radiator ISUZU KB P190 2007 Workshop Owners Manual

6A-66 ENGINE MECHANICAL (C24SE)

Installation
Follow the removal procedure in the reverse order to install the
radiator.



Thermostat
Removal
1. Remove water outlet nozzles with thermostat from thermostat housing.
2. Remove coolant hose and collect coolant.







Important!
Remove and Install thermostat only together with water outlet
nozzles.

Tighten (Torque)
W ater outlet nozzles to thermostat housing - 8 N ⋅m (0.8 kgf ⋅m)

Installation
1. Install coolant hose.
2. Fill cooling system and bleed according to the corresponding operation.











Water Pump
Removal
1. Remove lower hose band from pipe band and collect coolant.
2. Remove front toothed belt cover according to the corresponding operation.
3. Remove water pump from cylinder block after releasing tension on toothed belt.

Clean
Sealing surfaces


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6A-78 ENGINE MECHANICAL (C24SE)
Cooling System
Radiator

Type: Cross-flow

Radiator core surface in cm
2: 2000

Cooling system capacity (in litres): 8


Anti-freeze Mixture
Anti-freeze Mixture

Required
Quantity Up to-10
°
°°
°
C
Quantity in litres Up to-20
°
°°
°
C
Quantity in litres Up to-30
°
°°
°
C
Quantity in litres Up to-40
°
°°
°
C
Quantity of litres
(in litres) Water (80%) An ti -
Freeze (20%) Water
(66%) An ti -
Freeze (34%) Water
(56%) An ti -
Freeze (44%) Water
(48%) An ti -
Freeze (52%)
7.2 5.7 1.5 4.7 2.5 4.0 3.2 3.4 3.8


Cooling System (continued)
Fan

Type Visco Clutch Fan
Number of blades 5
Distribution of blades asymmetric
Diameter mm


Radiator cap

Boiling point 123°C
Opening pressure kPa (bar) 120 to 135 (1.20 to 1.35)


Thermostat

Start of opening 92°C
Fully opened 107°C
Type Bypassed


Idle Speeds, CO Content, Ignition
Adjustment

Applicable System Idle speed in min-1 (rpm)
Manual CO content
in vol. % Ignition timing in CA BTDC (adjustment
ensues at able speed,
ignition marks must align) with TDC sensor measuring instrument:
Closed Loop System 825 *<0.4 *** 8 to 12
Open Loop System 825
**1.0+0.2
-0.5 *** 8 to 12
Note) * CO content adjustment not applicable.
** CO content adjustment refer to Section 6E1 (W /O catalytic converter system)
*** Ignition timing adjustment not possible.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE COOLING 6B-1
SECTION 6B
ENGINE COOLING
TABLE OF CONTENTS
PAGE
General Description ....................................................................................................... 6B- 2
Service Precaution ......................................................................................................... 6B- 3
Diagnosis ...................................................................................................................... .. 6B- 5
Draining and Refilling Cooling System ........................................................................ 6B- 6
Water Pump .................................................................................................................... 6B- 7
Water Pump and Associated Parts .......................................................................... 6B- 7
Removal ...................................................................................................................... 6 B- 7
Inspection ................................................................................................................... 6 B- 7
Installation .................................................................................................................. 6B- 8
Thermostat ..................................................................................................................... . 6B- 9
Removal ...................................................................................................................... 6 B- 9
Inspection ................................................................................................................... 6 B- 9
Installation .................................................................................................................. 6B- 9
Fan clutch with Cooling Fan.......................................................................................... 6B- 9 Inspection and Repair ............................................................................................... 6B- 9
Radiator ....................................................................................................................... .... 6B-11
Radiator and Associated Parts ................................................................................. 6B-11
Removal ...................................................................................................................... 6 B-11
Inspection ................................................................................................................... 6 B-12
Installation .................................................................................................................. 6B-13
Main Data and Specifications ........................................................................................ 6B-13
Special Service Tool....................................................................................................... 6B- 14


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6B-2 ENGINE COOLING
General Description
Legend
1 W ater Pump
2 Thermostat
3 Radiator
4 Reserve Tank 5 Coolant Distributor
6 Cylinder Block and Head
7 Throttle Body
8 Heater




The Cooling System is a pressurized type, where the water
pump, which is cambelt driven, forces the circulation of
the coolant through the cylinder block and head. The
thermostat regulates the flow of coolant between the
radiator and the bypass circuit. The heater is part of the
bypass circuit. The throttle body pre-heat is a separate
circuit which is not regulated by the thermostat. An oil
cooler may be fitted as part of this circuit.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE COOLING 6B-3


Service Precaution
CAUTION:
Always use the correct fastener in the proper location.
When you replace a fastener, use ONLY the exact part
number for that application. ISUZU will call out those
fasteners that require a replacement after removal. ISUZU
will also call out the fasteners that require thread lockers
or thread sealant. UNLESS OTHERWISE SPECIFIED, do
not use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or fastener
joint interfaces. Generally, such coatings adversely affect
the fastener torque and the joint clamping force, and may
damage the fastener. When you install fasteners, use the
correct tightening sequence and specifications. Following
these instructions can help you avoid damage to parts
and systems.



Water pump
The water pump is centrifugal type and is driven by timing belt.


Thermostat
The thermostat is a bypass type and is a wax pellet type with a
air hole.





