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Here is the instruction on how to remove and install exhaust pipe for ISUZU 4JJ1 enigne Euro 4 N series.

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Removal 

Remove the tail pipe.
1.Remove the clamps and tail pipe.
2. Remove the silencer.
3. Remove the front exhaust pipe B.
4. Remove the exhaust brake.Remove the vacuum hose and the exhaust brake assembly.
5. Remove the front exhaust pipe A.
6.Remove the clamp, and then remove the front pipe.

Inspection
1. Externally inspect the exhaust pipe components.
Damage caused by heat from the body panel or vibrations can cause exhaust gas to enter the cabin. Be careful.
Inspect for loose or damaged connections and exhaust gas leaks.
Inspect the clamp and rubber for degradation, cracks or damage.
Inspect the pipe or silencer for dents, or cracks caused by corrosion. If damaged, repair or replace them.


Installation
NOTE:
Vibrations and looseness of the exhaust system can be caused by miss-positioning when assembling. Temporarily install the bolts while all the components are positioned. After positioning is completed, tighten them from the engine side to the tail pipe side.


Do not reuse the removed gasket or nut.
1. Install the front exhaust pipe A.
Tightening torque:
67 N.m (6.8 kg.m/ 49 Ib.t)
 

NOTE:
Uniformly tighten the front exhaust pipe so that there is no gas leak.

2. Install the exhaust brake assembly and the front exhaust pipe B.

Attach the vacuum hose.
Tightening torque:
27 N-m (2.8 kg.m/ 20 Ib.ft)
3. Install the silencer to the front pipe B.
Tightening torque:
22 N.m (2.2 kg-m/ 16 Ib-ft)

4. Connect the tail pipe.
Tighten the clamp.
Tightening torque: 22 N-m (2.2 kg-m/ 16 Ib.f) .

Start the engine after assembling each part,and check for gas leakage from each joint and for vibration.
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