2007 ISUZU KB P190 oil temperature

ENGINE DRIVEABILITY AND EMISSIONS 6E–277
SPARK PLUG CABLES
The cable contains a synthetic conductor which is easily
damaged. Never stretch or kink the cable. Disconnect
the cable from spark plug and the ignition coil.
The original equipment cables and the ignition coil are
marked to show correct location of the cables. If spark
plug cables or the ignition coil are replaced previously,
before cables are removed from the ignition coil, mark
the cables and the coil so they can be reconnected in
the same position.
Inspection
NOTE: Never puncture the spark plug cable’s insulation
with a needle or the pointed end of a probe into the
cable. An increase in resistance would be created which
would cause the cable to become defective.
1. If the cable has broken or cracked insulation, it must be replaced.
2. If the terminals are corroded or loose, the cable must be replaced.
3. Check that the cable resistance does not exceed specified value.
#1 cylinder: 3.50k Ω - 5.24k Ω
#2 cylinder: 2.89k Ω - 4.33k Ω
#3 cylinder: 2.49k Ω - 3.73k Ω
#4 cylinder: 2.22k Ω - 3.32k Ω
EMISSION CONTROL ; *
**
*
CO ADJUSTER (W/
O CATALYSTIC CONVERTER)
* CO : Carbon monoxide
Location
Under the leht-hand side of the front sheet.
Removal Procedure 1. Remove the left-hand side of the front sheet. Refer to Sec.10 CAB “Front Sheet”.
2. Disconnect the CO adjuster connector.
3. Remove the CO adjuster.
Installation Procedure 1. Connect the CO adjuster connector.
2. Install the left-hand side of the front sheet. Refer to Sec.10 CAB “Front Sheet”.
3. Check and adjust CO concentration.
Checking procedure 1. Operate the engine at normal temperature.
2. Turn all accessories switch OFF.
3. Place the select lever in the “N” range.
4. Start the engine at idle.

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Engine Mechanical – V6 Page 6A1–1

6A1
Engine Mechanical – V6
ATTENTION
Before performing any service operation or other procedure described in this Section, refer to 1.1
WARNING, CAUTION and NOTES for correct workshop practices with regard to safety and/or property
damage.
1 General Information ............................................................................................................ ...................8
1.1 WARNING, CAUTION and NOTES .................................................................................................... ................... 8
Definition of WARNING, CAUTION and NOTE Statements ............................................................................. .... 8
WARNING defined ............................................................................................................................................. 8
CAUTION defined .............................................................................................................................................. 8
NOTE defined..................................................................................................................................................... 9
1.2 Engine Components .............................................................................................................................................. 9
Major Component Assemblies..................................................................................................... ......................... 9
Intake Manifold Assembly ................................................................................................................................... 10
Engine Front Cover.............................................................................................................................................. 12
Camshaft Timing Components ..................................................................................................... ...................... 13
Camshaft Cover Assembly.................................................................................................................................. 14
Cylinder Head Assembly ..................................................................................................................................... 15
Oil Pump ............................................................................................................................................................... 16
Engine Block Assembly .......................................................................................................... ............................ 17
Pistons, Rings, Bearing and Connecting Rod ..................................................................................... .............. 18
Oil Pan Assembly................................................................................................................................................. 19
Oil Filter Assembly .............................................................................................................................................. 20
1.3 Engine Serial Number........................................................................................................... ............................... 20
1.4 Engine Construction............................................................................................................................................ 21
Cylinder Block ...................................................................................................................................................... 21
Cylinder Heads ................................................................................................................. .................................... 21
Crankshaft ............................................................................................................................................................ 22
Pistons, Pins and Connecting Rods .............................................................................................. .................... 22
Camshaft Drive System ....................................................................................................................................... 22
1.5 Engine Lubrication System ...................................................................................................... ........................... 24
Lubrication Description....................................................................................................................................... 24
1.6 Service Notes ....................................................................................................................................................... 24
Cleanliness and Care........................................................................................................... ................................ 24
Replacing Engine Gaskets ....................................................................................................... ........................... 24
Re-Using Gaskets and Applying Sealants......................................................................................... ............... 24
Separating Components................................................................................................................................... 24
Cleaning Gasket Surfaces................................................................................................................................ 24
Assembling Components .......................................................................................................... ....................... 25
Use of Room Temperature Vulcanising and Anaerobic Sealer....................................................................... .25
Room Temperature Vulcanising Sealer............................................................................................................ 25
Anaerobic Sealer .............................................................................................................................................. 25
Pipe Joint Compound ............................................................................................................ ........................... 26
Separating Parts .................................................................................................................................................. 26
Tools and Equipment ............................................................................................................ .............................. 26
Fasteners .............................................................................................................................................................. 27
Clamp Load ..................................................................................................................... ................................. 27
Torque Angle and Torque to Yield Fasteners..................................................................................... .............. 27
2 Diagnosis ..............................................................................................................................................28
2.1 Engine Diagnosis ............................................................................................................... .................................. 28
2.2 Symptoms............................................................................................................................................................. 28
Strategy Based Diagnosis ....................................................................................................... ............................ 28

