Isuzu N-Series. Manual — part 544
6F-6 Exhaust System
Torque Specifications
N6A6434E
Exhaust System 6F-7
Exhaust System
Service Precautions
Offset in position of the exhaust system during
assembly may sometimes cause vibrations or rattling
noise. Therefore, temporarily tighten the bolts until all
the parts have been positioned, and sequentially
tighten from the engine side to the rear pipe side.
Explanations on Functions and Operation
The exhaust brake assembly operates the auxiliary
brakes by adjusting the exhaust pressure. The tail pipe
has a built-in post silencer. (S-spec only) This improves
the silencing effect.
The main parts consist of the front exhaust pipe, center
exhaust pipe, exhaust brake unit, silencer, extension
pipe, and tail pipe.
Legend
1. Front Exhaust Pipe A
2. Exhaust Brake Assembly
3. Front Exhaust Pipe B
4. Silencer
5. Extension Pipe
6. Tail Pipe
Functional Check
• During check or repairs of the exhaust system,
confirm that the clearance between the body and
the floor is adequate.
• Adequate care should be taken to prevent damage
due to heating or vibrations in the body panel as it
may lead to exhaust gas entering the cabin.
• Check for loose or damaged connectors and
leakage of exhaust gas.
• Check for degradation, cracks or damage to the
clamp or rubber.
• If the pipe or silencer is damaged or has a dent
then repair or replace it.
• Check for dents, damage, holes or cracks due to
corrosion, and abnormal noise during operation.
List of Abnormal Phenomena
• Vibration or rattling noise from the exhaust system
• Clogging of the exhaust system
• Exhaust leakage or noise
1
2
3
6
4
5
N6A6435E
6F-8 Exhaust System
Trouble Shooting
Vibration or rattling noise from the exhaust system
Clogging of the exhaust system
Exhaust leakage or noise
Condition
Possible Cause
Correction
Vibration or rattling noise from the
exhaust system
Loose or misaligned components
Match the joints and then re-tighten.
Or, check for damage in the hanger,
mounting brackets and clamps.
Condition
Possible Cause
Correction
Clogging of the exhaust system
The exhaust brake is in the ON
status.
Refer to Section 6E, check the
electric system and repair if there
are abnormalities.
Check if the shaft movement in the
exhaust brake throttle valve moves
is jerky and replace if there is an
abnormality.
Clogging or deformation of the
exhaust piping
Repair or replace the exhaust
piping.
Condition
Possible Cause
Correction
Exhaust leakage or noise
Defect or misalignment in mounting
Match the joints and then re-tighten.
Damage or burn-out of exhaust
piping or silencer
Replace the damaged parts.
Defective components in the
exhaust system (clamps, pipes,
silencer)
Replace the defective parts.
Internal damage to silencer
Replace the silencer.
Exhaust System 6F-9
Exhaust Pipe
Removal
1. Remove the silencer fixing nut.
2. Remove the silencer brackets.
3. Remove the silencer.
4. Remove the front exhaust pipe B.
5. Remove the exhaust brake assembly.
6. Remove the front exhaust pipe A.
• Remove the clamps and then the front exhaust
pipe.
Inspection
• Adequate care should be taken to prevent damage
due to heating or vibrations in the body panel as it
may lead to exhaust gas entering the cabin.
• Check for loose or damaged connectors and
leakage of exhaust gas.
• Check for degradation, cracks or damage to the
clamp or rubber.
• Check for dents in the pipes or silencer and also
for cracks due to corrosion, and repair or replace in
case of damage.
Installation
Caution:
• Offset in the position of the exhaust system during
assembly may sometimes cause vibrations or
rattling noise. Therefore, temporarily tighten the
bolts until all the parts have been positioned and
then tighten sequentially from engine side to the
tail pipe side.
• Do not reuse the removed gasket or nuts.
1. Mount the front exhaust pipe A.
• Assemble the gasket, mount the front exhaust
pipe in the turbo charger, and tighten to the
specified torque.
Tighten:
Nut to 67 N
⋅m (6.8 kg⋅m/49 lb⋅ft)
• Clamp the front exhaust pipe.
Tighten:
M10 bolt to 41 N
⋅m (4.2 kg⋅m/30 lb⋅ft)
Caution:
Tighten the front exhaust pipe evenly and take care to
avoid gas leakage.
2. Mount the exhaust brake assembly.
• Assemble the gasket, connect the front exhaust
pipe and the front exhaust pipe B, and tighten.
Tighten:
Bolt to 17 N
⋅m (1.7 kg⋅m/12 lb⋅ft)
3. Mount the silencer.
• Assemble the gasket, mount to the front
exhaust pipe B, and tighten to the specified
torque.
Tighten:
Nut to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
4. Mount the silencer brackets.
• Mount the silencer in the brackets.
Tighten:
Nut to 34 N
⋅m (3.5 kg⋅m/25 lb⋅ft)
N6A6436E
N6A6437E
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