Sign In
Upload
Download
Table of Contents
Contents
Add to my manuals
Delete from my manuals
Share
URL of this page:
HTML Link:
Bookmark this page
Add
Manual will be automatically added to "My Manuals"
Print this page
×
Bookmark added
×
Added to my manuals
Manuals
Brands
Isuzu Manuals
Engine
NPR 4J Series
Workshop manual
Isuzu NHR 4J Series Workshop Manual
Hide thumbs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
Table Of Contents
407
page
of
407
Go
/
407
Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Service Information Contents
Table of Contents
Troubleshooting Contents
Hard Starting
Starter Inoperative
Starter Motor Operates but Engine Does Not Turn over
Engine Turns over but Does Not Start
Quick-On Start System
Unstable Idling
Insufficient Power
Excessive Fuel Consumption
Excessive Oil Consumption
Overheating
White Exhaust Smoke
Dark Exhaust Smoke
Oil Pressure Does Not Rise
Abnormal Engine Noise
Engine Knocking
Gas Leakage Noise
Continuous Noise
Slapping Noise
Engine Cooling Trouble
Engine Electrical Part Trouble
Engine Has Less than Normal Power
Turbocharger
Blue or Black Smoke
Excessive Turbocharger Noise
Excessive Rotating Part Wear
4JB1, 4JB1TC, 4JG2, Oil Filter and Oil Cooler
Lubrication Chart
Main Data and Specifications
Engine Cooling
Starting System
Charging System
Engine Mechanical
Service Standard
Model Identification
Air Cleaner
Dust Fouled Element
Servicing
Lubricating System
Main Oil Filter (Cartridge Type Paper Element) Replacement Procedure
Fuel Filter Water Draining Procedure
Replacement Procedure
Fuel System
Engine Coolant Change Procedure
Cooling System
Coolant Level
Air Bleeding
Cooling System Inspection
Radiator Cap Inspection
Thermostat Operating Test
Drive Belt Adjustment
Cooling Fan Pulley Drive Belt
Compressor Pulley Drive Belt
Power Steering Oil Pump Pulley Drive Belt
Engine Control
Idling Speed Inspection
Idling Speed Adjustment
Accelerator Control Cable Adjustment
Valve Clearance Adjustment
Injection Timing Adjustment
Quick-On Start System Inspection Procedure
Quick-On Start II System (4JB1 / 4JB1T / 4JB1TC Only)
Compression Pressure Measurement
Quick-On Start III System (4JG2 Only)
Cylinder Head Cover, Cylinder Head Rocker, Shaft Braker
Fixing Torque
Crankshaft, Bearing Cap, Connecting Rod Bearing Cap, Crankshaft Damper Pulley, Flywheel, Oil Pan
Timing Pulley Housing, Timing Pulley, Timing Gear, Camshaft Oil Seal Retainer
Cooling System and Lubrication System
Intake Manifold, Exhaust Manifold, Exhaust Pipe
Engine Electricals
Engine Fuel
Engine Mounting Bracket
Special Tools
General Engine Mechanical Contents
Cylinder Head
Cylinder Head Disassembly
Cylinder Head Clean
Cylinder Head Inspection and Repair
Hot Plug Depression (4JG2 Only)
Combustion Chamber Inspection (4JG2 Only)
Hot Plug Inspection
Hot Plug Installation (4JG2 Only)
Hot Plug Removal (4JG2 Only)
Cylinder Head Reassembly
Heat Shield Installation (4JG2 Only)
Heat Shield Removal (4JG2 Only)
Valve Spring, Valve Guide Oil Seal, Valve Guide, Push Rod
Valve Spring, Valve Guide Oil Seal, Valve Guide, Push Rod Disassembly
Valve Guide
Valve Spring
Valve Spring, Valve Guide Oil Seal, Valve Guide, Push Rod Inspection and Repair
Valve Guide Replacement
Valve Thickness
Valve Contact Width
