2007 ISUZU KB P190 ECO mode

6B – 8 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
(EC) level should be between the “MIN" and “MAX" lines o
f
reserve tank when the engine is cold. If low, check for leakage
and add EC 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 EC
should also be free from oil.
Replace the EC if excessively dirty.


P1010064
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 unde
r
pressure.
3. Disconnect all hoses from the EC 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 EC using a solution that is at least 50 percent antifreeze.

Procedure for filling with coolant (in case of full change)
• Make sure that the engine is cool.
• Open radiator cap pour coolant up to filler neck.
• Pour coolant into reservoir tank up to “MAX" line.
• Tighten radiator cap and start the engine. After idling for 2
to 3 minutes, stop the engine and reopen radiator cap. If the
water level is lower, replenish.
WARNING: When the coolant is heated to a high
temperature, be sure not to loosen or remove the radiato
r
cap. Otherwise you might get scalded by not vapor or
boiling water. To open the radiator cap, put a piece of
thick cloth on the cap and loosen the cap slowly to reduce
the pressure when the coolant has become cooler.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6C – 12 FUEL SYSTEM

Removal
CAUTION: When repair to the fuel system has been
completed, start engine and check the fuel system for
loose connection or leakage. For the fuel system
diagnosis, see Section “Driveability and Emission".
1. Remove fuel tank assembly (9). Refer to “Fuel Tank
Removal" in this section.
2. Disconnect the quick connector (6) of the fuel tube from fuel gauge unit.
3. Disconnect the quick connector (10) of the evapo tube from fuel gauge unit.



140R100035
3. Remove the retainer ring (7) from the fuel tank with the
removal tool 5-8840-2602-0.
4. Remove slowly the fuel gauge unit (4) from the fuel tank as
no bend float arm.
NOTE: Cover opening for the fuel gauge unit on fuel tank to
prevent any dust entering.
5. Discard fuel gauge unit seal (8) because it cannot be
reusable.


Installation
1. Clean the seal surface of the fuel tank and the fuel gauge unit.
NOTE: If there is dust on the seal surface, it becomes cause o
f
fuel leak.
2. Install the new fuel gauge unit seal (8) to opening of the fuel tank as along the groove.
3. Install slowly the fuel gauge unit (4) into the fuel tank as no bend float arm.
4. Set flange of the fuel gauge unit on fuel gauge unit seal as
mating convexity of the fuel gauge unit and reentrant of the
fuel tank.
5. Lock slowly the retainer ring (7) to the fuel tank with the
remover tool 5-8840-2602-0.
6. Connect the quick connector (10) of the evapo tube from fuel gauge unit.
7. Connect the quick connector (6) of the fuel tube to to gauge
unit.
NOTE: Pull off the left ckecker of the fuel pipe.
NOTE: Refer to “Fuel Tube/Quick Connector Fittings” in this
section when performing any repairs.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

FUEL SYSTEM 6C – 13

8. Check leak.
Methed of leak check.
(1) Plug end of quick connector and breather hose (Pull of
f
the breather hose from fuel tank) and tighten fuel filler
cap until at least one click are heard.
(2) Apply water soap around the fuel gauge unit seal area.
(3) Pressure air into the fuel tank from end of breather pipe
at 5psi (34.3 kPa/2.8kgf/cm
2) over 15 seconds.
(4) Verify no bubbles around the fuel gauge unit seal area.
9. Install the fuel tank assembly (9).
NOTE: Refer to “Install the fuel tank” in this section.


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

FUEL SYSTEM 6C – 15


140R100037
2. For removal of the quick connector, hold the quick
connector in one hand, and pull out the connector with the
other hand while pressing the square relieve button of the
connector, as illustrated.
NOTE: Do not use tools of any kind. Only use bare hands
when disconnecting the connector. Use a lubricant (light oil)
and/or push and pull the connector until the pipe is
disconnected.





140R100028
Cover the connectors that was removed with a plastic bag,
to prevent dust or rain water from entering.






140R100036
Reuse of Quick–Connector
• Replace the port and connector if scratch, dent or crack is
found.
• Remove any dirt build up on the port when installing the
connector. Replace the connector, if there is any forms o
f
rust, dent, scratch.
• After cleaning the port, insert it straight into the connecto
r
until it clicks. After it clicks, try pulling at 49N (5kgf) it out to
make sure that it is not drawn and is securely locked.