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Engine Mechanical – V6 Page 6A1–15

Cylinder Head Assembly

Figure 6A1 – 7
Legend
1 Cylinder Head, Left-hand
2 Cylinder Head, Right-hand
3 Cylinder Head Gasket, Left-hand
4 Cylinder Head Gasket, Right-hand
5 Cylinder Head Bolt
6 Cylinder Head Front Bolt
7 Cylinder Head Coolant Hole Threaded Plug
8 Spark Plug Sleeve
9 Cylinder Head Oil Gallery Expansion Plug
10 Exhaust Valve
11 Intake Valve
12 Valve Rocker Arm Assembly
13 Hydraulic Valve Lash Adjuster Assembly
14 Valve Stem Oil Seal 15 Valve Spring
16 Valve Spring Cap
17 Valve Stem Key
18 Cylinder Head Camshaft Front Thrust Bearing Cap
19 Camshaft Oil Seal Ring
20 Exhaust Camshaft
21 Intake Camshaft, Left-hand (bank 2)
22 Intake Camshaft, Right-hand (bank 1)
23 Exhaust Camshaft, Right-hand (bank 1)
24 Cylinder Head Camshaft Cap – Intermediate
25 Cylinder Head Camshaft Cap Bolt
26 Cylinder Head Oil Galley Check Valve
27 Engine Coolant Temperature Sensor

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Engine Mechanical – V6 Page 6A1–24

