2007 ISUZU KB P190 check engine

Engine Cooling – V6 Engine Page 6B1–37

Test
1 W ith the thermostat (1) installed in the housing,
suspend it and a suitable thermometer (2) in a
container of 50% clean fresh water and 50% Dexron ®
long life coolant, (conforming to GM 6277M).
NOTE
Neither the thermostat assembly (1) nor the
thermometer (2) should rest on the bottom of the
container because of uneven concentration of
heat at this point when the container is heated.
2 Heat container until thermostat begins to open. Agitate solution to ensure uniform temperature. Note
temperature and ensure thermostat opens within
specified temperature range.
Thermostat Opening Specifications
Opening Temperature ........................................ 82 ° C
Fully Open Temperature .................................... 95 ° C
3 Replace thermostat if it does not meet these operating
conditions.
Figure 6B1 –
––
–
39
Dismantle

Only dismantle the thermostat if a reverse
flushing operation of the cylinder block is to
be carried out. If the testing operation
indicates that the thermostat is faulty, then
the housing and thermostat are only serviced
as an assembly.
Remove thermostat (1) from thermostat housing (2) as
follows:
a Secure the thermostat housing by gripping in a vice fitted with soft jaws.

Always wear protective safety glasses when
working with spring-loaded devices. Failure
to do so could result in eye injury.
b Depress the retaining bar (3) on both sides of the thermostat and rotate the thermostat until it
clears the retaining lugs (4) on the thermostat
housing (2).
c Release the thermostat spring force.
d Remove the thermostat assembly from the thermostat housing.
Figure 6B1 – 40
Reassembly
The reassembly process is the reverse to that used for disassembly, with the following exceptions:
1 Check that the valve sealing surface is undamaged.
2 W ipe the valve sealing surface to ensure a clean surface.

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–39

18 Check for coolant leaks. Refer to 3.7 Pressure Testing in this Section.
19 Install the radiator shroud.
20 Install the engine dress covers. Refer to 6A1 Engine Mechanical.
21 Reconnect battery ground lead. Refer to 8A_ Electrical Body & Chassis.
22 Road test the vehicle to check for correct operation.
3.9 Coolant Recovery Reservoir
Remove

Figure 6B1 – 41
Legend
1 Filler Cap
2 Reservoir

Remove the reservoir assembly attaching screws, and remove the reservoir assembly from the vehicle.
Inspect
1 Drain contents from reservoir assembly.
2 Clean the reservoir assembly with water and dry using compressed air.
3 Check reservoir and assembly for damage, for example abrasions, cracks or distortion. Replace if required.
Install
Installation of the reservoir assembly is the reverse of removal procedures, noting the following points:

1 Refill cooling recovery reservoir and cooling system with the correct concentration of coolant. Refer to 3.3 Draining and Filling Cooling System in this Section.

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–40

2 Check coolant recovery system for leaks.
3.10 Coolant Pump
Remove

Refer to 3.1 Service Notes in this Section, for
important safety items.
NOTE
The coolant pump is not to be disassembled and
is replaced only as an assembly.
1 Allow engine to cool to ambient temperature (less than 50 ° C), and then remove the coolant filler cap (located at
the front left-hand side of the engine).

Disconnection of the battery affects certain
vehicle electronic systems. Refer to 1.1
WARNING, CAUTION and NOTES, before
removing the ground lead.
2 Disconnect the battery ground lead. Refer to 8A – Electrical Body & Chassis.
3 Loosen coolant pump pulley to hub bolts (1).
NOTE
While the view shows the drive belt removed,
it will be easier to loosen the four pulley bolts,
with the belt installed.

Figure 6B1 – 42

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–44

5 Install coolant pump pulley and attaching bolts (1).
6 Install drive belt (reverse to removal procedures) and ensure that the drive belt is aligned with all accessory
pulleys and crankshaft balancer drive belt grooves.
NOTE
Refer to Figure 6B1 – 43, as required for the
correct drive belt routing.
7 Tighten coolant pump pulley attaching bolts (1) to the correct torque specification.
Coolant pump pulley to hub
bolt torque specification ...................................12 N.m
8 Close the radiator drain tap on the lower LHS of the radiator and remove the piece of rubber tubing to the
tap outlet.
Figure 6B1 – 49
9 Refill cooling system. Refer to 3.3 Draining and Filling Cooling System in this Section.
10 Check for coolant leaks. Refer to 3.7 Pressure Testing in this Section.
11 Install the radiator shroud.
12 Reconnect battery ground lead. Refer to 8A – Electrical Body & Chassis.

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Engine Cooling – V6 Engine Page 6B1–46

6 Remove the two coolant outlet housing attaching
bolts (1), and remove coolant outlet housing (2).
7 Remove and discard coolant outlet housing O-ring (3) and seal (4).

