Page 1809 of 4264
EXHAUST SYSTEM 6F – 15
TURBOCHARGER
MAIN DATA AND SPECIFICATIONS
Engine 4JA1T(L) 4JA1TC 4JH1TC
Model IHI RHF4H IHI RHF4H IHI RHF5
Turbine type Mixed type
Compressor type Backword & rake type
Maximum permissible speed rpm 190,000 190,000 180,000
IHI : Ishikawajima Harima Heavy Industries., Ltd.
Page 1810 of 4264
6F – 16 EXHAUST SYSTEM
GENERAL DESCRIPTION
036LV002
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.
Page 1811 of 4264

EXHAUST SYSTEM 6F – 17
INSPECTION AND REPAIR
Make the necessary adjustments, repairs, and part replacements if excessive wear or damage is discovered during
inspection.
Turbocharger pressure check
1. Remove the hose between the master gate and the
compressor outlet pipe.
2. Connect the pressure gauge. To compressor outlet
pipe.
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 300 mmHg.
Pressure Gauge : 5-8840-0075-0
150RY00030
Waste gate operation check
1. Remove the hose between the waste gate and the
compressor outlet pipe.
2. Connect the pressure gauge. To waste gate actuator.
3. Check to see that the rod begins to move when a
pressure of approximately 665 mmHg is applied to the
waste gate.
Note:
Do not apply a pressure greater than 1 kg/cm
2 to the
wastegate during this check.
150RY00031
Unit Inspection (Remove Turbo. from engine)
Check to see the pressure required to move the control
rod 2 mm is within the limits shown below.
Kpa/mmHg
4JH1TC 134.8/1011
4JA1TC 147.7/1108
150RY00032
Contact the “ISUZU MOTORS LIMITED” Dealer service
department or “IHI SERVICE FACILITY” for major repairs
and maintenance.
Important wheel shaft end play and bearing clearance
standards and limits are included below for your reference.
Page 1812 of 4264
6F – 18 EXHAUST SYSTEM
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
0.03 - 0.06
(0.001 - 0.002) 0.09 (0.004)
150RY00034
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
0.056 - 0.127
(0.0022 - 0.0050) 0.127 (0.0050)
150RY00036
Page 1813 of 4264
EXHAUST SYSTEM 6F – 19
SPECIAL TOOLS
ILLUSTRATION TOOL NUMBER TOOL NAME
901RX00143 5-8840-0075-0 Pressure Gauge
Page 1814 of 4264

6F – 20 EXHAUST SYSTEM
IHI SERVICE NETWORK
For inquiries relating to turbochargers, please contact your ISUZU distributor or the nearest IHI Turbocharger
Service Facility.
HEADQUARTERS
ISHIKAWAJIMA HARIMA HEAVY INDUSTRIES CO., LTD.(IHI)
General Machinery Division
Tokyo Chuo Building 1-6-2 Marunouchi Chiyoda-ku
Tokyo 100-0005 JAPAN
TEL: 81-(3)-3286-2405 to 2407 (3 lines)
FAX: 81-(3)-3286-2430
CHINA
IHI BEIJING OFFICE
Room 705, China World Trade Center, No. 1 Jian Guo Men Wai Avenue
Beijing, People’s Republic of CHINA
TEL: 86-(1)-505-4997, 0408
FAX: 86-(1)-505-4350
TLX: 210343 IHIPK CN
TAIWAN
IHI TAIPEI OFFICE
Room 1202, Chia Hsin Building, No. 96 Chung Shan
North Road, Section 2, Taipei, TAIWAN
TEL: 886-(2)-542-5520, 5521, 5523
FAX: 886-(2)-542-4362
TLX: 11320 IHICO
THAILAND
IHI BANGKOK OFFICE
8th Floor, Thaniya Building, 62 Silom Road, Bangkok, THAILAND
TEL: 66-(2)-236-3490, 7356, 9099
FAX: 66-(2)-236-7340
TLX: 82375 IHICO TH
MALAYSIA
IHI KUALA LUMPUR OFFICE
Letter Box No. 52, 22nd Floor, UBN Tower,
10 Jin. P. Ramlee 50250 Kuala Lumpur, MALAYSIA
TEL: 60-(3)-232-1255, 1271
FAX: 60-(3)-232-1418
TLX: IHI KLMA 20257
INDONESIA
IHI JAKARTA OFFICE
9th Floor, Skyline Building JI. M. H. Thamrin, No. 9, Jakarta, INDONESIA
TEL: 62-(21)-32-2147, 390-2211
FAX: 62-(21)-32-3273
TLX: 44175 IHIJKT
Page 1815 of 4264
ACCELERATOR CONTROL 6H – 1
SECTION 6H
ACCELERATOR CONTROL
TABLE OF CONTENTS
PAGE
Removal and Installation............................................................................................... 6H - 2
Removal...................................................................................................................... 6H - 6
Inspection................................................................................................................... 6H - 6
Installation.................................................................................................................. 6H - 6
Page 1816 of 4264
6H – 2 ACCELERATOR CONTROL
REMOVAL AND INSTALLATION
4JA1T(L)/RHD
RTW46HLF000301