engine ISUZU KB P190 2007 Workshop Repair Manual

Engine Mechanical – V6 Page 6A1–146

13 Remove the bolt (1) attaching left-hand intake
camshaft sprocket (2) and remove the sprocket.
Figure 6A1 – 235
Clean
1 Clean the exterior of each camshaft sprocket with solvent.

Safety glasses must be worn when using
compressed air.
2 Dry the timing components with compressed air.
Inspect
1 Inspect the front of each sprocket for the following:
• Sprocket damage (1), and
• Sprocket bolt seating inner hub damage (2).

Figure 6A1 – 236

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Engine Mechanical – V6 Page 6A1–147

2 Inspect the back of each sprocket for the following:
• Sprocket damage (1),
• Camshaft locating pin damage (2) and,
• Camshaft seating/sealing inner hub flange
damage (3),


NOTE
These checks apply to both the inlet and
exhaust camshaft sprockets.
Figure 6A1 – 237
Reinstall
Reinstallation of the camshaft sprockets is the reverse of the removal procedure, noting the following:
1 Align the sprockets and timing chain with the marks made during removal.
2 Tighten the camshaft sprocket bolts to the correct torque specification.
Camshaft sprocket attaching
bolt torque specification ..........................49.0 – 67.0 Nm
3 Remove the timing chain retention tools.
3.19 Camshaft
Remove
Right-hand Side
1 Remove the right-hand cylinder head camshaft sprockets, refer to 3.18 Camshaft Sprocket.
2 Remove the Tool No. EN-46105 – 1 (1) from the right- hand cylinder head camshafts (2).



NOTE
Tool No. EN-46105 was installed as part of the
right-hand cylinder head camshaft sprocket
removal procedure.
Figure 6A1 – 238

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–148

3 Observe the markings (1) on the bearing caps. Each
bearing cap is marked to identify its location. The
markings have the following meanings:
• The raised feature must always be oriented
toward the centre of the cylinder head.
• An I indicates the intake camshaft.
• An E indicates the exhaust camshaft.
• The number indicates the journal position from
the front of the engine.

Figure 6A1 – 239
4 Remove the camshaft bearing cap bolts (1) and caps (2).
Figure 6A1 – 240
5 Remove the camshafts (1).

Figure 6A1 – 241

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–149

Left-hand Side
1 Remove the left-hand cylinder head camshaft position actuators, refer to 3.18 Camshaft Sprocket.
2 Remove Tool No. EN-46105 – 1 (1) from the left-hand camshafts.


NOTE
Tool No. EN-46105 was installed as part of the
left-hand cylinder head camshaft position
actuator removal procedure.

Figure 6A1 – 242
3 Observe the markings (1) on the bearing caps. Each bearing cap is marked in order to identify its location.
The markings have the following meanings:
• The raised feature must always be oriented
toward the centre of the cylinder head.
• An I indicates the intake camshaft.
• An E indicates the exhaust camshaft.
• The number indicates the journal position from
the front of the engine.

Figure 6A1 – 243
4 Remove the camshaft bearing cap bolts (1) and caps (2).
Figure 6A1 – 244

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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 6A1–151

Camshaft Measurement
1 W ith 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 – 247
3 Measure the camshaft (2) journals for diameter and out-of-round using an outside micrometer (1).

Figure 6A1 – 248
4 Measure the camshaft runout using a dial indicator (1).

Figure 6A1 – 249

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–152

5 Measure the camshaft thrust width for wear using a
depth micrometer (A).

Figure 6A1 – 250
6 Measure the camshaft thrust wall surface for runout using a dial indicator (1).

Figure 6A1 – 251
7 Measure the camshaft lobes for wear using a dial indicator (1).

Figure 6A1 – 252

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Engine Mechanical – V6 Page 6A1–153

8 Place the dial indicator tip on the base circle (1) of the
camshaft lobe.
9 Set the dial indicator at zero.
10 Rotate the camshaft until the indicator tip is at the highest point (2) on the lobe. This reading is the lift of
the camshaft lobe.

Figure 6A1 – 253
Reinstall
Right-hand Side
1 Select the correct camshaft for the particular installation location. ID markings are on the rear end
of each camshaft. The ID markings are defined as
follows:
• The first five digits refer to the date and time of
production.
• Example = 3L18H.
• Digits six through nine refer to engine
production code.
• LY7 = Alloytec 190 engine.
• The last two digits refer to position:
• LI = left-hand intake.
• LE = left-hand exhaust.
• RI = right-hand intake.
• RE = right-hand exhaust.

Figure 6A1 – 254
2 Apply a liberal amount of engine oil to the camshaft (1) journals and the right-hand cylinder
head camshaft carriers (2).

Figure 6A1 – 255

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–154

3 Position the camshafts (1) on the cylinder head and
assemble the camshaft sprockets to the camshafts.



NOTE
Install the camshaft sprocket bolts but do not
tighten at this stage.

Figure 6A1 – 256
4 Ensure the camshaft lobes are in the neutral position with the flats on the back of the camshafts up and
parallel (1) with the right-hand cylinder head camshaft
cover rail.
5 Ensure the marks on the right-hand exhaust camshaft position actuator and timing chain, made prior to the
disassemble operation are aligned.
6 Ensure the marks on the right-hand intake camshaft position actuator and timing chain, made prior to the
disassemble operation are aligned.

Figure 6A1 – 257
7 Observe the markings on the right-hand cylinder head camshaft bearing caps. Each bearing cap is
marked (1) to identify its location. The markings have
the following meanings:
• The raised feature must always be oriented
toward the centre of the cylinder head.
• The I indicates the intake camshaft.
• The E indicates the exhaust camshaft.
• The number 1, 3, 5 indicates the cylinder
position from the front of the engine.
8 Apply a liberal amount of engine oil to the camshaft bearing caps.

Figure 6A1 – 258

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–155

9 Install the camshaft bearing thrust cap (1) in the first
journal of the right-hand cylinder head.
10 Install the remaining bearing caps (2) with their orientation mark toward the centre of the cylinder
head.
11 Hand start all the camshaft bearing cap bolts (3).

Figure 6A1 – 259
12 Tighten the camshaft bearing cap bolts to the correct torque specification and in the sequence shown.

Camshaft bearing cap attaching
bolt torque specification:
Stage 1:.....................................................8.0 – 12.0 Nm
13 Loosen the centre intake camshaft bearing cap bolts 1 and 2, and the centre exhaust camshaft bearing cap
bolts 3 and 4.
14 Retighten the centre camshaft bearing cap bolts 1, 2, 3 and 4 to the correct torque specification.

Camshaft bearing cap attaching
bolt torque specification:
Stage 2:.....................................................8.0 – 12.0 Nm
Figure 6A1 – 260
Left-hand Side
1 Select the correct camshaft for the particular installation location. ID markings can be found on the
rear end of each camshaft. The ID markings are
defined as follows:
• The first five digits refer to the date and time of
production.
• Example = 3L18H.
• Digits six through nine refer to engine
production code.
• LY7 = Alloytec 190 engine.
• The last two digits refer to position:
• LI = left-hand intake.
• LE = left-hand exhaust.
• RI = right-hand intake.
• RE = right-hand exhaust.

Figure 6A1 – 261

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