Assembling Advice
By applying engine oil or light oil to the pipe, port makes pipe
assembly easier. The pipe assembly should take place
immediately after applying oil (to prevent dust from sticking to
the pipe surface – which may decrease sealing ability). Test/Inspection After Assembling
1. Reconnect the battery negative cable.
2. Start the engine and observe the engine idle speed. The presence of dirt in the fuel system may affect the fuel
injection system.
3. Check for fuel leakage from the connector.





BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6C – 24 FUEL SYSTEM







13. Throttle Position Sensor Harness Connector
(4JA1TC/4JH1TC only)
Reconnect the harness connector to the throttle position
sensor.
14. Power Steering Pump Bracket

15. Fan
16. Vacuum Hose
Connect the vacuum hose to the EGR valve and the
intake throttle.

Euro under Euro I Euro II Euro III
4JA1L without with with Not used
4JA1TC Not used Not used Not used With cooler
(EGR cooler)
4JH1TC without with with With
(EGR cooler)

17. Accelerator Control Cable
1) Connect the accelerator cable to the injection pump (4JA1T) the intake throttle. (4JA1TC/4JH1TC only)
18. Power Steering Pump Assembly
19. Drive Belt
Install the drive belt and adjust the belt tension.
20. Battery



BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

FUEL SYSTEM 6C – 25
INJECTION NOZZLE (4JA1L)
DISASSEMBLY

RTW 76CMF000401

Disassembly Steps
1. Retaining nut 2. Nozzle & pin
3. Spacer & pin
4. Lift Piece
5. Spring seat
6. Push rod
7. Shim (Second nozzle opening pressure adjustment)
8. Second spring 9. Collar
10. Spring seat
11. First spring
12. Shim (First nozzle opening pressure adjustment)
13. Nozzle holder body
14. Eye bolt



Important Operations
Injection nozzle adjustment is possible only on the 4JA1L
engine.
The two-spring nozzle holder has been developed to
reduce NOx (Nitrogen Oxides) and particulates from direct
injection diesel engine exhaust.
Before disassembly remove carbon deposit from nozzle
and nozzle holder using a wire brush and wash the outside
nozzle holder assembly.
Caution:
Do not touch nozzle holes with the wire brush during
cleaning it.
Disassemble the nozzle holder assembly to numerical
order.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

6C – 26 FUEL SYSTEM
REASSEMBLY

RTW 76CMF000501


Reassembly Steps
1. Nozzle holder body 2. Shim (First opening pressure adjustment)
3. First spring
4. Spring seat
5. Collar
6. Second spring
7. Push rod
8. Shim (Second opening pressure adjustment) 9. Spring seat
10. Lift Piece
11. Spacer & pin
12. Nozzle & pin
13. Retaining nut
14. Eye bolt











Important Operations
The nozzle holder is adjusted as the components are
reassembled in the sequence above.
As adjustment of the two-spring nozzle holder is made in
hundredths of a millimeter, clean the parts thoroughly in
light oil to completely remove any dirt or foreign matter.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

FUEL SYSTEM 6C – 27

REASSEMBLY AND ADJUSTMENT PROCEDURE
1 First nozzle opening pressure adjustment Adjust the first nozzle opening pressure using the shim.

2
Full needle valve lift confirmation Confirm the full needle valve lift in accordance with the
closed method.

3 Pre-lift confirmation

Confirm pre-lift in accordance with the closed method.

CAUTION:
If not as specified, replace the nozzle assembly, lift
piece, pins and spacer using the nozzle service kit.
4
Second nozzle opening pressure
confirmation Confirm the second nozzle opening pressure in accordance
with the closed method.

5 Second nozzle opening pressure
adjustment Adjust the second nozzle opening pressure using the shim.

6
Final inspection Confirm the condition of the fuel spray with the nozzle and
nozzle holder assembled.







First nozzle opening pressure adjustment
Nozzle needle valve full-lift 0.25 mm (0.0098 in)
Nozzle needle valve pre-lift 0.04 mm(0.0016 in) at 20,000 kPa (2901 psi, 204 kg/cm2)
Nozzle pressure
4JA1T(L) 1st Stage 19.1 MPa (2759 psi, 194 kg/cm2)
2nd Stage 25.5-27.0 MPa (3768-3911 psi, 260-275 kg/cm2)

NOTE: Only 4JA1L can perform adjustment of a nozzle.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007