section 8 ISUZU TF SERIES 2004 Workshop Manual

TROUBLESHOOTING 6 – 1


SECTION 6
TROUBLESHOOTING


TABLE OF CONTENTS
PAGE PAGE
BASIC INSPECTION PROCEDURE ... 6– 2

1. HARD STARTING ........................... 6– 3

1-1.Starter Motor Inoperative ......... 6– 3

1-2. Starter Motor Operates But
Engine Does Not Turn Over .......... 6– 3

1-3. Engine Turns Over But Does
Not Start Engine ............................. 6– 4

2. UNSTABLE IDLING ........................ 6– 5

3. INSUFFICIENT POWER ................. 6– 6

4. EXCESSIVE FUEL
CONSUMPTION ................................. 6– 7

5. EXCESSIVE OIL CONSUMPTION.. 6– 8

6. OVERHEATING............................... 6– 9

7. WHITE EXHAUST SMOKE ............. 6– 9

8. DARK EXHAUST SMOKE .............. 6– 10

9. OIL PRESSURE DOES NOT RISE . 6– 11

10. ABNORMAL ENGINE NOISE ....... 6– 12

10-1. Engine Knocking.................... 6– 12

10-2. Gas Leakage Noise ................ 6– 12

10-3. Continuous Noise .................. 6– 13

10-4. Slapping Noise ....................... 6– 13

10-5. Excessive Turbocharger
Noise ............................................... 6– 14
11. ROTATING PART WEAR OF
TURBOCHARGER ............................. 6– 14

12. OIL LEAKAGE FROM
TURBOCHRGER ............................... 6– 15

13. INSUFFICIENT ACCELERATION
AND/OR LACK OF POWER DUE
TO TURBOCHARGER ....................... 6– 15

14. BATTERY CHARGING AND
NOISE PROBLEM.............................. 6– 16

14-1. Battery No Charging .............. 6– 16

14-2. Battery Overcharging ............ 6– 16

14-3. Battery Under Charging......... 6– 17

14-4. Battery Unstable Charging
Current ............................................ 6– 17

14-5. Charging System Noise ......... 6– 18

15. STARTER MOTOR PROBLEM..... 6– 19

15-1. Starter Motor Pinion Engages
to Ring Gear But Engine Does
Not Turn Over ................................. 6– 19

15-2. Incorrect Pinion And Ring
Gear Engagement .......................... 6– 19

15-3. Starter Motor Continues To
Run After The Starter Switch Is
Turned Off ....................................... 6– 20

15-4. Excessive Commutator
Sparking .......................................... 6– 20

6 – 2 TROUBLESHOOTING
Basic Inspection Procedure
Follow the under inspection procedure, when the problem vehicle comes workshop.
Step Inspection point Inspection result YES NO
1 Check the check engine lamp Is the check engine lamp turn
ON ? Go to section
6E “On Board
Diagnostic
(OBD) System
Check" Go to Step 2
2 The battery fluid level and the
gravity Was the problem found? Re-charge the
battery or
replace the
battery Go to Step 3
3 The engine coolant capacity Was the problem found? Replenish the
engine coolant Go to Step 4
4 The engine oil level Was the problem found? Replenish the
engine oil Go to Step 5
5 The air cleaner element Was the problem found? Clean or
replace Go to Step 6
6 The piping fixing condition (oil,
vacuum and fuel piping) Was the problem found? Return normal
condition Go to Step 7
7 The drive belt tension and break Was the problem found? Re-adjust the
tension or
replace Go to Step 8
8 Go to section 6E “On Board
Diagnostic (OBD) System
Check” Was the problem found?
Verify repair Go to Step 9
9 Go to mechanical
troubleshooting chart Was the problem found?
Verify repair —

