2007 ISUZU KB P190 Workshop Repair Manual

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Page 2641 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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, re

Page 2642 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Mechanical – V6 Page 6A1–163

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

Figure 6A1 – 278
Disassemble
1 Using an appropriately sized deep socket (1) and a plastic hamm

Page 2643 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Mechanical – V6 Page 6A1–164

CAUTION
Do not compress the valve springs less than
24.0 mm. Contact between the valve spring
retainer and the valve stem oil seal can
cause potential

Page 2644 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Mechanical – V6 Page 6A1–165

5 Remove the valve spring retainer (1).
6 Remove the valve spring (2).

Figure 6A1 – 282
7 Remove the valves (1).

Figure 6A1 – 283
CAUTION
N

Page 2645 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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

Page 2646 of 6020

ISUZU KB P190 2007 Workshop Repair Manual 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,
�

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

Page 2647 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Mechanical – V6 Page 6A1–168

2 Inspect the cylinder head camshaft bearing surfaces for any imperfections or scratches that could inhibit correct
camshaft clearances. Repair minor imper

Page 2648 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Mechanical – V6 Page 6A1–169

Valve Guide Measurement
1 Measure the valve stem (1) to-guide (2) clearance.
Excessive valve stem-to-guide clearance may cause
excessive oil consumption

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