Figure 6B1 – 51
Reinstall
1 Ensure that the coolant outlet housing and front outlet mating surfaces are clean and dry.
2 Install new O-ring and seal to coolant outlet housing.
3 Install coolant outlet housing and attaching bolts. Tighten all bolts to the correct torque specification.
Coolant outlet housing to front
outlet bolt torque specification..............................10 N.m

Always wear protective safety glasses when
working with spring type hose clamps. Failure
to do so could result in eye injury.
4 Connect the upper radiator hose and clamp to the coolant outlet housing connection.
5 Close the radiator drain tap on the lower RHS of the radiator and remove the piece of rubber tubing to the tap outlet.
6 Reinstall the intake manifold assembly. Refer to 6A1 Engine Mechanical.
7 Refill cooling system. Refer to 3.3 Draining and Filling Cooling System in this Section.
8 Check for coolant leaks. Refer to 3.7 Pressure Testing in this Section.
9 Reconnect battery ground lead. Refer to 8A – Electrical Body & Chassis.
3.12 Coolant Inlet Pipe
Remove

Refer to 3.1 Service Notes in this Section, for
important safety items.
1 Allow engine to cool to ambient temperature (less than 50 ° C), and then remove the coolant filler cap (located at
the front left-hand side of the engine).

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–48

Install
1 Ensure that the coolant inlet pipe and thermostat housing mating surfaces are clean and dry.
2 Install new O-ring to the coolant inlet pipe.
3 Install coolant inlet pipe at the thermostat housing and secure with the attaching bolt. Tighten all bolts to the correct torque specification.
Coolant inlet pipe to thermostat
housing bolt torque specification ..........................23 N.m
4 Raise the front of the vehicle and support on safety stands. Refer to 0A General Information for the location of jacking and support points.
5 Reinstall the coolant inlet pipe to the engine block and secure with the bolt tightened to the correct torque specification.
Coolant inlet pipe to engine block bolt
torque specification .............................................25 N.m

Always wear protective safety glasses when
working with spring type hose clamps. Failure
to do so could result in eye injury.
6 Connect the lower radiator outlet hose and clamp to the coolant inlet pipe connection.
7 Close the radiator drain tap on the lower RHS of the radiator and remove the piece of rubber tubing to the tap outlet.
8 Lower the front of the vehicle.
9 Refill cooling system. Refer to 3.3 Draining and Filling Cooling System in this Section.
10 Check for coolant leaks. Refer to 3.7 Pressure Testing in this Section.
11 Reconnect battery ground lead. Refer to 8A – Electrical Body & Chassis.

3.13 Cooling Fan and Shroud Assembly
Remove

Disconnection of the battery affects certain
vehicle electronic systems. Refer to 1.1
WARNING, CAUTION and NOTES, before
removing the ground lead.
1 Disconnect the battery ground lead. Refer to 8A – Electrical Body & Chassis.
2 Remove the intake duct and mass air flow as an assembly. Refer to 6A1 Engine Mechanical.
3 Remove the coolant recovery hose from the fan shroud retaining clip.

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–50


When removing, transporting or installing the
fan and shroud assembly, do not grasp the
assembly by the fan rings (1) as this may
bend the fan motor shaft and cause fan
vibrations

Figure 6B3 – 56
When handling the fan assembly, always hold
the assembly at the fan shroud (1).

Figure 6B3 – 57
Install
Installation of the cooling fan and shroud assembly is the reverse of removal procedures, noting the following points:
1 Ensure that fan and shroud assembly to radiator attaching clips are fully engaged.
2 Ensure that the top automatic transmission cooling pipe (if fitted) is installed to the integral shroud clip.
3 Check cooling fan operation. Refer to 6C1-2 Engine Management Diagnostics. Also check for correct rotational direction of the cooling fan.

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–53

NOTE
Should the spring clip or the O-ring seal in the
quick connect fitting be damaged during the line
removal process, then the complete fitting must
be replaced.
Reinstall
1 Remove the plugs installed in the transmission cooler line and hose openings and wipe all exposed parts
with a clean shop rag.
• Smear clean automatic transmission fluid on
each cooler line end, then push into the radiator
quick connect fittings. As a security check gently
pull on the connector to ensure correct
engagement.
• As a security check, push and clip each
verification disc into place over the quick-
connect fittings. If difficulty is experienced,
repeat the installation process until the
verification disc can be clipped into place over
the radiator quick-connect fitting.

If the verifier disc does not clip into place,
the quick-connect fitting is not engaged,
rectify this before proceeding.
• Snap the outlet cooler line (4) in the clip (5) of
the radiator fan shroud
• At the transmission end, again clean the line
ends and proceed as detailed in step 2. As a
further security check ensure that each
verification disc can be pushed into place over
the quick connect fitting. If difficulty is
experienced, then the line has not been
completely installed. Remove and repeat the
installation process again until the verification
disc can be clipped into place over the
transmission quick connect fitting
• Ensure that all line clamps are fitted correctly
and that the lines and hoses are correctly routed
and free of obstructions
• Tighten the screw attaching the cooler lines
bracket to the correct torque specifications
• If required, top up the transmission fluid level
(cold)
• Start the engine and check for any fluid leak at
the fittings. If a leak is found, stop the engine
and rectify the leak
Figure 6B1 – 61

Transmission cooler lines bracket
attaching screw torque specification ..................23.0 Nm


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ISUZU KB P190 2007