1.5 Engine Lubrication System
Lubrication Description
A structural diecast aluminium oil pan is fitted that incorporates an oil suction pipe, an oil deflector and an oil level sensor.
The oil suction pipe is bolted into the oil pan and seals to the bottom of the cylinder block with a gasket. The oil deflector
is bolted to the upper portion of the oil pan and ensures oil supply is maintained under all conditions. The oil level sensor
is mounted through the bottom of the oil pan.
A crankshaft driven gerotor oil pump is mounted to the front of the cylinder block. The pump, which incorporates an
internal pressure-relief valve, draws oil from the oil suction tube through the lower passage in the cylinder block. Oil is
then directed through an upper passage to the left-hand side of the cylinder block where the oil filter adapter is mounted.
The oil filter adapter incorporates a top-access, cartridge style oil filter. The filter is accessed through a screw-on cap tha t
incorporates an oil bypass valve. The oil filter adapter housing incorporates a drain back control valve and a threaded oil
pressure sender. Oil flows through a lower passage within the oil filter adapter and through the oil filter cartridge. Filtered
oil travels back through the upper passage of the adapter and into the engine block.
Oil is then directed up and across the front of the cylinder block, through several drilled passages. These front passages
feed oil to each cylinder head, the passage for the main bearings and piston oil jets, the right-hand and left-hand
secondary idler sprockets and to the primary timing chain tensioner.
Each cylinder head passage directs oil into oiling circuits for the stationary hydraulic lash adjusters (SHLAs) and the
camshaft bearing journals. An additional passage in the cylinder head also directs oil to the secondary timing chain
tensioner.
The oil passage that supplies oil to the main bearings also supplies oil to pressure actuated piston cooling oil jets. Each
oil jet is mounted between opposing cylinder bores and directs oil to the two bores to provide extra cooling and control
piston temperatures.
From the front passages, oil is directed to the front of the block where the right-hand and left-hand intermediate drive
shaft sprockets and the primary timing chain tensioner are mounted. Each camshaft timing chain tensioner relies on a
gasket to maintain an oil reserve after the engine is turned off. All camshaft timing chain tensioners incorporate a small
oil jet to supply an oil spray onto the camshaft timing chain components.
Oil returns to the oil pan, either through the camshaft timing chain area or through the drain back passages on the
outboard walls of the cylinder heads and cylinder block.
1.6 Service Notes
Cleanliness and Care
Throughout this Section, correct cleaning and protection of machined surfaces and friction areas is a part of the repair
procedure. This is considered standard workshop practice, even if not specifically stated.
W hen any internal engine part is serviced, care and cleanliness is extremely important.
W hen components are removed for service, they should be marked, organised or retained in a specific order for
reassembly.
At the time of installation, components should be installed in the same location and with the same mating surface as
when removed.
Any engine is a combination of many machined, honed, polished and lapped surfaces with tolerances that are measured
in thousandths of a millimetre. These surfaces should be covered or protected to avoid component damage.
A liberal coating of clean engine oil should be applied to friction areas during assembly, as the lubrication will protect and
lubricate friction surfaces during the initial engine start-up.
Replacing Engine Gaskets
Re-Using Gaskets and Applying Sealants
• do not reuse any gasket unless specified,
• gaskets that can be reused will be identified in the service procedure, and
• do not apply sealant to any gasket or sealing surface unless specified in the service information.
Separating Components
• Use a rubber mallet to separate components.
• Bump the part sideways to loosen the components.
• Bumping should be done at bends or reinforced areas to prevent distortion of parts.
Cleaning Gasket Surfaces
• W here required, remove all gasket and sealing material from the part using a plastic or wood scraper.
• Care must be used to avoid gouging or scraping the sealing surfaces.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–25

• Do not use any other method or technique to remove sealant or gasket material from a part.
• Do not use abrasive pads, sand paper, or power tools to clean the gasket surfaces as these methods of cleaning
can cause damage to the component sealing surfaces. Abrasive pads also produce fine grit that the oil filter cannot
remove from the oil. This grit is abrasive and has been known to cause internal engine damage.
Assembling Components
• W hen assembling components, use only the sealant specified or equivalent in the service procedure.
• Sealing surfaces should be clean and free of debris or oil.
• Specific components such as crankshaft oil seals or valve stem oil seals may require lubrication during assembly.
• Components requiring lubrication will be identified in the service procedure.
• W hen applying sealant to a component, apply the amount specified in the service procedure.
• Do not allow the sealant to enter into any blind threaded holes as it may prevent the bolt from clamping correctly or
cause component damage when tightened.
• Only ever tighten bolts to the correct torque specification. Do not over-tighten.
Use of Room Temperature Vulcanising and Anaerobic Sealer
CAUTION
A number of sealant types are commonly
used in engines. Examples are; room
temperature vulcanising (RTV) sealer,
anaerobic gasket eliminator sealer, and
anaerobic thread sealant and pipe joint
compound. The correct type of sealant and
amount must be used in the specified location
to prevent oil leaks. Do not interchange the
different types of sealers.
Room Temperature Vulcanising Sealer
• Room temperature vulcanising (RTV) sealant hardens when exposed to air. This type of sealer is used where two
non-rigid parts (such as the intake manifold and the engine block) are assembled together.
• Do not use RTV sealant in areas where extreme temperatures are experienced. These areas include the exhaust
manifold, head gasket, or other surfaces where a gasket eliminator is specified.
• Follow all safety recommendations and directions that are on the container.
• To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.
• Apply RTV to a clean surface. Use a bead size as specified in the service procedure. Run the bead to the inside of
any bolt holes. Do not allow the sealer to enter any blind threaded holes, as it may prevent the bolt from clamping
correctly or cause damage when the bolt is tightened.
• Assemble components while RTV is still wet (within 3 minutes). Do not wait for RTV to skin over.
• Tighten the bolts to the correct torque specification. Do not over-tighten.
Anaerobic Sealer
• Anaerobic gasket eliminator or thread sealant, hardens in the absence of air. This type sealer is used where two
rigid parts (such as castings) are assembled together, where fasteners are subjected to vibration, or where the
holes are not blind. W hen two rigid parts are disassembled and no sealer or gasket is readily noticeable, the parts
were probably assembled using a gasket eliminator.
• Follow all safety recommendations and directions that are on the container.
• To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.
• Apply a continuous bead of gasket eliminator to one flange or on the bolt/stud thread. All surfaces must be clean
and dry.
• Spread the sealer evenly to achieve a uniform coating on the sealing surface.
• Do not allow the sealer to enter any blind threaded holes as it may prevent the bolt from clamping correctly or
cause damage when tightened.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–26

