
Heat protector bolt to 10 N
⋅m (1.0 kg⋅m/7 lb⋅ft)
4. Front Exhaust Pipe
Tighten:
Front exhaust pipe to
• Exhaust manifold side: 67 N
⋅m (6.8 kg⋅m/49 lb⋅ft)
• Exhaust brake side: 17 N
⋅m (1.7 kg⋅m/12 lb⋅ft)
5. Air Conditioning (A/C) Compressor Bracket (If
equipped with A/C)
Tighten fixing bolts to the specified torque.
Tighten:
A/C compressor bracket bolt to 48 N
⋅m (4.9 kg⋅m/35
lb
⋅ft)
N6A0412E
N6A0413E
N6A0414E
N6A0415E
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