110RS001
Radiator
The radiator is a flow type with corrugated fins.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE COOLING 6B-5
Diagnosis
Engine Cooling Trouble
Condition Possible cause Correction
Engine overheating Low Engine Coolant level Replenish
Thermo mater unit faulty Replace
Faulty thermostat Replace
Faulty Engine Coolant temperature
sensor Repair or replace

Clogged radiator Clean or replace
Faulty radiator cap Replace
Low engine oil level or use of
improper engine oil Replenish or change oil

Clogged exhaust system Clean exhaust system or replace
faulty parts
Faulty Throttle Position sensor Replace throttle valve assembly
Open or shorted Throttle Position
sensor circuit Repair or replace

Damaged cylinder head gasket Replace
Loosen V-belt tension Adjust belt tension or replace.
Collapsed hoses Replace
Faulty Fan clutch Replace
Engine overcooling Faulty thermostat Replace
Engine slow to warm-up Faulty thermostat Replace
Thermo unit faulty Replace


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6B-6 ENGINE COOLING

















Draining and Refilling Cooling
System
Before draining the cooling system, inspect the system and
perform any necessary service to ensure that it is clean, does
not leak and is in proper working order. The engine coolant
level should be between the "MIN" and "MAX" lines of reserve
tank when the engine is cold. If low, check for leakage and add
engine coolant up to the "MAX" line. There should not be any
excessive deposit of rust or scales around the radiator cap or
radiator filler hole, and the engine coolant should also be free
from oil.
Replace the engine coolant if excessively dirty.
1. Completely drain the cooling system by opening the drain
plug at the bottom of the radiator.
2. Remove the radiator cap.
WARNING: TO AVOID THE DANGER OF BEING BURNED,
DO NOT REMOVE THE CAP WHILE THE ENGINE AND
RADIATOR ARE STILL HOT. SCALDING FLUID AND
STEAM CAN BE BLOWN OUT UNDER PRESSURE.
3. Disconnect all hoses from the engine coolant reserve tank.
Scrub and clean the inside of the reserve tank with soap and water. Flush it well with clean water, then drain it. Install
the reserve tank and hoses.
4. Refill the cooling system with the engine coolant using a solution that is at least 50 percent antifreeze.
5. Fill the radiator to the base of the filler neck.
Fill the engine coolant reserve tank to "MAX" line when the engine is cold.
6. Block the drive wheels and firmly apply the parking brake and place the shift lever in the "NEUTRAL" position.
7. Remove the radiator cap. Start the engine and warm it up at 2,500 - 3,000 rpm for about 30 minutes.
8. W hen the air comes out from the radiator filler neck and the engine coolant level has gone down, replenish with the
engine coolant. Repeat this procedure until the engine
coolant level does not go down. Then stop the engine and
install the radiator cap. Let the engine cool down.
9. After the engine has cooled, replenish with engine coolant up to the "MAX" line of the reserve tank.
10. Start the engine. W ith the engine running at 3,000 rpm, make sure there is no running water sound from the heate
r
core (behind the center console).
11. If the running water sound is heard, repeat steps 8 to 10.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE COOLING 6B-7
Water Pump
Water Pump and Associated Parts








Legend
1 Water Pump Assembly 2 O-Ring
3 Bolt

2
3 1

















Removal
1. Disconnect battery ground cable.
2. Drain coolant.
3. Disconnect radiator hose (on inlet pipe side).
4. Remove timing belt, refer to "Timing Belt" in this manual.
5. Remove water pump assembly.
Inspection
Make necessary repair and parts replacement if extreme wear
or damage is found during inspection. Should any of the
following problems occur, the entire water pump assembly
must be replaced:

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6B-8 ENGINE COOLING










•
Crack in the water pump body
• EC leakage from the seal unit
• Play or abnormal noise in the bearing
• Cracks or corrosion in the impeller
Installation
1. Before installing water pump, coat sealing surface with
silicon grease.
2. Install water pump assembly and tighten bolts to the specified torque.
Torque: 25 N ⋅
⋅⋅
⋅
m (2.5 kgf ⋅
⋅⋅
⋅
m)
3. Timing belt • Install timing belt, refer to timing belt installation step in
"Timing Belt" in this manual.
4. Connect radiator hose and replenish EC.
5. Connect battery ground cable.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

ENGINE COOLING 6B-9
Thermostat





























Removal
1. Disconnect battery ground cable.
2. Drain engine coolant from the radiator and engine.
3. Disconnect radiator hose from the inlet pipe.
4. Remove thermostat housing.
5. Remove thermostat from thermostat housing.
Inspection
Suspend the thermostat in a water-filled container using thin
wire. Place a thermometer next to the thermostat.
Do not directly heat the thermostat.
Gradually increase the water temperature. Stir the water so
that the entire water is same temperature.
Confirm the temperature when the valve first begins to open.
Valve opening temperature 92 °
°°
°
C (197.6 °
°°
°
F)
Confirm the temperature when the valve is fully opened.
Valve full open temperature 107 °
°°
°
C(224.6 °
°°
°
F)
Make necessary repair and parts replacement if extreme wear
or damage is found during inspection.
Installation
1. Before installing thermostat, coat sealing surface with
silicon grease.
2. Install O-ring.
3. Install thermostat housing and tighten bolts to the specified torque.
Torque: 15 N ⋅
⋅⋅
⋅
m (1.5 kgf ⋅
⋅⋅
⋅
m)
4. Installation rubber hose.
5. Replenish engine coolant (EC).
6. Start engine and check for EC leakage.













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.

Visually inspect for damage, leak (silicon 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.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007