CAUTION
Anaerobic sealed joints that are partially
tightened and allowed to cure more than five
minutes may result in incorrect shimming and
sealing of the joint.
• Tighten the bolts to the correct torque specification. Do not over-tighten.
• After correctly tightening the fasteners, remove the excess sealer from the outside of the joint.
Pipe Joint Compound
• Pipe joint compound is a pliable sealer that does not completely harden. This type of sealer is used where two non-
rigid parts (such as pressed steel and machined surfaces) are assembled together.
• Do not use pipe joint compound in areas where extreme temperatures are expected. These areas include the
exhaust manifold, head gasket, or other surfaces where gasket eliminator is specified.
• Follow all safety recommendations and directions that are on the container.
• To remove the sealant or the gasket material, refer to Replacing Engine Gaskets.
• Apply the pipe joint compound to a clean surface. Use a bead size or quantity as specified in the procedure. Run
the bead to the inside of any bolt holes. Do not allow the sealer to enter any blind threaded holes as it may prevent
the bolt from clamping correctly or cause component damage when the bolt is tightened.
• Apply a continuous bead of pipe joint compound to one sealing surface. Sealing surfaces to be resealed must be
clean and dry.
• Tighten the bolts to the correct torque specification. Do not over-tighten.
Separating Parts
CAUTION
Many internal engine components will
develop specific wear patterns on their
friction surfaces. When disassembling the
engine, internal components must be
separated, marked and organised in a way to
ensure reinstallation in their original location
and position.
Separate, mark, or organise the following components:
• Piston and the piston pin.
• Piston to the specific cylinder bore.
• Piston rings to the specific piston.
• Connecting rod to the crankshaft journal.
• Connecting rod to the bearing cap.
• Crankshaft main and connecting rod bearings.
• Camshaft and rocker arms.
• Rocker arms and stationary hydraulic lash adjusters to cylinder head location.
• Valve to the valve guide.
• Valve spring and shim to the cylinder head location.
• Engine block main bearing cap location and direction.
• Oil pump drive and driven gears.
Tools and Equipment
Special tools are listed and illustrated throughout this Section with a complete listing at the end, refer to 7 Special
Tools. These tools (or their equivalents) are specially designed to quickly and safely accomplish the operations for which
they are intended. The use of these special tools will also minimise possible damage to engine components. Some
precision measuring tools are required for inspection of certain critical components. A commercially available torque
wrench and torque angle wrench, Tool No. EN-7115 are required for the correct tightening of various fasteners.
To correctly service the engine assembly, the following items should be readily available:
• Approved eye protection and safety gloves.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–28

