Isuzu engine 4j series. Manual - part 97

TURBOCHARGER  6G – 1

SECTION 6G

TURBOCHARGER

CONTENTS

PAGE

Turbocharger ................................................................................................................... 6G - 2

Main Data and Specifications ..................................................................................... 6G - 2

General Description......................................................................................................... 6G - 3

Identification of Unit .................................................................................................... 6G - 4

Turbocharger Servicing .............................................................................................. 6G - 4

Precautions .................................................................................................................. 6G  - 4

Disassembly..................................................................................................................... 6G  - 5

Inspection and Repair ..................................................................................................... 6G - 7

Reassembly...................................................................................................................... 6G  - 9

IHI Service Net work ........................................................................................................ 6G -11

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6G – 2  TURBOCHARGER

TURBOCHARGER

MAIN DATA AND SPECIFICATIONS

Model
Turbine type
Compressor type
Maximum permissible speed

rpm

Wastegate opening pressure

kPa (mmHg)

Weight

N (kg/lb)

|
|

Centrifugal

180,000

|
|

IHI : Ishikawajima-Harima Heavy Industries., Ltd.

IHI RHF 4H

Mixed-flow

109 ± 4.4 (815 ± 33)

41 (4.2/9.3)

IHI RHB 5

Radial-inflow

120 ± 4.8 (898 ± 36)

45 (4.6/10.1)

TURBOCHARGER  6G – 3

GENERAL DESCRIPTION

The turbocharger internal mechanism consists of the turbine wheel, the compressor wheel, and the radial bearings.
These parts are supported by the bearing housing.
The turbocharger external mechanism consists of the compressor housing air intake port and the turbine housing
air exhaust port.
The turbocharger increases air intake efficiency. This results in increased engine power, reduced fuel consumption,
and minimal engine noise.
The turbocharger operates at very high speeds and temperatures. Part materials have been carefully selected and
machined to extremely high precision.
Turbocharger servicing requires great care and expertise.
If reduced performance is noted, check the engine for damage or wear. If there is no apparent engine damage or
wear, trouble with the turbocharger is indicated.

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6G – 4  TURBOCHARGER

  

IDENTIFICATION OF UNIT

The turbocharger nameplate gives the date of
manufacture and other important information required to
identify the unit when service inquiries are made.

The turbocharger nameplate has the following information
stamped on it.

!

Turbocharger Specification Number, Production Year
and Month

"

Production Date, Serial Number

#

ISUZU Parts Number

TURBOCHARGER SERVICING

1. Refer to TROUBLESHOOTING in this Manual to determine whether or not turbocharger repair or overhaul

is required.

2. The following procedures should also be performed (either with the turbocharger on the vehicle or removed

from the vehicle but not disassembled) to determine whether or not turbocharger repair or overhaul is
required.
*

Visual checks

*

Clearance measurements

*

End play measurements

Refer to INSPECTION AND REPAIR

3. The turbocharger compressor and turbine housing may be removed from the center housing and rotating

assembly (CHRA) for further visual inspection.
Refer to DISASSEMBLY and REASSEMBLY.

PRECAUTIONS

Turbocharger servicing requires great care and expertise.
Faulty turbocharger servicing procedures can result in serious damage to pistons, valves, cylinder liners, and other
important engine parts.
ISUZU does not recommended the performance of any servicing procedure not specified described in this Manual.
Contact your nearest IHI service facility to have the turbocharger assembly repaired or overhauled.
The identification plate and assembly number will be required by the service facility.
A list of IHI Turbocharger Service Network locations is given at the end of this Section.

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