2007 ISUZU KB P190 ECO mode

Engine Mechanical – V6 Page 6A1–179
Page 6A1–179
27 Release the right-hand timing chain tensioner (1) by
pulling out Tool No. EN 46112 (2) and unlocking the
tensioner plunger.


Figure 6A1 – 284
28 Verify all primary and secondary timing chain timing mark alignments (1 to 18).
29 Remove Tool No. EN 46105–1 and EN 46105-2 from the left and right-hand cylinder head camshafts.
30 Reinstall the spark plugs. Refer to Section 6C1-3
Engine Management – V6 – Service Operations.
31 Reinstall the engine front cover assembly, refer to 3.15 Front Cover Assembly .

Figure 6A1 – 285

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–186
Page 6A1–186
3.18 Camshaft Sprocket – Excluding MY06
Update
CAUTION
Setting the camshaft timing is required
whenever the camshaft drive system is
disturbed to ensure the relationship between
any chain and sprocket is not lost. Even when
only one sprocket is involved, multiple
crankshaft rotations will not produce
conditions where correct timing can be
confirmed.
If required, follow the Left-hand Secondary
Camshaft Chain Components reinstallation
procedure to reset the camshaft timing.
Remove
Right-hand Side
1 Remove the right-hand ca mshaft cover, refer to 3.12 Camshaft Cover.
2 Remove the camshaft position sensors, refer to Section 6C1-3 Engine Management – Service Operations.
3 Remove the camshaft position actuator solenoids, refer to Section 6C1-3 Engine Management – V6 – Service
Operations .
4 Remove the crankshaft bal ancer assembly, refer to 3.13 Crankshaft Balancer Assembly .
5 Install the crankshaft rotation socket Tool No. EN-46111 onto the crankshaft.
6 Rotate the crankshaft until the camshafts are in a neutral low tension position. The camshaft flats will be
parallel with the camshaft cover rail (1).

Figure 6A1 – 298

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–193
Page 6A1–193
3.19 Camshaft Sprocket – MY06 Update
CAUTION
Setting the camshaft timing is required
whenever the camshaft drive system is
disturbed to ensure the relationship between
any chain and sprocket is not lost. Even when
only one sprocket is involved, multiple
crankshaft rotations will not produce
conditions where correct timing can be
confirmed.
If required, follow the Left-hand Secondary
Camshaft Chain Components reinstallation
procedure to reset the camshaft timing.
Remove
Right-hand Side
1 Remove the right-hand camshaft cover, refer to 3.12 Camshaft Cover.
2 Remove the camshaft position sensors, refer to Section 6C1-3 Engine Management – Service Operations.
3 Remove the camshaft position actuator solenoids, refer to Section 6C1-3 Engine Management – V6 – Service
Operations .
4 Remove the crankshaft bal ancer assembly, refer to 3.13 Crankshaft Balancer Assembly .
5 Install the crankshaft rotation socket Tool No. EN-46111 onto the crankshaft.
6 Rotate the crankshaft until the camshafts are in a neutral low tension position. The camshaft flats will be
parallel with the camshaft cover rail (1).

Figure 6A1 – 312

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–213
Page 6A1–213
3.21 Rocker Arm
Remove
1 Remove the camshafts from the appropriate cylinder head, refer to 3.19 Camshaft.
2 Remove the rocker arm (1) from the cylinder head (2).


NOTE
Record the rocker arm positions during removal.
CAUTION
If the rocker arms are being reused, they
must be reinstalled in their original location.

Figure 6A1 – 358
Clean and Inspect
1 Inspect the rocker arm roller (1) for the following:
• flat spots,
• excessive scoring and pitting, and
• ensure the roller spins freely
2 Inspect the rocker arm valve tip area (2).
3 Inspect the rocker arm stationary hydraulic lash adjuster (SHLA) pivot area (3).
4 Replace the rocker arm as required.


Figure 6A1 – 359

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–217
Page 6A1–217
3.23 Cylinder Head Assembly
Remove
Right-hand Side (Bank 1) Cylinder Head
1 Remove the heater hoses and heater pipe assembly, refer to Section 6B1 Engine Cooling – V6.
2 Remove the intake mani fold assembly, refer to 3.10 Intake Manifold Assembly – Complete .
3 Remove the exhaust manifold, refer to 3.11 Exhaust Manifold Assembly.
4 Remove engine harness ground terminal attaching bolts from the cylinder head, refer to
Section 8A Electrical Body and Chassis .
5 Remove the right-hand side secondary timing chain, refer to 3.16 Timing Chains, Tensioners, Shoes and Guides.
6 Remove the camshaft sprockets, refer to 3.18 Camshaft Sprocket .
7 Remove the cylinder head attaching bolt (1), eight places.
8 Remove the cylinder head.

NOTE
There is no bolt fitted to the hole in the rear of
the right-hand-hand cylinder head.

Figure 6A1 – 365
9 Remove and discard the cylinder head gasket (1).


Figure 6A1 – 366

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–218
Page 6A1–218
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 reservoi r 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 temper ature (ECT) sensor, refer to Section 6C1-3 Engine Management – V6 – Service
Operations .
6 Remove engine harness ground terminal attach ing bolt from cylinder head, refer to Section 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 – 367
12 Remove and discard the cylinder head gasket (1).


Figure 6A1 – 368

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–222
Page 6A1–222
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 seal ant 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 fr om the combustion chambers.
5 Clean any debris or build-up from the lifter pockets.
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 – 377
3 Inspect the cylinder head for the following: • Cracks, damage or pitting in the combustion chambers.
• Debris in the oil galleries. continue to cl ean the galleries until all debris is removed.
• Coolant leaks or damage to the deck face sealing surfac e. if coolant leaks are present, measure the surface
warpage as described under Cylinder Head M easurement within this Section.
• Burrs or any defects that would degrade the sealing of a new secondar y 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 r eplaced. No welding or patching of the cylinder head is
recommended.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–226
Page 6A1–226
Valve Visual Inspection Procedure
1 Inspect the valve for damage from the head to tip for
the following conditions:
• pitting in the valve seat area (1),
• lack of valve margin (2),
• bending in the valve stem (3),
• pitting or excessive wear in the stem (4),
• worn valve key grooves (5), and
• worn valve tip (6).
2 Replace the valve if any of these conditions exist.


Figure 6A1 – 381
Valve Measurement and Reconditioning Overview
Correct valve service is critical to engine performance. Therefore, all detailed measurement procedures must be followed
to identify components that are out of specification. If the measurement procedures reveal t he valve or valve seat must
be reconditioned, it is critical to perform t he measurement procedures after reconditioning.
Valve Seat Width Measurement Procedure
1 Measure the valve seat (1) width in the cylinder head
using a scale (2).


Figure 6A1 – 382

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007