Isuzu N-Series. Manual - part 642

TURBOCHARGER 6G-1

ENGINE 4J SERIES

SECTION 6G

TURBOCHARGER

Contents

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

Component ........................................................6G-5
Disassembly Steps ............................................6G-6

INSPECTION AND REPAIR .................................6G-7
REASSEMBLY......................................................6G-9

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

IHI SERVICE NETWORK ...................................6G-10

6G-2 TURBOCHARGER

TURBOCHARGER

Main Data and Specifications

IHI: Ishikawajima-Harima Heavy Industries., Ltd.

Model

IHI RHF 4H

IHI RHB 5

Turbine type

Mixed-flow

Radial-inflow

Compressor type

Centrifugal

Maximum permissible speed

rpm

180,000

Wastegate opening pressure

kPa (mmHg)

109 

± 4.4 (815 ± 33)

120 

± 4.8 (898 ± 36)

Weight

N (kg/lb)

41 (4.2/9.3)

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.

N6A3600E

6G-4 TURBOCHARGER

Identification of Unit

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

The turbocharger nameplate has the following informa-
tion stamped on it.

1. Turbocharger Specification Number, Production

Year and Month

2. Production Date, Serial Number
3. 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 per-

formed (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 ro-
tating assembly (CHRA) for further visual inspec-
tion.
Refer to DISASSEMBLY and REASSEMBLY.

Precautions

Turbocharger servicing requires great care and exper-
tise.
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 Man-
ual.
Contact your nearest IHI service facility to have the tur-
bocharger assembly repaired or overhauled.
The identification plate and assembly number will be re-
quired by the service facility.
A list of IHI Turbocharger Service Network locations is
given at the end of this Section.

N6A3601E

N6A3602E