2007 ISUZU KB P190 engine

6B – 16 ENGINE COOLING

P1010064
Removal
1. Disconnect battery ground cable.
2. Loosen a drain plug to drain EC.
3. Disconnect oil cooler hose on automatic transmission (A/T).
4. Disconnect radiator inlet hose and outlet hose from the engine.





PTW 46BSH000101
5. Remove fan guide(1), clips(2) on both sides and the bottom
lock, then remove lower fan guide(3) with fan shroud(4).
6. Disconnect the reserve tank hose(6) from radiator.




RTW 36BMH000101
7. Remove bracket(5).

8. Lift up and remove the radiator assembly with hose, taking
care not to damage the radiator core with a fan blade.


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ISUZU KB P190 2007

ENGINE COOLING 6B – 17
Inspection and Repair
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.


Radiator Cap
Measure the valve opening pressure of the pressurizing valve
with a radiator filler cap tester.
Replace the cap if the valve opening pressure is outside the
standard range.
Valve opening pressure kPa (psi) 93.3
∼
∼∼
∼122.7 (13.5
∼
∼∼
∼17.8)
Cap tester: 5–8840–0277–0
Adapter: 5–8840–2603–0
Check the condition of the vacuum valve in the center of the
valve seat side of the cap. If considerable rust or dirt is found,
or if the valve seat cannot be moved by hand, clean or replace
the cap.





110RS006

Valve opening vacuum kPa (psi) 1.96 ∼
∼∼
∼ 4.91 (0.28 ∼
∼∼
∼ 0.71)


Radiator Core
1. A bent fin may result in reduced ventilation and overheating
may occur. All bent fins must be straightened. Pay close
attention to the base of the fin when it is being straightened.
2. Remove all dust, bugs and other foreign material.

Flushing the Radiator
Thoroughly wash the inside of the radiator and the engine
coolant passages with cold water and mild detergent. Remove
all signs of scale and rust.

Cooling System Leakage Check
Use a radiator cap tester to force air into the radiator through
the filler neck at the specified pressure of 196 kPa (28.5 psi)
with a cap tester:
• Leakage from the radiator
• Leakage from the coolant pump
• Leakage from the water hoses

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ISUZU KB P190 2007

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.




RTW 36BMH000101
6. Connect oil cooler hose to automatic transmission.
7. Connect battery ground cable.

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ISUZU KB P190 2007

ENGINE COOLING 6B – 19




RTW 36BSH000101
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).



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ISUZU KB P190 2007

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.


033R300001
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.



033RY00011
2. Inspection (in unit)
W arm 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.

SPECIAL TOOLS
Illustration Tool Number Tool Name

5-8840-0277-0 Cap tester



5-8840-2663-0 Adapter


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ISUZU KB P190 2007

6C – 2 FUEL SYSTEM

MAIN DATA AND SPECIFICATIONS
Description Item
4JA1T (L) 4JA1TC 4JH1TC
Injection pump type Bosch distributor
VE type Bosch distributor VP44 type
Governor type
Mechanical variable
(Half speed oil pressure) Electrical controled
Timer type
Oil pressure Electrical controled
Fuel feed pump type Vane with input shaft
Injection nozzle type Hole type
Number of injection nozzle orifices 5
Injection nozzle orifices
Inside diameter mm (in) 0.19 (0.0075) 0.17 (0.0067) 0.21 (0.0083)
19.1 (195) 19.0 (194) 19.5 (199) Injection nozzle designed operating
pressure MPa (kg/cm2) 1st
2nd 25.0 (255)
33.5 (328) 33.8 (331)
Main fuel filter type Disposable cartridge paper element


Precautions
When working on the fuel system, there are several things
to keep in mind:
•
Any time the fuel system is being worked on,
disconnect the negative battery cable except fo
r
those tests where battery voltage is required.
•
Always keep a dry chemical (Class B) fire
extinguisher near the work area.
• Replace all pipes with the same pipe and fittings that
were removed.
• Clean and inspect “O” rings. Replace if required.
•
Always relieve the line pressure before servicing any
fuel system components.
• Do not attempt repairs on the fuel system until you
have read the instructions and checked the pictures
relating to that repair.
• Adhere to all Notices and Cautions.

NOTE:
Injection nozzle adjustment is possible only on the 4JA1L
engine.


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FUEL SYSTEM 6C – 3
GENERAL DESCRIPTION
FUEL FLOW


RTW 66CMF000101


The fuel system consists of the fuel tank, the fuel filter, the water separator, the injection pump, and the injection
nozzle.
The fuel from the fuel tank passes through the water separator and the fuel filter where water particles and other
foreign material are removed from the fuel.
Fuel, fed by the injection pump plunger, is delivered to the injection nozzle in the measured volume at the optimum
timing for efficient engine operation.
NOTE:
1 If it find abnormal condition on the fuel injector, refer to section 6E ENGINE DRIVEABILITY AND EMISSIONS.
2 Do not contain "Additive for water drain" with fuel.


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ISUZU KB P190 2007

6C – 6 FUEL SYSTEM
INJECTION PUMP



RTW 46CLF000201

4JA1T(L):
A Bosch Distributor Type Injection Pump is used. A single reciprocating/revolving plunger delivers the fuel uniformly
to the injection nozzles, regardless of the number of cylinders.
The governor, the injection timer, and the feed pump are all contained in the injection pump housing. The injection
pump is compact, light weight, and provides reliable high-speed operation.
The vacuum-type fast idle actuator increases the engine idling speed to provide the additional power required to
operate the air conditioner.
Fast idler diaphragm movement is caused by changes in the negative pressure created by the engine’s vacuum
pump.
The diaphragm motion is transferred to the injection pump control lever to increase or decrease the idling speed.

4JA1TC/4JH1TC:
The Bosch VP44 injection pump is electronically controlled. The pump controller combine to injection pump.
Signals from the pump controller are sent to the engine control module (ECM). In response to these signals, the
ECM selects the optimum fuel injection timing and volume for the existing driving conditions.

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ISUZU KB P190 2007