Valve Depression
Valve Seat Insert Replacement
Push Rod Curvature
Valve Seat Insert Correction
Valve Spring, Valve Guide Oil Seal, Valve Guide, Push Rod Reassembly
Camshaft, Tappet
Camshaft, Tappet Disassembly
Camshaft, Tappet Inspection and Repair
Camshaft Bearing Replacement
Tappet
Tappet Reassembly
Rocker Arm Assembly
Rocker Arm Disassembly
Rocker Arm Inspection and Repair
Rocker Arm Shaft Run-Out
Oil Pump
Oil Pump Disassembly
Oil Pump Inspection and Repair
Oil Pump Reassembly
Crankshaft
Crankshaft Disassembly
Crankshaft Inspection and Repair
Run-Out
Crankshaft Bearing Selection
Crankshaft Reassembly
Timing Belt
Crankshaft Damper Pulley
Injection Pump
Piston and Connecting Rod
Piston and Connecting Rod Disassembly
Piston and Connecting Rod Inspection and Repair
Piston and Piston Ring
Piston and Connecting Rod Reassembly
Cylinder Block
Cylinder Block Disassembly
Cylinder Block Inspection and Repair
Cylinder Liner Projection Inspection
Flatness
Cylinder Liner Bore Measurement
Cylinder Liner Grade Selection
Cylinder Body Bore Measurement
Cylinder Liner Installation
Cylinder Block Reassembly
4JB1/4JB1T/4JB1TC/4JG2-Engine Contents
General Description
Engine Mount (RH)
Engine Mount (RH) Removal
Engine Mount (RH) Installation
Engine Mount (LH)
Engine Mount (LH) Removal
Engine Mount (LH) Installation
Inlet Manifold
Inlet Manifold Removal
Inlet Manifold Installation
Exhaust Manifold
Exhaust Manifold Removal
Exhaust Manifold Installation
Oil Cooler
Oil Cooler Removal
Oil Cooler Inspection
Oil Cooler Installation
Oil Filter Cartridge
Oil Filter Cartridge Installation
Oil Filter Cartridge Removal
Cylinder Head Cover
Cylinder Head Cover Installation
Cylinder Head Cover Removal
Rocker Arm Shaft Assembly
Rocker Arm Shaft Installation
Rocker Arm Shaft Removal
Valvestem Oil Controller and Valve Spring
Valvestem Oil Controller and Valve Spring Removal
Valvestem Oil Controller and Valve Spring Installation
Timing Gear (4JB1, 4JB1TC, 4JG2 Gear Type)
Timing Gear (4JB1, 4JB1TC, 4JG2 Gear Type) Removal
Idler Gear "A" End Play Measurement
Timing Gear Backlash Measurement
Timing Gear (4JB1, 4JB1TC, 4JG2 Gear Type) Installation
Timing Belt (4JG2 Belt Type)
Timing Belt (4JG2 Belt Type) Removal
Timing Belt (4JG2 Belt Type) Installation
Cylinder Head and Gasket Removal
Cylinder Head Assembly and Gasket
Cylinder Head and Gasket Installation
Tension Adjustment
Oil Pan
Oil Pan Removal
Oil Pan Installation
Oil Pump Assembly
Oil Pump Removal
Oil Pump Installation
Piston, Piston Ring and Connecting Rod
Piston, Piston Ring and Connecting Rod Removal
Piston, Piston Ring and Connecting Rod Installation
Camshaft and Tappet
Camshaft and Tappet Removal
Camshaft and Tappet Installation
Crankshaft Front Oil Seal (Gear Drive Type)
Crankshaft Front Oil Seal (Gear Drive Type) Removal
Crankshaft Front Oil Seal (Gear Drive Type) Installation
Crankshaft Front Oil Seal (Belt Drive Type)
Crankshaft Front Oil Seal (Belt Drive Type) Removal
Crankshaft Front Oil Seal (Belt Drive Type) Installation
Crankshaft Rear Oil Seal (Gear & Belt Drive Type)
Crankshaft Rear Oil Seal (Gear & Belt Drive Type) Removal
Crankshaft Rear Oil Seal (Gear & Belt Drive Type) Installation
Flywheel and Pilot Bearing
Flywheel and Pilot Bearing Removal