2 Diagnosis
2.1 Engine Diagnosis
Begin engine mechanical system diagnosis by reviewing the disassembled views provided in 1.2 Engine Components
and 1.4 Engine Construction. Reviewing the description and operation information provided will assist in determining
whether the condition described by the customer is a fault or normal engine operation.
2.2 Symptoms
Strategy Based Diagnosis
1 Review the system operations to familiarise yourself with the system functions, refer to 1 General Information and 6C1-1 Engine Management General Information.
2 Perform an engine management Diagnostic System Check, refer to 6C1-2 Engine Management – V6 – Diagnostics.
All diagnosis on a vehicle should follow a logical process. Strategy based diagnosis is a uniform approach for repairing
all vehicle systems. The strategy based diagnostic flow chart may always be used to resolve a system problem. The
diagnostic flow chart is the place to start when repairs are required. For a detailed explanation of strategy based
diagnosis and the flow chart, refer to 6C1-2 Engine Management – V6 – Diagnostics.
Visual / Physical Inspection
1 Inspect the vehicle for aftermarket accessories which may adversely affect engine operation.
2 Inspect the easily accessible or visible system components for obvious signs of damage or conditions that may cause the symptom.
3 Check the engine lubrication system for the following:
• correct oil level,
• correct lubricant viscosity,
• correct oil filter application, and
• contaminated or burnt oil.
4 Confirm the exact operating conditions under which the fault occurs. Note factors such as:
• engine speed (r.p.m.),
• ambient temperature,
• engine temperature,
• engine warm-up time, and
• vehicle road speed.
5 Compare the engine sounds, if applicable, to a known good engine, and ensure you are not trying to diagnose a normal operating condition.
Intermittent
For intermittent faults, test the vehicle under the same conditions the customer reported in order to confirm whether the
system is operating correctly.

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Engine Mechanical – V6 Page 6A1–37

2.13 Coolant in Combustion Chamber
Definition
Excessive white smoke and/or coolant type odour emitted from the exhaust pipe may indicate coolant in the combustion
chamber. Low coolant levels, an inoperative engine cooling fan or a faulty thermostat may lead to an over-temperature
condition which may cause internal engine component damage. A slower than normal cranking speed may indicate
coolant entering the combustion chamber.
1 Remove the spark plugs and inspect for spark plugs saturated by coolant and coolant in the cylinder bore.
2 Inspect by performing a cylinder leakage test, refer to 2.16 Cylinder Leakage Test. During this test, excessive air bubbles in the coolant may indicate a faulty head gasket, cracked cylinder head or cracked cylinder
block.
3 Inspect by performing a cylinder compression test. Two cylinders side-by-side on the cylinder block, with low compression, may indicate a failed cylinder head gasket, refer to 2.15 Engine Compression Test.
Cause Correction
Cracked intake manifold or faulty gasket. Replace components as required, refer to 3.10
Intake Manifold Assembly – Complete.
Faulty cylinder head gasket. Replace the cylinder head gasket, refer to 3.22
Cylinder Head Assembly.
W arped cylinder head. Repair or replace the cylinder heads as required, refer to
3.22 Cylinder Head Assembly.
Cracked cylinder liner or block Repair or replace the cylinder block and components as
required, refer to 4.7 Cylinder Block.
Cylinder head or cylinder block porosity. Repair or replace the cylinder block or cylinder heads as
required, refer to 4.7 Cylinder Block or 3.22
Cylinder Head Assembly.
2.14 Coolant in Engine Oil
Definition
Foamy or discoloured oil or an engine oil overfill condition may indicate coolant entering the engine crankcase. Low
coolant levels, an inoperative engine cooling fan or a faulty thermostat may lead to an over-temperature condition which
may result in engine component damage. Contaminated engine oil and oil filters must be replaced.
1 Inspect the oil for excessive foaming or an overfill condition. Oil diluted by coolant may not correctly lubricate the crankshaft bearings, resulting in component damage, refer to 2.10 Lower Engine Noise, Regardless of Engine
Speed.
2 Perform a cylinder leakage test, refer to 2.16 Cylinder Leakage Test. During this procedure, excessive air bubbles in the engine coolant may indicate a faulty gasket or damaged component.
3 Perform a cylinder compression test. Two cylinders side-by-side on the cylinder block, with low compression, may indicate a failed cylinder head gasket, refer to 2.15 Engine Compression Test.
Cause Correction
Faulty cylinder head gasket. Replace the cylinder head gasket, refer to 3.22
Cylinder Head Assembly.
W arped cylinder head. Repair or replace the cylinder heads as required, refer to
3.22 Cylinder Head Assembly.
Cracked cylinder liner or block Repair or replace the cylinder block and components as
required, refer to 4.7 Cylinder Block.
Cylinder head, cylinder block or intake manifold porosity. Repair or replace the cylinder block, cylinder heads or intake manifold components as required, refer to 4.7
Cylinder Block, 3.22 Cylinder Head
Assembly or 3.10 Intake Manifold Assembly – Complete.

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