2007 ISUZU KB P190 ESP

Engine Mechanical – V6 Page 6A1–150

5 Remove the camshafts (1).

Figure 6A1 – 245
Clean
1 Clean the camshaft in solvent.

Safety glasses must be worn when using
compressed air.
2 Dry the camshaft with compressed air.
Inspect
Camshaft Visual Inspection
1 Inspect the threaded hole (2) for damage.
2 Inspect the camshaft sprocket locating notch (3) for damage or wear.
3 Inspect the camshaft sealing grooves (4) for damage.
4 Inspect the camshaft thrust surface (5) for damage.
5 Inspect the camshaft lobes (6) and journals (7) for the following conditions:
• Excessive scoring or pitting
• Discoloration from overheating
• Deformation from excessive wear, especially
the camshaft lobes
6 If any of the above conditions exist on the camshaft, replace the camshaft.
Figure 6A1 – 246

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–24
Page 6A1–24
Camshaft Drive System
Three timing chains are fitted:
• primary (1),
• right-hand secondary (2), and
• left-hand secondary (3), refer to Figure 6A1 – 18 for the HFV6 engine.
The primary timing chain connects the crankshaft sprocket (4) with the left-hand and right-hand intermediate drive shaft
sprockets (5).
Each oil pressure fed intermediate sprocket drives the se condary timing chains, which subsequently drive the respective
cylinder head camshaft position actuators (6).
Two stationary timing chain guides (7) and movable timing c hain shoes (8) control secondary timing chain backlash.
Each secondary timing chain shoe is under tension from an oil pressure hydraulically operated tensioner (9). To control
backlash on the primary chain, two st ationary timing chain guides (10) and an oil pressure hydraulically actuated
tensioner with built in shoe (11) are fitted.
The tensioners minimise timing chain noise and provide accura te valve action by keeping slack out of the timing chains,
while continuously adjusting for timing chain wear. The tensioners incorporate a plunger that adjusts outward with wear,
minimising backlash. The tensioners are equipped with oiling jets to spray oil onto the timing components during engine
operation. Each tensioner is sealed to the head or block using a rubber coated steel gasket. The gasket traps an
adequate oil reserve to ens ure quiet start-up.

Figure 6A1 – 18
Legend
1 Primary Timing Chain
2 Secondary Timing Chain, Right-hand
3 Secondary Timing Chain, Left-hand
4 Crankshaft Sprocket
5 Intermediate Sprocket
6 Camshaft Sprocket 7 Secondary Timing Chain Guide
8 Secondary Timing Chain Shoe
9 Secondary Timing Chain Tensioner
10 Primary Timing Chain Guide
11 Primary Timing Chain Tensioner


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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–188
Page 6A1–188
CAUTION
Ensure the tips of Tool No.
EN-46108 are fully engaged into the timing
chain and the wing nuts are tight and the
timing chain is taught.
9 Install Tool No. EN-46108 (1 and 2) to retain the timing chain (3 and 4).
10 Firmly tighten the wing nuts of Tool No. EN-46108.
11 Mark the timing chain and the respective location on both camshaft sprocket.
NOTE
Ensure the camshaft timing chain and the
camshaft sprocket are marked for correct
reassembly.

Figure 6A1 – 301
12 Remove the bolt (1) attaching the right-hand exhaust camshaft sprocket (2) and remove the sprocket.


Figure 6A1 – 302
13 Remove the bolt (1) attaching right-hand intake camshaft sprocket (2) and remove the sprocket.

Figure 6A1 – 303

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–190
Page 6A1–190
NOTE
Use an open-end wrench (1) at the camshaft
hex (2) to prevent camshaft/engine rotation.
NOTE
Do not remove the cams haft sprocket bolt (3) at
this time.
8 Loosen the camshaft sprocket bolt (3). NOTE
If the camshaft timing chain has already been
removed proceed to Step 12.


Figure 6A1 – 306
CAUTION
Ensure the tips of Tool No. EN-46108 are
fully engaged into the timing chain and the
wing nuts are tight and the timing chain is
taught.
9 Install Tool No. EN-46108 (1 and 2) to retain the timing chain (3 and 4).
10 Firmly tighten the wing nuts of Tool No. EN-46108.
NOTE
Ensure the camshaft timing chain and the
camshaft sprocket are marked for correct
reassembly.
11 Mark the timing chain and the respective location on both camshaft sprocket.

Figure 6A1 – 307
12 Remove the bolt (1) attaching the left-hand exhaust camshaft sprocket (2) and remove the sprocket.

Figure 6A1 – 308

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–195
Page 6A1–195
11 Ensure that the feet (2) of the Tool No. EN 48313 are
facing the front of the engine.
CAUTION
DO NOT tighten the Tool No. EN 48313 at
this stage.
12 Partially expand the legs (1) on the Tool No. EN 48313 by turning the T-shaped handle clockwise.
CAUTION
Ensure the feet (2) of the Tool No. EN 48313
are correctly engaged into one of the link
pockets to prevent the chain from slipping
during tightening.
13 Continue expanding the Tool No. EN 48313 until the feet (2) contact the timing chain.