Flywheel and Pilot Bearing Installation
Crankshaft and Main Bearings
Crankshaft and Main Bearings Removal
Crankshaft and Main Bearings Installation
Engine Assembly
Engine Removal
Engine Installation
Engine Cooling Contents
Engine Cooling General Description
Radiator
Thermostat
Water Pump
Anti-Freeze Solution
On-Vehicle Service
Water Pump Removal
Water Pump Inspection
Water Pump Installation
Thermostat Inspection
Thermostat Removal
Thermostat Installation
Radiator Removal
Radiator Inspection
Radiator Installation
Drive Belt Adjustment Inspection
Engine Fuel Contents
General Description
Fuel Flow
Injection Pump
Fuel Filter and Water Separator
Injection Nozzle
Fuel Filter Assembly
Fuel Filter Installation
Fuel Filter Removal
On-Vehicle Service
Fuel Filter Cartrige
Fuel Filter Cartrige Installation
Injection Nozzle Inspection
Injection Nozzle Removal
Injection Nozzle Disassembly (4JG2 Engine)
Injection Nozzle Inspection (4JG2 Engine)
Injection Nozzle Reassembly (4JG2 Engine)
Adjustment of Injection Opening Pressure (4JG2 Engine)
Oil Tight Test (4JG2 Engine)
Injection Nozzle Installation (4JG2 Engine)
Injection Nozzle (Two Spring Nozzle Holder) (4JB1-TC Only)
Injection Nozzle Disassembly
Only)
Reassembly and Adjustment Procedure
Reassembly and Opening Pressure Adjustment (4JB1-TC
Injection Nozzle Disassembly (4JBI/4JB1T Engine)
Injection Nozzle Inspection and Repair (4JB1/4JB1 T Engine)
Injection Nozzle Installation (4JB1/4JB1 T Engine)
Injection Pump Asm (4JB1/4JB1T, 4JG2 Gear Drive Type)
Injection Pump Asm (4JB1/4JB1T, 4JG2 Gear Drive Type) Removal
Injection Pump Assembly (Gear Drive Type)
Injection Pump Asm (4JB1/4JB1T, 4JG2 Gear Drive Type) Installation
Injection Pump Assembly (Belt Drive Type)
Injection Pump Assembly (4JG2 Belt Drive Type)
Injection Pump Assembly (4JG2 Belt Drive Type) Removal
Injection Pump Assembly (4JG2 Belt Drive Type) Installation
Injection Timing Adjustment
Adjustment of Idling Speed
Injection Pump Data
Test Conditions
Identification Plate and Number
Injection Volume and Governor Performance Diagram
Fuel Tank
Fuel Tank Removal
Fuel Tank Installation
Fuel Gauge Unit
Fuel Gauge Unit Installation
Fuel Gauge Unit Removal
Accelerator Control Cable
Accelerator Control Removal
Accelerator Control Inspection
Accelerator Control Installation
Accelerator Pedal
Accelerator Pedal Installation
Accelerator Pedal Removal
Idling Control Cable
Idling Control Cable Installation
Idling Control Cable Removal
Air Cleaner Element
Air Cleaner Element Removal
Air Cleaner Element Installation
Battery Contents
Engine Electrical Contents
Battery
Diagnosis
Fluid Level Check
General Description
Visual Inspection
Voltage Check
Load Test
Battery Charging
On-Vehicle Service
Jump Starting
Jump Starting with an Auxiliary (Booster) Battery
Jump Starting Procedure
Main Data and Specifications
Removal and Installation of Battery
Starting Circuit
Starting System Contents
Starting System Installation
Starting System Removal
Starting System Disassembly
Unit Repair
Armature
Starting System Inspection and Repair
Yoke
Bearing
Brush and Brush Holder
Overrunning Clutch
Starting System Reassembly
Magnetic Switch
Charging System Contents
Generator
Charging Circuit
