Isuzu N-Series. Manual — part 580
6A1-8 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
INLET MANIFOLD
Component
Removal
Preparation
• Disconnect battery ground cable.
• Drain coolant.
1. Vacuum Hose
2. Air Intake Duct
3. PCV Hose
4. Injection Pipe
• Release injection pipe clip.
• Loosen the flare nut on the injection pump side.
• Loosen the flare nut on the injection nozzle side,
disconnect and put a side the pipe.
5. Oil Level Gauge Guide Tube
Legend
1. Vacuum hose
5. Oil level gauge guide tube
2. Air intake duct
6. Oil cooler water pipe (Oil Cooler Model)
3. PCV hose
7. Inlet manifold
4. Injection pipe
N6A3230E
N6A3231E
4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-9
• Remove the fixing bolt and remove level gauge
guide tube.
6. Oil Cooler Water Pipe (Oil Cooler Model)
• Remove the water pipe bracket bolt.
• Remove the inlet manifold fixing nut.
7. Inlet Manifold
• Remove the manifold fixing bolt and nut.
Installation
1. Inlet Manifold
• Tighten the fixing bolts and nuts to the specified
torque.
Tighten:
• Bolt & nut to 19 N
⋅m (1.9 kg⋅m / 14 lb⋅ft)
2. Oil Cooler Water Pipe (Oil Cooler Model)
• Install the water pipe and tighten the manifold with
water pipe.
• Tighten the pipe bracket bolt of cylinder head rear
side.
3. Oil Level Gauge Guide Tube
• Install the guide tube and tighten the manifold with
guide tube.
4. Injection Pipe
• Connect the injection pipe and tighten flare nut to
the specified torque.
Tighten:
• Flare nut to 29 N
⋅m (3.0 kg⋅m / 22 lb⋅ft)
• Install the pipe clip to the original position.
5. PCV Hose
6. Air Intake Duct
7. Vacuum Hose
• Connect the battery ground cable.
• Pour coolant.
• Start the engine and check coolant leakage.
N6A3232E
N6A3233E
N6A3781E
6A1-10 4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE
EXHAUST MANIFOLD
Component
Removal
Preparation
• Disconnect battery ground cable.
1. Vacuum Hose (Exhaust Brake Model)
• Remove the vacuum actuator hose.
2. Front Exhaust Pipe Nut
• Remove the fixing nuts from exhaust manifold side.
3. Front Exhaust Pipe Stay Bolt
4. Heat Protector
Legend
1. Vacuum hose
4. Heat protector
2. Front exhaust pipe nut
5. Exhaust manifold
3. Front exhaust pipe stay bolt
N6A3235E
N6A3236E
4JB1/4JB1-TC/4JG2/4JH1-TC - ENGINE 6A1-11
5. Exhaust Manifold
• Remove the manifold bolt and nut, then remove the
manifold and gasket.
Installation
1. Exhaust Manifold
• Tighten the fixing nuts and bolts to the specified
torque.
Tighten:
• Manifold bolt to 26 N
⋅m (2.7 kg⋅m / 20 lb⋅ft)
2. Heat Protector
• Remove the heat protector and tighten to the spec-
ified torque.
Tighten:
• Heat protector bolt to 19 N
⋅m (1.9 kg⋅m / 14 lb⋅ft)
3. Front Exhaust Pipe Stay Bolt
• Tighten the fixing bolts to the specified torque.
Tighten:
• Stay bolt to 40 N
⋅m (4.1 kg⋅m / 30 lb⋅ft)
4. Front Exhaust Pipe Nut
• Tighten the fixing nuts to the specified torque.
Tighten:
• Without exhaust brake to 69 N
⋅m (7 kg⋅m / 51 lb⋅ft)
• With exhaust brake to 69 N
⋅m (7 kg⋅m / 51 lb⋅ft)
5. Vacuum Hose (Exhaust Brake Model)
• Install the two hose a vacuum actuator.
• Connect battery ground cable.
• Start the engine and check coolant leakage.
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