ENGINE MECHANICAL 6A – 1


SECTION 6A
ENGINE MECHANICAL


TABLE OF CONTENTS
PAGE
Main Data and Specifications ....................................................................................... 6A - 4
Torque Specifications ................................................................................................... 6A - 8
Standard Bolts ........................................................................................................... 6A - 8
Special Parts Fixing Nuts and Bolts ........................................................................ 6A - 9
Recommended Liquid Gasket ...................................................................................... 6A - 22
LOCTITE Application Procedure .................................................................................. 6A - 23
Servicing......................................................................................................................... 6A - 24
Model Identification ................................................................................................... 6A - 24
Air Cleaner .................................................................................................................. 6A - 24
Lubricating System .................................................................................................... 6A - 24
Fuel System ................................................................................................................ 6A - 25
Cooling System .......................................................................................................... 6A - 27
Valve Clearance Adjustment ..................................................................................... 6A - 31
Compression Pressure Measurement ...................................................................... 6A - 32
General Description....................................................................................................... 6A- 36
Removal and Installation............................................................................................... 6A- 37
Removal ...................................................................................................................... 6A- 37
Installation .................................................................................................................. 6A- 40
Coolant Replenishment.......................................................................................... 6A- 41
Engine Warm-Up..................................................................................................... 6A- 41
Engine Repair Kit ........................................................................................................... 6A- 42
Engine Overhaul ............................................................................................................ 6A- 43
Removal ...................................................................................................................... 6A- 43
External Parts ......................................................................................................... 6A- 43

ENGINE MECHANICAL 6A – 37

REMOVAL AND INSTALLATION
Read this section carefully before performing any removal and installation procedure. This section gives
you important points as well as the order of operation. Be sure that you understand everything in this section before
you begin.


Removal

P1010011
1. Battery
1) Disconnect the battery cable and the grounding cable from the battery terminals.
2) Remove the battery clamp. Take care not to accidentally short the battery with the wrench or some
other tool.
3) Remove the battery.
4) Disconnect the battery cable at the starter motor and the ground cable at the cylinder body.



2. Engine Hood Apply setting marks to the engine hood and the engine
hood hinges before removing the engine hood. This will
facilitate reinstallation of the engine hood to its original
position.



3. Supporting the Vehicle 1) Jack up the vehicle.
2) Place chassis stands at the front and the rear of the vehicle.


4. Under cover (for 4x4 model) 5. Rear propeller shaft 1) Remove the propeller shaft flange yoke at the rear differential.
2) Remove the center bearing retainer bolts.
3) Remove the propeller shaft together with the center bearing from the transmission mainshaft spline.


F06R300006 P1010002

6A – 86 ENGINE MECHANICAL





Ring Gear Replacement
Ring Gear Removal
Strike around the edges of the ring gear with a hammer and
chisel to remove it.




Ring Gear Installation
1. Heat the ring gear evenly with a gas burner to invite
thermal expansion.
Do not allow the temperature of the gas burner to exceed
200
C (390
F).
2. Install the ring gear when it is sufficiently heated.
The ring gear must be installed with the chamfer facing the
clutch.






PISTON
Piston Grade Selection and Cylinder Bore
Measurement
Refer to the Section "Cylinder Body", Item "Cylinder Liner Bore
Measurement" for details on piston grade selection and
cylinder liner bore measurement.





Piston Ring Gap
1. Insert the piston ring horizontally (in the position it would
assume if it were installed to the piston) into the cylinder
liner.




2. Push the piston ring into the cylinder bore until it reaches
the measuring point 1 or 2 where the cylinder liner bore is
the smallest.
Do not allow the piston ring to slant to one side or the
other. It must be perfectly horizontal.
Measuring Point 1 10 mm (0.4 in)
or
Measuring Point 2 120 mm (4.7 in)



020LX008
020LX009
015LX023
015RY00020

6A – 92 ENGINE MECHANICAL

















Oil Seal Installation
Use the special tool to install the front oil seal.
Front Oil Seal Installer: 5-8840-2361-0
1. With the oil seal attached to the sleeve, insert it into the
front end section of the crankshaft.
2. With the oil seal end section attached securely to the
crankshaft, tighten up the center bolt until the sleeve hits
the front end reference plane of the crankshaft securely.
3. Remove the sleeve.
4. With the seal pressed in, check the dimension of the oil
seal section.
Standard Dimension = 1.0  0.03mm

NOTE:
Install the oil seal after assembling the timing pulley
housing. The oil seal lip section is applied with oil.
Take notice of the press-in direction of the oil seal.

020R300005

ENGINE MECHANICAL 6A – 117


RTW46ASH001201
33. Injection Nozzle Holder
1. Install the injection nozzle gasket and the O-ring to the
injection nozzle holder.
Be sure that the O-ring fits snugly in the injection
nozzle groove.
2. Install the nozzle holder toghther with the nozzle holder
bracket to the cylinder head.










