Isuzu N-Series. Manual - part 482

Engine Mechanical (4HK1-TC)   6A-33

Torque Specifications

N6A6036E

6A-34   Engine Mechanical (4HK1-TC)

Turbocharger and Exhaust Manifold

Component

Legend

1. Oil Feed Pipe
2. Water Return Pipe
3. Turbocharger Assembly
4. Heat Protector
5. Heat Protector

6. Exhaust Adapter
7. Water Feed Pipe
8. Oil Return Pipe
9. Exhaust Manifold

 

Removal

1. Loosen the radiator drain cock to drain coolant.
2. Remove the air intake duct from the turbocharger

and the air cleaner.

3. Remove the charge air pipe from the turbocharger

and the charge air cooler.

4. Remove the front exhaust pipe.
5. Remove the EGR pipe.

6. Remove the A/C compressor harness.
7. Remove the A/C compressor bracket.

N6A6037E

Engine Mechanical (4HK1-TC)   6A-35

• Without disconnecting the hose of the A/C

compressor, remove the compressor from the
bracket and remove the compressor bracket
from the cylinder head.

Legend

1. Fixing Bolt
2. A/C Compressor Harness
3. A/C Compressor Bracket
4. A/C Compressor

 

• Remove the oil feed pipe.
• Remove the oil return pipe.
• Remove the oil feed pipe.

Legend

1. Oil Feed Pipe
2. Water Return Pipe
3. Heat Protector
4. Charge Air Hose
5. Inlet Duct
6. EGR Pipe

 

• Remove the water return pipe.

Legend

1. Water Return Pipe
2. Rubber Hose

 

• Remove the heat protector on the turbocharger.
• Remove the exhaust adapter bolts.
• Remove the four turbocharger clamping nuts.
• Remove the turbocharger from the exhaust

manifold.

Legend

1. Fixing Nut
2. Exhaust Adapter
3. Fixing Bolt
4. Fixing Nut

 

8. Remove the exhaust manifold.

N6A6014E

N6A6038E

N6A6039E

N6A6040E

6A-36   Engine Mechanical (4HK1-TC)

• Remove the 2 nuts and 6 bolts to remove the

exhaust manifold.

Inspection

• Inspection of the exhaust manifold

Inspect the plane surface of the plane on which the
manifold and the cylinder head are to be installed.

Caution:
If the plane surface exceeds the limit, replace it.

• Check a crack in the exhaust manifold visually.

Carefully inspect the turbocharger for abrasion and/or
excessive wear. Make any necessary adjustments,
repairs, and/or part replacements.

Wheel shaft axle play
Use a dial gauge to measure the wheel axle shaft play
when a fore of 12 N (2.6 lb) is alternately applied to
both sides of the compressor wheel.

Wheel shaft and bearing clearance
Use a dial gauge to measure the clearance between
the wheel shaft and the bearing.

Manifold installation plane surface

mm (in)

Standard

0.3 (0.01) or lower

Limit

0.5 (0.02)

N6A6041E

N6A6042E

Axle play

mm (in)

Standard

0.013 – 0.097 (0.0005 – 0.0038)

Limit

0.100 (0.0039)

Clearance

mm (in)

Standard

0.069 – 0.140 (0.0027 – 0.0055)

Limit

0.15 (0.0059)

N6A6043E