Isuzu engine 4j series. Manual - part 98

TURBOCHARGER  6G – 5

DISASSEMBLY

Disassembly Steps

1.

Bolt

4.

Compressor housing

2.

Turbine housing

5.

Center housing and rotating assembly

3.

Bolt

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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 turbine wheel
blades and the compressor wheel blades. Take care
not to allow foreign material to enter the center
housing.

NOTE:

Disassembly and servicing of the center housing and
rotating assembly is not recommended.

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TURBOCHARGER  6G – 7

 INSPECTION AND REPAIR

Make the necessary adjustments, repairs, and part replacements 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 connecting 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.

NOTE:

Do not apply a pressure greater than 1467mmHg (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.

Control Rod Operating Pressure

mmHg (kPa)

4JBIT (IHI RHB5)

898 ± 36 (120 ± 4.8)

4JBITC (IHI RHF4)

815 ± 33 (109 ± 4.4)

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6G – 8  TURBOCHARGER

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

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/11.8N) alternately to the compressor
wheel end and the turbine wheel end.

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
Use a dial indicator to measure the wheel shaft and bearing
clearance.

Wheel Shaft and Bearing Clearance

mm (in)

Standard

Limit

0.07 - 0.12

(0.0028 - 0.0047)

0.16 (0.0063)

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