2004 ISUZU TF SERIES cooling

6B – 18 ENGINE COOLING




110RS005

 Check the rubber hoses for swelling.

Installation
1. Install radiator assembly (9) with hose, taking care not to
damage the radiator core with a fan blade.
2. Support the radiator upper tank with the bracket (5) and
secure the radiator.
3. Connect reserve tank hose (6).
4. Install lower fan guide (3).
5. Connect radiator inlet hose and outlet hose (1) to the
engine.





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6. Connect oil cooler hose to automatic transmission.
7. Connect battery ground cable.

ENGINE COOLING 6B – 19




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8. Pour engine coolant up to filler neck of radiator, and up to
MAX mark of reserve tank.

Important operation (in case of 100% engine coolant
change) procedure for filling with engine coolant.


Engine coolant change
Refer to 6B-8 (Draining and Refilling Cooling System).

6B – 20 ENGINE COOLING
FAN CLUTCH WITH COOLING FAN
INSPECTION AND REPAIR
Make necessary correction or parts replacement if wear, damage or any other abnormal condition are found through
inspection.


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Visually inspect for damage, leak (sillicon grease) or other
abnormal conditions.
1. Inspection (on-vehicle)
1) Turn the fan clutch by hand when in a low temperature
condition before starting the engine, and confirm that it
can be turned readily.
2) Start the engine to warm it up until the temperature at
the fan clutch portion gets to around 80
C. Then stop
the engine and confirm that the fan clutch can be
turned with considerable effort (clutch torque) when
turned by hand.
If the fan clutch rotates more readily, however, this
indicates that the silicone grease is leaking internally.
Replace the fan clutch with a new one.



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2. Inspection (in unit)
Warm up the bimetal of the fan clutch by using the heat
gun until the temperature gets to about 80
C when
measured with the thermistor. Then confirm that the fan
clutch can be turned with considerable effort (clutch
torque).
If the fan clutch retates more readily at this time, this
indicates that the silicone grease is leaking internally.
Replace the fan clutch with a new one.

ENGINE ELECTRICAL 6D – 7
GENERATOR
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.


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Important Operations-Removal
Cooling Fan Belt
1. Disconnect the battery cables at the battery terminals.
2. Loosen and remove the fan belt adjusting plate bolts.
3. Remove the fan belt from the generator drive pulley.


Generator
1. Remove the vacuum pump hose.
2. Remove the generator bolt and the generator from the bracket.



Important Operations-Installation
Follow the removal procedure in the reverse order to
perform the installation procedure. Pay careful attention to
the important points during the installation procedure.



Generator
1. Install the generator to the bracket.
2. Tighten the generator bolt to the specified torque.
3. Install the vacuum pump hose.
Generator Bolt Torque N
m (kg
m/Ib
ft)
40 (4.1/30)

6D – 8 ENGINE ELECTRICAL

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Cooling Fan Drive Belt
1. Hold the generator toward the engine.
2. Install the fan belt to the three pulleys.
1 Crankshaft pulley
2 Generator pulley
3 Cooling fan drive pulley



3. Adjust the fan belt tension
Fan belt tension is adjusted by moving the generator.
Depress the drive belt mid-portion with a 98N (10
kg/22 Ib) force.
Cooling Fan Drive Belt Deflection mm (in)
New belt 4 - 7 (0.16 - 0.28)
Reuse belt 6 - 9 (0.24 - 0.35)


4. Tighten the adjusting plate bolts to the specified
torque.

Adjusting Plate Bolt N·m (kg·m/lb·ft)
19 (1.9/14)

5. Reconnect the battery cable to the battery.

6E–402 4JA1/4JH1 ENGINE DRIVEABILITY AND EMISSIONS
POOR FUEL ECONOMY SYMPTOM
DEFINITIONS: Fuel economy, as measured by an actual road test, is noticeably lower than expected. Also, economy
is noticeably lower than it was on this vehicle at one time, as previously shown by an actual road test. (Larger than
standard tires will cause odometer readings to be incorrect, and that may cause fuel economy to appear poor when it
is actually normal.)
Step Action Value(s) Yes No
1Was the “On-Board Diagnostic (OBD) System Check”
performed?
—Go to Step 2Go to On Board
Diagnostic
(OBD) System
Check
2 1. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?—Verify repair Go to Step 3
3 Was a visually/physical check performed?
—Go to Step 4Go to Visual /
physical Check
4 Check owner's driving habits.
Is the A/C “On” full time?
Are tires at the correct pressure?
Are ex cessively heavy loads being carried?
Is acceleration too much, too often?—Go to Step 5Go to Step 6
5 Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?—System OK—
6 Check for low engine coolant level.
Was a problem found? —Verify repair Go to Step 7
7 Check for incorrect or faulty engine thermostat. Refer
to Engine Cooling.
Was a problem found?—Verify repair Go to Step 8
8 Check for proper calibration of the speedometer.
Does the speed indicated on the speed meter closely
match the vehicle speed displayed on the Tech 2?—Go to Step 10Go to Step 9
9 Diagnose and repair the inaccurate speedometer
condition as necessary. Refer to Vehicle Speed
Sensor in Electrical Diagnosis.—Veri fy repai r—
10 Check for proper calibration of the fuel gauge.
Was a problem found? —Verify repair Go to Step 11
11 Check the torque converter clutch (TCC) for proper
operation (if A/T model). If a problem is found, repair
as necessary.
Was a problem found?—Verify repair Go to Step 12
12 1. Using the Tech 2, ignition “On” and engine “Off”.
2. Monitor the “Neutral Switch” in the data display.
Does the Tech 2 indicate correct “Neutral Switch”
status depending on any shift positions?
If a problem is found, repair as necessary.
Was the problem found?—Verify repair Go to Step 13