General On-Vehicle Inspection
Generator Removal
Generator Installation
Generator Disassembly
Generator Inspection and Repair
Rotor
Stator Coil
Brush
Diode
IC Regulator
Vacuum Pump
Generator Reassembly
Charging System Disassembly
Charging System Inspection and Repair
Charging System Reassembly
Output Characteristic
QOSII Preheating System (4JB1/4JB1T/4JB1TC Only)
QOS II Timing Chart
System Diagram
Gow Plug
Inspection on QOSII System Operation Thermo Switch
QOSII System Troubleshooting
QOSIII Preheating System (4JG2 Only) Contents
QOS III Flow Chart
QOS III Block Chart
Inspection on QOSIII System Operation
Glow Plug
Thermo Sensor
Charge Relay
Dropping Resistor
Glow Plug Relay
Exhaust Gas Recirculation (EGR) System Contents
General Description
EGR System Operation
EGR System Wiring Diagram
Exhaust Gas Recirculation (EGR) System Check
EGR System Inspection
Engine Exhaust Contents
General Description
General Export
Model ’91/542B (Euro 2)
Three Way Catalytic Converter
Front Exhaust Pipe
Front Exhaust Pipe Removal
On-Vehicle Service
Exhaust Brake Unit Inspection
Front Exhaust Pipe Installation
Turbocharger Contents
Turbocharger Main Data and Specifications
General Description
Identification of Unit
Precautions
Turbocharger Servicing
Disassembly Steps
Turbocharger Disassembly
Turbocharger Inspection and Repair
Reassembly Steps
Turbocharger Reassembly
Ihi Service Network
Advertisement
Quick Links
Download this manual
WORKSHOP MANUAL
NHR • NKR • NPR
ENGINE
4J SERIES
SECTION 6
Table of
Contents
Previous
Page
Next
Page
1
2
3
4
5
Advertisement
Table of Contents
Troubleshooting
Troubleshooting Contents
6
QOSII System Troubleshooting
371
Need help?
Do you have a question about the NHR 4J Series and is the answer not in the manual?
Ask a question
Questions and answers
Subscribe to Our Youtube Channel
Related Manuals for Isuzu NHR 4J Series
Engine Isuzu NKR 4J Series Workshop Manual
(407 pages)
Engine Isuzu C22NE Workshop Manual
Isuzu gasoline engine c22ne, 22le, 20le (510 pages)
Engine Isuzu 20LE Workshop Manual
Isuzu gasoline engine c22ne, 22le, 20le (510 pages)
Engine Isuzu AU-4LE1T Maintenance Manual
(127 pages)
Engine Isuzu A-4JA1 Workshop Manual
Industrial diesel engine (232 pages)
Engine Isuzu 4BB1 Workshop Manual
4b-6b series (217 pages)
Engine Isuzu 3CH1-NGZG01 Introduction Manual
(114 pages)
Engine Isuzu 4JB1 Service Information
(61 pages)
Engine Isuzu c223 turbo Workshop Manual Supplement
(36 pages)
Engine Isuzu AA-6HK1T Workshop Manual
Industrial diesel engine (242 pages)
Engine Isuzu 4HK1-TC Manual
Mechanical features, control system & diagnosis (121 pages)
Engine Isuzu L Series Manual
(51 pages)
Engine Isuzu 4JA1 Workshop Manual
(564 pages)
Engine Isuzu 4LE2 Workshop Manual
Diesel engine (872 pages)
Engine Isuzu 4LE2 Owner's Manual
Tier 4/stage 3b (107 pages)
Engine Isuzu 2CA1 Workshop Manual
Industrial diesel engine (10 pages)
This manual is also suitable for:
Nkr 4j series
Table of Contents
Save PDF
Print
Rename the bookmark
Delete bookmark?
Delete from my manuals?
Login
Sign In
OR
Sign in with Facebook
Sign in with Google
Upload manual
Upload from disk
Upload from URL
Need help?
Do you have a question about the NHR 4J Series and is the answer not in the manual?
Questions and answers