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Isuzu 4JG2 - User Manual

Isuzu 4JG2
60 pages
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SERVICE INFORM
ATION 00 – 3
1.
HARD STARTING
1. STARTER INOPERATIVE
Checkpoint Possible cause Correction
Loos
e battery cable terminal poor
connections due to rusting
Clean and/or retighten the battery
cable terminal
Batter
y discharged or weak Recharge or replace the battery
Battery
F
an belt loose or broken Adjust or replace the fan belt
F
usible link Fusible link shorted Replace the fusible link
Star
ter switch Defective starter switch or starter relay Replace the starter switch or the
Starter relay
Def
ective magnetic switch or starter relay Repair or replace the magnetic switch
Starter m
otor
Defective starter motor Repair or replace the starter motor
2. STARTER MOTOR OPERATES BUT ENGINE DOES NOT TURN OVER
Loos
e battery cable terminal Clean and/or retighten the battery
cable terminal
Poor
connections due to rusting Recharge or replace the battery
Batter
y discharged or weak Recharge or replace the battery
Battery
F
an belt loose or broken Adjust or replace the fan belt
Def
ective pinion gear Replace the pinion gear
Def
ective magnetic switch Repair or replace the magnetic switch
Star
ter
Brush wear, Weak brush spring Replace the brush and/or the brush
spring
Engine
Piston, crank bearing seizure, or other
damage
Repair or replace the related parts

Table of Contents

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Isuzu 4JG2 Specifications

General IconGeneral
Fuel SystemIndirect injection
Cooling SystemWater-cooled
Fuel TypeDiesel
Displacement3.059 L (3059 cc)
Bore x Stroke95.4 mm x 107 mm
Torque Output2000 rpm
ValvetrainOverhead valve (OHV)

Summary

1. HARD STARTING

1. STARTER INOPERATIVE

Troubleshooting starter system failure.

2. STARTER MOTOR OPERATES BUT ENGINE DOES NOT TURN OVER

Troubleshooting starter operation without engine turnover.

3. ENGINE TURNS OVER BUT DOES NOT START

4. QUICK-ON START SYSTEM

2. UNSTABLE IDLING

3. INSUFFICIENT POWER

6. OVERHEATING

7. WHITE EXHAUST SMOKE

8. DARK EXHAUST SMOKE

9. OIL PRESSURE DOES NOT RISE

10. ABNORMAL ENGINE NOISE

1. ENGINE KNOCKING

Diagnosing engine knocking noises.

2. GAS LEAKAGE NOISE

Troubleshooting noise from gas leaks.

4. SLAPPING NOISE

11. ENGINE COOLING TROUBLE

12. ENGINE ELECTRICAL PART TROUBLE

13. TURBOCHARGER

Drive Belt Adjustment

ENGINE CONTROL

VALVE CLEARANCE ADJUSTMENT

INJECTION TIMING ADJUSTMENT

COMPRESSION PRESSURE MEASUREMENT

QUICK-ON START II SYSTEM

QUICK-ON START III SYSTEM

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