ENGINE MECHANICAL (6VE1 3.5L) 6A-1
ENGINE
CONTENTS
Engine Mechanical.................................................6A
Engine Cooling........................................................6B
Engine Fuel.............................................................6C
Engine Electrical.....................................................6D1
Ignition System.......................................................6D2
Starting and Changing System.............................6D3 Driveability and Emissions.....................................6E
Engine Exhaust.......................................................6F
Engine Lubrication..................................................6G
Engine Speed Control System..............................6H
Induction...................................................................6J


ENGINE MECHANICAL (6VE1 3.5L)
CONTENTS

Service Precaution................................................. 6A-2
General Description............................................... 6A-3
Engine Diagnosis.................................................... 6A-4
Cylinder Head Cover LH........................................ 6A-21
Removal............................................................... 6A-21
Installation............................................................ 6A-21
Cylinder Head Cover RH....................................... 6A-23
Removal............................................................... 6A-23
Installation............................................................ 6A-23
Common Chamber................................................. 6A-24
Removal............................................................... 6A-24
Installation............................................................ 6A-25
Exhaust Manifold LH.............................................. 6A-26
Removal............................................................... 6A-26
Installation............................................................ 6A-26
Exhaust Manifold RH............................................. 6A-27
Removal............................................................... 6A-27
Installation............................................................ 6A-27
Crankshaft Pulley................................................... 6A-28
Removal............................................................... 6A-28
Installation............................................................ 6A-28
Timing Belt.............................................................. 6A-29
Removal............................................................... 6A-29
Installation............................................................ 6A-30
Camshaft................................................................. 6A-34
Removal............................................................... 6A-34
Installation............................................................ 6A-34
Cylinder Head......................................................... 6A-37
Removal............................................................... 6A-37
Installation............................................................ 6A-37
Valve Stem Oil Controller , Valve Spring
and Valve Guide.................................................... 6A-39
Removal................................................................ 6A-39
Installation............................................................. 6A-39
Piston, Piston Ring and Connecting Rod............ 6A-40
Removal................................................................ 6A-40
Installation............................................................. 6A-41
Crankshaft and Main Bearings.............................. 6A-43
Removal................................................................ 6A-43
Installation............................................................. 6A-44
Rear Oil Seal........................................................... 6A-48
Removal................................................................ 6A-48
Installation............................................................. 6A-48
Engine Assembly.................................................... 6A-49
Removal................................................................ 6A-49
Installation............................................................. 6A-49
Cylinder Head.......................................................... 6A-52
Cylinder Head and Associated Parts................ 6A-52
Disassembly......................................................... 6A-53
Clean..................................................................... 6A-53
Inspection and Repair......................................... 6A-53
Reassembly.......................................................... 6A-54
Valve Spring, Oil Controller, Valve, Valve
Guide....................................................................... 6A-56
Valve Spring, Oil Controller, Valve, Valve
Guide and Associated Parts............................. 6A-56
Disassembly......................................................... 6A-57
Inspection and Repair......................................... 6A-57
Reassembly.......................................................... 6A-61
Camshaft.................................................................. 6A-64
Camshaft and Associated Parts........................ 6A-64
Disassembly......................................................... 6A-64
Inspection and Repair......................................... 6A-65
Reassembly.......................................................... 6A-67

ENGINE MECHANICAL (6VE1 3.5L) 6A-11
Symptom Possible Cause Action
Engine overheating Level of Engine Coolant too low Replenish
Fan clutch defective Replace
Thermostat defective Replace
Engine Coolant pump defective Correct or replace
Radiator clogged Clean or replace
Radiator filler cap defective Replace
Level of oil in engine crankcase too
low or wrong engine oil Change or replenish
Resistance in exhaust system
increased Clean exhaust system or replace
defective parts
Throttle Position Sensor adjustment
incorrect Replace with Throttle Valve ASM
Throttle Position Sensor circuit open
or shorted Correct or replace
Cylinder head gasket damaged Replace
Engine overcooling Thermostat defective Replace (Use a thermostat set to
open at 82
C (180
F))
Engine lacks compression ———— Refer to Hard Start
Others Tire inflation pressure abnormal Adjust to recommended pressures
Brake drag Adjust
Clutch slipping Adjust or replace
Level of oil in engine crankcase too
high Correct level of engine oil
EGR valve defective Replace