2007 ISUZU KB P190 key

Engine Mechanical – V6 Page 6A1–170

Measurement Procedure
1 Use a commercially available valve spring tester to
measure the valve spring tension, refer to 5
Specifications.
CAUTION
Do not use shims to increase spring load.
The use of shims can cause the valve spring
to bottom out before the camshaft lobe is at
peak lift.
2 If low valve spring load is found, replace the valve springs.



Figure 6A1 – 290
Valve and Seat Grinding
Valve Cleaning Procedure
CAUTION
Do not use a wire brush on any part of the
valve stem. The valve stem is chrome plated
to provide enhanced wear characteristics.
Wire brushing the stem could remove the
chrome plating.
1 Use soft bristle brush to clean any carbon build-up from the valve head.
2 Thoroughly clean the valve with solvent and wipe dry.
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 – 291
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 the valve or valve seat must
be reconditioned, it is critical to perform the measurement procedures after reconditioning.

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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 6A1–176

7 Position the valve spring (2) on the spring seat (1).
8 Place the valve spring retainer onto the valve spring.
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 valve stem oil seal damage.

Compressed valve springs (1) have high
tension against the valve spring
compressor (2). Valve springs that are not
correctly compressed by, or are released
from, the valve spring compressor can be
ejected from the valve spring compressor
with intense force. Use care when
compressing or releasing the valve spring
with the valve spring compressor and when
removing or installing the valve stem keys.
Failing to use care may cause personal
injury.
Figure 6A1 – 302
9 Compress the valve spring using valve spring compressor Tool No. J-8062 and adaptor Tool No.
EN-46119.



CAUTION
Ensure correct directional placement of
valve collets (1) in Tool No. EN-46117 (2).
The valve collets must be installed with the
tapered end towards the valve stem seal.
Figure 6A1 – 303
10 W ith the spring compressed, install the valve collets into Tool No. EN 46117.



Figure 6A1 – 304

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–187


Plug the fuel feed hose after removal to
prevent dirt entering the pipe.
12 Disconnect the fuel pipe connector and injector harness connector.
13 Disconnect the fuel feed hose from the fuel rail (1), refer to 6C Fuel system.
14 Pull out release bar (2) of the fuel injector harness wiring connector (3).
15 Disconnect the fuel injector harness wiring connector from the fuel injector wiring harness (4).

Figure 6A1 – 321
16 To disconnect the throttle body connector (1) the following procedure must be followed.
17 Retract the throttle body wiring connector lock (3) while pressing the connector latch in the direction of
the arrow (4).
18 Disconnect the throttle body wiring connector (1).
19 Release the throttle body connector wiring harness from its retaining clip (5).

Take care not to break the barbed retainer
pin (6), when removing the harness. Should
the pin be damaged it is vital that a new
harness retainer be fitted.
20 Remove the main wiring harness retainer pin (6) from the intake manifold by pushing from the front to the
rear using a suitable length of 5mm steel rod or an
allen key.

Figure 6A1 – 322
21 Disconnect the PCV fresh air tube (1) from the upper intake manifold mounting clip (2) and remove the
fixing bolt (3).

Figure 6A1 – 323

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–296

Tool Number Illustration Description
EN-46117
Valve Stem Key Remover / Installer
Used in conjunction with J-8062 or EN-46110 to remove and
reinstall the valve stem keys.
EN-46119
Off-vehicle Valve Spring Compressor Adaptor
Used in conjunction with J-8062 to remove valve springs with
the engine disassembled.
EN-46120 and
J-42096

Valve Guide Reamer
Used to oversize valve guides prior to the installation of new
oversized valves.
EN-46121
Connecting Rod Guide Pin Set
Used to guide connecting rods onto the crankshaft journals
and prevent damage to the cylinder bores, journal faces and
piston cooling jets during engine assembly procedures.
EN-46122
Oil Control Valve Check Ball Remover / Installer
EN-7115 Torque Angle W rench
Used to accurately tighten fasteners when an angle torque is
required.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–15
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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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–78
Page 6A1–78
3 Retract the throttle body wiring connector lock (3).
4 While pressing the connector latch in the direction of
the arrow (4), disconnect the throttle body wiring
connector.
5 Disconnect the throttle body connector wiring harness from its retaining clip (5).
6 Remove the main wiring harness retainer pin (6) from the intake manifold by pushing from the front to the
rear using a suitable piece of 5 mm steel rod (or an
Allen key).

The following precautions must be followed
when disconnecting the throttle body wiring
connector:
• Do not use any mechanical device such
as a screwdriver to disengage the
harness connector (1) from the throttle
body (2).
• When retracting the throttle wiring
connector lock (3), take care not to
disengage the lock from the connector.
• Do not pull on the connector wires.
• Take care not to break the barbed
harness retainer pin (6) while removing
the harness retainer from the intake
manifold.
• Should the pin be broken, then it is
vital that a new harness retainer is
fitted to the wiring harness shield. If
not, the harness will foul the engine
drive belt.
Figure 6A1 – 35
7 Disconnect the brake booster hoses from the upper intake manifold:

Figure 6A1 – 36

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–84
Page 6A1–84
4 Retract the throttle body wiring connector lock (3).
5 While pressing the connector latch in the direction of
the arrow (4), disconnect the throttle body wiring
connector.
6 Disconnect the throttle body connector wiring harness from its retaining clip (5).
7 Remove the main wiring harness retainer pin (6) from the intake manifold by pushing from the front to the
rear using a suitable piece of 5 mm steel rod (or an
Allen key).

The following precautions must be followed
when disconnecting the throttle body wiring
connector:
• Do not use any mechanical device such
as a screwdriver to disengage the
harness connector (1) from the throttle
body (2).
• When retracting the throttle wiring
connector lock (3), take care not to
disengage the lock from the connector.
• Do not pull on the connector wires.
• Take care not to break the barbed
harness retainer pin (6) while removing
the harness retainer from the intake
manifold.
• Should the pin be broken, then it is vital
that a new harness retainer is fitted to the
wiring harness shield. If not, the harness
will foul the engine drive belt.

Figure 6A1 – 44
8 Disconnect the brake booster hose (1), from the upper
intake manifold:


Figure 6A1 – 45

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