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4JB1T
Isuzu 4JB1T User Manual
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00 – 26
SERVICE INF
ORM
A
TION
4) EXCESSIVE TURBOCHA
RGER NOISE
Checkpoi
nt
Trouble Cause
Countermeasure
Intak
e and exhaust
sy
stem join
ts
R
estrict
ed
Repair
Intak
e and exhaust system
gask
ets
Dam
aged
Replac
e
T
urbocharger r
otating parts
Rough r
otation
Replac
e
Rubbing agains
t housing
Repair
or replace
Dam
aged
Replac
e
Rubbing agains
t housing
Repair
or replace
Dam
aged
Replac
e
Continued on the nex
t page
OK
OK
OK
OK
NG
NG
NG
NG
NG
NG
NG
Com
pressor wheel
T
urbine wheel
Car
bon deposits
Clean or
replace
NG
23
25
Table of Contents
Hard Starting
1
Starter Inoperative
1
Starter Motor Operates but Engine Does Not Turn over
1
Engine Turns over but Does Not Start
2
Fuel Is Not Being Delivered to the Injection Pump
2
Fuel Is Being Delivered to the Injection Pump
2
Quick-On Start System
3
Glow Plugs Are Receiving Power
3
Glow Plugs Are Not Receiving Power
3
Unstable Idling
4
Insufficient Power
5
Excessive Fuel Consumption
7
Overheating
8
White Exhaust Smoke
8
Dark Exhaust Smoke
9
Oil Pressure Does Not Rise
9
Abnormal Engine Noise
10
Engine Knocking
10
Gas Leakage Noise
10
Continuous Noise
10
Slapping Noise
11
Engine Cooling Trouble
12
Engine Electrical Part Trouble
13
Turbocharger
18
Engine Has Less than Normal Power
18
Blue or Black Smoke
20
Excessive Oil Consumption
22
Excessive Turbocharger Noise
24
Excessive Rotating Part Wear
26
Lubrication Chart
27
4JB1, 4JB1TC, 4JG2, Oil Filter & Oil Cooler
27
Main Data and Specifications
28
Engine Cooling
30
Starting System
30
Charging System
31
Service Standard
32
Engine Mechanical
32
Servicing
36
Model Identification
36
Engine Serial Number
36
Air Cleaner
36
Lubricating System
37
Main Oil Filter (Cartridge Type Paper Element)
37
Replacement Procedure
37
Fuel System
38
Fuel Filter
38
Fuel Filter Water Draining Procedure
38
Air Bleeding
39
Cooling System
39
Coolant Level
39
Engine Coolant Change Procedure
39
Cooling System Inspection
41
Radiator Cap Inspection
41
Thermostat Operating Test
41
Drive Belt Adjustment
42
Cooling Fan Pulley Drive Belt
42
Compressor Pulley Drive Belt
42
Power Steering Oil Pump Pulley Drive Belt
42
Engine Control
43
Idling Speed Inspection and Adjustment
43
Accelerator Control Cable Adjustment
43
Accelerator Pedal Adjustment
43
Valve Clearance Adjustment
44
Injection Timing Adjustment
45
Compression Pressure Measurement
47
Quick-On Start II System (4JB1/4JB1T/4JB1TC Only)
47
Quick-On Start III System (4JG2 Only)
48
Fixing Torque
49
Cylinder Head Cover, Cylinder Head Rocker, Shaft Braker
49
Crankshaft, Bearing Cap, Connecting Rod Bearing Cap, Crankshaft Damper Pulley, Flywheel, Oil Pan
50
Timing Pulley Housing, Timing Pulley, Timing Gear, Camshaft Oil Seal Retainer
51
Cooling System and Lubrication System
52
Intake Manifold, Exhaust Manifold, Exhaust Pipe
53
Engine Electricals
55
Engine Fuel
56
Engine Mounting Bracket
57
Special Tools
58
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Isuzu 4JB1T Specifications
General
Displacement
2.8 L (2771 cc)
Bore x Stroke
93 mm x 102 mm
Fuel System
Direct Injection
Cooling System
Water-cooled
Aspiration
Turbocharged
Weight
Approx. 230 kg (dry)
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