3. Tighten the nozzle holder bracket bolt to the specified
torque.


Injection Nozzle Holder Bracket Bolt
Torque N·m(kg·m/lbft)
37 (3.8/28)













Note on Valve Clearance Adjustment
Valve clearances must be adjusted before the cylinder
head cover is reinstalled.Refer to "Valve Clearance
Adjustment" in the "Servicing" Section of this manual.


Valve Clearance (At Cold) mm(in)
0.4 (0.0157)


RTW46ASH001101















34. Cylinder Head Cover
1. Apply engine oil to the rocker arm and the valve spring.
2. Install the cylinder head cover gasket to the head
cover. Check to see that the head cover gasket has no
loose areas.
3. Tighten the cylinder head cover nuts in the numerical
order shown in the illustration.


Cylinder Head Cover Bolt Torque N·m(kg·m/lbft)
13 (1.3/9.4)
4. Connect the positive crankcase ventilation (PCV) hose
to the cylinder head cover.




014RY00015

ENGINE MECHANICAL 6A – 123




15. Starter Motor
Tighten the starter motor bolts to the specified torque.
Starter Motor Bolt Torque N·m(kg·m/Ib ft)
85 (8.7/63)

16. Injection Pump
17. Injection Pump Cover (4JA1TC/4JH1TC only)


18. Engine Foot
Install the engine foot to the cylinder body and tighten the
bracket bolts to the specified torque.
Engine Foot Bolt Torque N·m(kg·m/Ib ft)
Right Side M10
1.25
40 (4.1/30)
M10
1.25
40 (4.1/30) Left Side
M14
1.50
127 (13/93)









4JA1L, 4JH1TC
022R300003
















4JA1TC
RTW46ASH002601







RTW36ASH001001
















19. Intake Manifold
1) Install the manifold gasket to the intake manifold.
2) Connect the intake rubber hose to the intake duct.
3) Tighten the intake manifold bolts and the flange nuts
to the specified torque.
Intake Manifold Bolt Torque N·m(kg·m/Ib ft)
19 (1.9/14)

Intake Manifold Flange Nut Torque N·m(kg·m/Ib ft)
24 (2.4/18)

4) Connect the PCV hose to the cylinder head cover.

5) Install the fan drive belt and adjust the belt tension
referring SERVICING of this section

6A – 136 ENGINE MECHANICAL





RTW36ASH000601
Removal
1. Radiator Grille

Refer to removal procedure in Sheet Metal section.







RTW36ASH000501
2. Front Bumper Fascia

Remove the nine clips and four screws.

Disconnect the fog light harness connectors.
















RTW46ASH002101
3. Front Bumper Impact Support Assembly

Remove the nut and two bolts.



4. Inter Cooler

Remove the nut and two bolts.

Disconnect the air hose.




Installation
4. Inter Cooler

Tighten the nut and two bolts.


3. Front Bumper Impact Support Assembly

Tighten the nut and two bolts.



2. Front Bumper Fascia

Install the nine clips and four screws.

Connect the fog light harness connectors.


1. Radiator grille

Refer to installation procedure in Sheet Metal section.

ENGINE COOLING 6B – 1


SECTION 6B
ENGINE COOLING


TABLE OF CONTENTS
PAGE
Main Data and Specifications ....................................................................................... 6B - 3
General Description .................................................................................................. 6B - 4
Coolant Flow .............................................................................................................. 6B - 4
Water Pump................................................................................................................ 6B - 5
Thermostat ................................................................................................................. 6B - 5
Radiator ...................................................................................................................... 6B - 6
Diagnosis........................................................................................................................ 6B - 7
Draining and Refilling Cooling System ........................................................................ 6B - 8
Water Pump .................................................................................................................... 6B - 10
Removal and Installation .......................................................................................... 6B - 10
Removal...................................................................................................................... 6B - 10
Inspection and Repair ............................................................................................... 6B - 11
Installation.................................................................................................................. 6B - 11
Thermostat ..................................................................................................................... 6B - 13
Removal and Installation .......................................................................................... 6B - 13
Removal...................................................................................................................... 6B - 13
Inspection and Repair ............................................................................................... 6B - 13
Installation.................................................................................................................. 6B - 14
Radiator .......................................................................................................................... 6B - 15
Removal and Installation .......................................................................................... 6B - 15
Radiator and Associated Parts................................................................................. 6B - 15
Removal...................................................................................................................... 6B - 16
Inspection and Repair ............................................................................................... 6B - 17
Installation.................................................................................................................. 6B - 18