2007 ISUZU KB P190 engine coolant

Engine Mechanical – V6 Page 6A1–90

3 Remove the coolant pump seal (1) from the engine
front cover (2). Discard the seal.
Figure 6A1 – 88
Clean
4 Remove any RTV sealant (1) from the engine front cover using a plastic or wood scraper.
CAUTION
• Insert a piece of cardboard between the
front of the oil pan and oil pump to
prevent any contaminants from falling
into the oil pan.
• Do not use a sharp or metal gasket
scraper to clean the sealing surfaces.
5 Clean out any debris from the bolt holes.
6 Clean the front cover with a suitable cleaning solvent.
7 Dry the front cover with compressed air.

Safety glasses must be worn when using
compressed air. Figure 6A1 – 89
8 Use compressed air to remove any engine coolant from the engine cooling passages and from the top of the oil pan oil deflector.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–91

Inspect
1 Inspect both sides of the engine front cover for the
following conditions:
• damage to the camshaft position actuator valve
oil seal bores (1),
• damage to the bolt holes (2),
• damage and/or corrosion to the engine coolant
passage (3),
• dents or damage to the exterior (4),
• damage to the crankshaft front oil seal bore (5),
• gouges or damage to the coolant pump sealing
surfaces (6), and
• damage to the coolant pump bolt hole
threads (7).
2 Repair or replace the front cover as required.
Figure 6A1 – 90
Reassemble
1 Install a new crankshaft front oil seal (1) into the front cover (2) using crankshaft front seal installer, Tool
No. J-29184 (3) and a suitable hammer.

CAUTION
Do not lubricate the crankshaft front oil seal
or crankshaft balancer sealing surfaces. The
crankshaft balancer is installed into a dry
seal.
Figure 6A1 – 91
2 Install a new camshaft position actuator valve oil seal (1) into the front cover (2) using Tool No. EN-46103
(3) and a suitable hammer.

Figure 6A1 – 92

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–162

9 Remove and discard the cylinder head gasket (1).

Figure 6A1 – 276
Left-hand Side (Bank 2) Cylinder Head
1 Remove the intake manifold assembly, refer to 3.10 Intake Manifold Assembly – Complete.
2 Remove the exhaust manifold, refer to 3.11 Exhaust Manifold Assembly.
3 Remove the power steering reservoir and pump mounting brackets, refer to 3.8 Power Steering Pump Bracket.
NOTE
Do not disconnect the power steering pipes
and/or hoses.
4 Remove the oil filter adapter upper bolt. NOTE
Do not remove the oil filter adapter.
5 Remove the engine coolant temperature (ECT) sensor, refer to 6C1-3 Engine Management – V6 – Service Operations.
6 Remove engine harness ground terminal attaching bolt from cylinder head, refer to 8A Electrical Body & Chassis.
7 Remove the left-hand bank secondary timing chain, refer to 3.16 Timing Chains, Tensioners, Shoes and Guides.
8 Remove the camshaft position actuators, refer to 3.18 Camshaft Sprocket.
9 Remove the front M8 (1) cylinder head attaching bolt, two places.
10 Remove the cylinder head attaching bolt (2), eight places.
11 Remove the cylinder head (3).

Figure 6A1 – 277

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–166

10 Remove the cylinder head oil gallery expansion
plugs (1).

Figure 6A1 – 285
11 Remove the cylinder head coolant threaded plugs (1).

Figure 6A1 – 286
Clean
CAUTION
Due to the aluminium alloy construction of
the cylinder head, wire brushes and steel
scrapers must not be used during the
cleaning process, as damage to sealing
surfaces may occur. Use a wood or plastic
scraper as an alternative.
1 Remove any old thread sealant, gasket material or sealant using commercially available plastic or wooden scraper.
2 Clean all cylinder head surfaces with non-corrosive solvent.

Safety glasses must be worn when using
compressed air.
3 Blow out all the oil galleries using compressed air.
4 Remove any carbon deposits from the combustion chambers.
5 Clean any debris or build-up from the lifter pockets.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–167

Inspect
Visual Inspection
1 Inspect the cylinder head (1) camshaft bearing
surfaces for the following conditions:
• excessive scoring or pitting,
• discoloration from overheating, and
• deformation from excessive wear.
2 If any of the above conditions exist on the camshaft bearing surfaces, replace the cylinder head. Do not
machine the camshaft bearing journals.