Figure 6A1 – 316
14 Hand tighten the Tool No. EN 48313. DO NOT allow the body of the Tool No. EN 48313 to rotate when tightening
the T-handle.
15 Use an open-end spanner on the hex cast into both the right intake and exhaust camshafts and rotate the
camshafts towards each other in order to creat e slack in the chain between the actuators.
16 The Tool No. EN 48313 is now correctly inst alled to hold the timing chain in position.
NOTE
Ensure the camshaft timing chain and the
camshaft position actuators are marked for
correct reassembly.
17 Mark the timing chain and the respective location on both camshaft position actuators.
18 Remove the bolt (1) attaching the right-hand exhaust camshaft sprocket (2) and remove the sprocket.


Figure 6A1 – 317

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–198
Page 6A1–198
11 Ensure that the feet (2) of the Tool No. EN 48313 are
facing the front of the engine.
CAUTION
DO NOT tighten the Tool No. EN 48313 at
this stage.
12 Partially expand the legs (1) on the Tool No. EN 48313 by turning the T-shaped handle clockwise.
CAUTION
Ensure the feet (2) of the Tool No. EN 48313
are correctly engaged into one of the link
pockets to prevent the chain from slipping
during tightening.

Figure 6A1 – 323
13 Continue expanding the Tool No. EN 48313 until the feet (2) contact the timing chain.
14 Hand tighten the Tool No. EN 48313. DO NOT allow the body of the Tool No. EN 48313 to rotate when tightening
the T-handle.
15 Use an open-end spanner on the hex cast into both the left intake and exhaust camshafts and rotate the camshafts
towards each other in order create sla ck in the chain between the actuators.
16 The Tool No. EN 48313 is now correctly inst alled to hold the timing chain in position.
NOTE
Ensure the camshaft timing chain and the
camshaft position actuators are marked for
correct reassembly.
17 Mark the timing chain and the respective location on both camshaft position actuators.
18 Remove the bolt (1) attaching the left-hand exhaust camshaft sprocket (2) and remove the sprocket.

Figure 6A1 – 324

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–205
Page 6A1–205
Inspect
Camshaft Visual Inspection
1 Inspect the threaded hole (2) for damage.
2 Inspect the camshaft spro cket locating notch (3) for
damage or wear.
3 Inspect the camshaft sealing grooves (4) for damage.
4 Inspect the camshaft thrust surface (5) for damage.
5 Inspect the camshaft lobes (6) and journals (7) for the following conditions:
• Excessive scoring or pitting
• Discoloration from overheating
• Deformation from excessive wear, especially
the camshaft lobes
6 If any of the above conditions exist on the camshaft, replace the camshaft.

Figure 6A1 – 336
Camshaft Measurement
1 With the camshaft (1) in a suitable fixture (2), measure the camshaft for wear.
2 For camshaft measurement, refer to the following specifications, 5 Specifications .

NOTE
If the camshaft measures outside the specified
range, replace the camshaft.
CAUTION
No machining of the camshaft is allowed.

Figure 6A1 – 337
3 Measure the camshaft (2) journals for diameter and out-of-round using an outsi de micrometer (1).


Figure 6A1 – 338

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ISUZU KB P190 2007

Engine Cooling – V6 Engine Page 6B1–19

a Place a few drops of distilled water (between 21 and 29° C) onto the measuring window, then close the
plastic cover.
b Point the tester toward any light source, look into the eyepiece and check that the indicated reading is zero. If not, then re-calibrate the tester as detailed at the end of this Test Method, Calibrating the Tester.
2 Release the tip of the bulb pump from under the refractometer body. It is not necessary to remove the
complete pump from the tool.

Refer to 3.1 Service Notes in this
Section, for important safety items.
3 Carefully remove the coolant filler cap.
4 Insert the tube of the pump into the coolant, and then press the bulb to obtain a sample.
5 Bend the tube around and insert the end into the cover plate opening.
Figure 6B1 – 15
6 Press the pump bulb to deposit a few drops of coolant onto the measuring surface. Do not open the plastic cover when taking readings, as moisture evaporation will change the reading obtained.
7 Point the coolant tester toward any light source, looking into the eyepiece.
a The coolant protection reading is at the point where the dividing line between the light and
dark, crosses the scale.
b The scale for ethylene glycol (bold arrow) is the reference scale for either DEX-COOL®
long-life coolant or its equivalent, known as
Extended Life Anti-freeze Coolant conforming
to GM specification 6277M.
NOTE
The temperature scale is reversed from that of
a conventional thermometer. Below zero
readings are on the upper half of the scale.
8 A reading between – 30 and – 52 °C (corresponding
to a coolant concentration between 45 to 60%), is
satisfactory for the HFV6 engine cooling system.
Figure 6B1 – 16

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