Isuzu N-Series. Manual - part 643

TURBOCHARGER 6G-5

DISASSEMBLY

Component

Legend

1. Bolt

4. Compressor housing

2. Turbine housing

5. Center housing and rotating assembly

3. Bolt

N6A3603E

6G-6 TURBOCHARGER

Disassembly Steps

1. Bolt

Apply a setting mark across the center housing and
rotating assembly (1), the turbine housing (2), and
the compressor housing (3).

2. Turbine Housing
3. Bolt
4. Compressor Housing
5. Center Housing and Rotating Assembly

1) Loosen the bolts.
2) Disassembly the parts.

Handle the parts with extreme care.
Be particularly careful not to damage the tur-
bine wheel blades and the compressor wheel
blades. Take care not to allow foreign material
to enter the center housing.

Notice:
Disassembly and servicing of the center housing and ro-
tating assembly is not recommended.

N6A3604E

N6A3605E

TURBOCHARGER 6G-7

INSPECTION AND REPAIR

Make the necessary adjustments, repairs, and part re-
placements if excessive wear or damage is discovered
during inspection.
Minor servicing operations are described in this Section.
Contact the nearest IHI SERVICE FACILITY for major
repairs and maintenance.
Refer to “IHI SERVICE NETWORK” at the end of this
Section.
Turbocharger Pressure Check

1. Remove the waste gate control chamber connect-

ing hose.

2. Connect the pressure gauge.
3. Start the engine and gradually increase the engine

speed (the vehicle must be stationary with no load
applied to the engine).

4. Check to see that turbocharger pressure rises to

approximately 500 mmHg.
Pressure Gauge: 5-8840-0075-0

Waste Gate Operation Check

1. Remove the hose between the waste gate control

chamber and the intake pipe.

2. Connect the pressure gauge.
3. Check to see that the rod begins to move when a

pressure of approximately 665 mmHg is applied to
the waste gate, control chamber.

Notice:
Do not apply a pressure greater than 1467 mmHg (196
kPa) to the waste gate during this check.

4. Check to see the pressure required to move the

control rod 2 mm is within the limits shown below.

Important wheel shaft end play and bearing clearance
standards and limits are included below for your refer-
ence.

N6A3606E

Legend

1. Rod
2. Pressure

Control Rod Operating 
Pressure

kPa (mmHg)

4JB1-TC (IHI RHF4)

109 

± 4.4 (815 ± 33)

N6A3607E

N6A3608E

6G-8 TURBOCHARGER

Wheel Shaft End Play
Use a dial indicator to measure the wheel shaft end play.
Apply a force of 1.2 kg (2.6 lb / 11.8 N) alternately to the
compressor wheel end and the turbine wheel end.

Wheel Shaft and Bearing Clearance
Use a dial indicator to measure the wheel shaft and
bearing clearance.

Wheel Shaft End Play

mm (in)

Standard

Limit

0.02 — 0.08 (0.0008 — 

0.0031)

0.09 (0.0035)

Wheel Shaft and Bearing 
Clearance

mm (in)

Standard

Limit

0.07 — 0.12 (0.0028 — 

0.0047)

0.16 (0.0063)

N6A3609E

N6A3610E

Legend

1. Oil return port
2. Oil feed port

N6A3611E

N6A3612E