Figure 6A1 – 287
3 Inspect the cylinder head for the following: • Cracks, damage or pitting in the combustion chambers.
• Debris in the oil galleries. continue to clean the galleries until all debris is removed.
• Coolant leaks or damage to the deck face sealing surface. if coolant leaks are present, measure the surface
warpage as described under Cylinder Head Measurement within this Section.
• Burrs or any defects that would degrade the sealing of a new secondary camshaft chain tensioner gasket.
• Damage to any gasket surfaces.
• Damage to any threaded bolt holes.
• Burnt or eroded areas in the combustion chamber.
• Cracks in the exhaust ports and combustion chambers.
• External cracks in the water passages.
• Restrictions in the intake or exhaust passages.
• Restrictions in the cooling system passages.
• Rusted, damaged or leaking core plugs.
4 If the cylinder head is cracked or damaged, it must be replaced. No welding or patching of the cylinder head is recommended.
Cylinder Head Measurement
NOTE
For all cylinder head and associated component
specifications, refer to 5 Specifications.
Camshaft Journal Clearance
1 Install the camshaft bearing cap in the cylinder head without the camshaft.
2 Install the camshaft cap bolts and tighten to the correct torque specification
Camshaft bearing cap attaching bolt........8.0 – 12.0 Nm.
3 Measure the camshaft bearings using an inside micrometer.
4 Subtract the camshaft journal diameter from the camshaft bearing diameter. This will provide the running clearance. If the running clearance exceeds specifications and the camshaft journals are within specification, replace the
cylinder head.
Camshaft Journal Alignment
1 Ensure the camshafts are serviceable, refer to 3.19 Camshaft for measuring procedures.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–174

Valve Stem Height Measurement Procedure
CAUTION
To determine the valve stem height
measurement, measure from the valve
spring seat to the valve spring retainer.
1 Install the valve into the valve guide.
2 Ensure the valve is seated to the valve seat.
3 Install the valve stem oil seal.
4 Install the valve spring retainer and valve stem keys.
5 Measure the distance (1) between the cylinder head to the bottom of the valve spring retainer, refer to 5
Specifications.
6 If the maximum height specification is exceeded, a new valve should be installed and the valve stem
height re-measured.
Figure 6A1 – 297
CAUTION
Do not grind the valve stem tip. The tip of the
valve is hardened and grinding the tip will
eliminate the hardened surface causing
premature wear and possible engine damage.
CAUTION
Do not use shims to adjust valve stem height.
The use of shims will cause the valve spring
to bottom out before the camshaft lobe is at
peak lift and engine damage could result.
7 If the valve stem height still exceeds the maximum height specification, the cylinder head must be replaced.
Assemble
1 Install the cylinder head coolant threaded plugs (1) and tighten to the correct torque specification.




Cylinder head threaded plug ..............................31.0 Nm

Figure 6A1 – 298

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–185

Remove
1 Remove the skid plate.
2 Drain the radiator coolant, refer to 6B1 Engine Cooling – V6.
3 Disconnect the battery negative and positive terminal, refer to 8A Electrical Body & Chassis.
4 Remove the battery from the vehicle.
5 Depressurise the fuel system pressure, refer to 6C Fuel System – V6.
6 Make alignment marks on the bonnet and hinges in order to return the bonnet to the exact original position.
7 Remove the bonnet, refer to 2B Sheet Metal.
8 Remove the rubber hose (2) and air duct (1).

Figure 6A1 – 317

9 Disconnect the barometric sensor connector (1).
Figure 6A1 – 318

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–194

54 Remove the power steering pump bracket mounting
bolts (three places) then remove the pump bracket
(1).
Figure 6A1 – 342
55 Release the lower radiator hose clamp (1) and remove the lower hose from the coolant pipe (2).
Figure 6A1 – 343
56 Release the upper radiator hose clamp (1) and remove the upper hose from the coolant pipe (2).
Figure 6A1 – 344

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ISUZU KB P190 2007