engine ISUZU KB P190 2007 Workshop Repair Manual

Engine Mechanical – V6 Page 6A1–106

Inspect
Timing Chains
1 Inspect the primary and/or secondary timing chains
for the following:
• binding or worn rollers (1),
• loose links (2), and
• loose pins (3).
2 Replace a damaged timing chain as required.

Figure 6A1 – 128
Camshaft Intermediate Driveshaft Sprockets

Figure 6A1 – 129
1 Inspect the camshaft intermediate driveshaft sprockets for the following: • Damage to the primary and secondary timing chain sprocket (1), refer to Figure 6A1 – 129.
• Damage to the hub bearing (2). Ensure the hub bearing spins freely. If the hub bearing wobbles, is noisy or
feels rough when rotated replace the camshaft intermediate sprocket, and
• Damage to the bolt flange seating / sealing surface (3).
• Damage to the bearing hub-to-engine block sealing surface.
Inlet and Exhaust Camshaft Sprocket
Inspect the camshaft sprocket assemblies, refer to 3.18 Camshaft Sprocket.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–107

Crankshaft Sprocket
1 Inspect the crankshaft sprocket for the following:
• sprocket damage (1),
• bore damage (2),
• keyway damage (3), and
• damage to the cushion material (4).
2 Replace a damaged sprocket as required.

Figure 6A1 – 130
Primary Timing Chain Upper Guide
1 Inspect the primary timing chain upper guide for the following:
• worn guide surface (1),
• cracked or broken guide surface (2), and
• cracked or damaged guide base (3).
2 Replace a damaged guide as required.
Figure 6A1 – 131
Primary Timing Chain Lower Guide
1 Inspect the primary timing chain lower guide for the following:
• worn guide surface (1),
• cracked or broken guide surface (2), and
• cracked or damaged guide base (3).
2 Replace the primary timing chain lower guide by replacing the oil pump assembly, refer to 3.17 Oil
Pump Assembly.

NOTE
The primary timing chain lower guide is not
serviced separately and is part of the oil pump
assembly.
Figure 6A1 – 132

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–108

Primary Timing Chain Tensioner

Figure 6A1 – 133
1 Inspect the primary timing chain tensioner for worn shoe surface (1), refer to Figure 6A1 – 133.
2 Inspect the tensioner for a locked or binding tensioner shaft (2). Reset the plunger (3) and ensure the tensioner shaft moves freely in and out of the body of the tensioner.
NOTE
To reset the tensioner, use a suitably sized flat
blade screwdriver or Tool No. J 45027 (4) to wind
the plunger in a clockwise direction, into the
tensioner shaft.
3 Replace a damaged tensioner as required.
Left-hand Secondary Timing Chain Guide
1 Inspect the left-hand secondary timing chain guide for the following:
• worn guide surface (1),
• cracked or broken guide surface (2), and
• cracked or damaged guide base (3).
2 Replace a damaged guide as required.

Figure 6A1 – 134

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–109

Left-hand Secondary Timing Chain Shoe
1 Inspect the front of the left-hand secondary timing
chain shoe for the following:
• worn shoe surface (1),
• cracked or broken shoe surface (2), and
• cracked or damaged shoe (3).
Figure 6A1 – 135
2 Inspect the back of the shoe for a damaged, worn or missing timing chain tensioner contact pad (1).
3 Replace a damaged shoe as required.

Figure 6A1 – 136
Left-hand Secondary Timing Chain Tensioner

Figure 6A1 – 137
1 Inspect the left-hand secondary timing chain tensioner for damaged plunger-to-shoe contact surface (1), refer to Figure 6A1 – 137.

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–110

2 Inspect the tensioner for locked or binding tensioner shaft (2). Reset the plunger (3) and ensure the tensioner shaft
moves freely in and out of the body of the tensioner.
NOTE
To reset the tensioner, use a suitably sized flat
blade screwdriver or Tool No. J 45027 (4) to wind
the plunger in a clockwise direction, into the
tensioner shaft.
3 Replace a damaged tensioner as required.
Right-hand Secondary Timing Chain Guide
1 Inspect the right-hand secondary timing chain guide for the following:
• worn guide surface (1),
• cracked or broken guide surface (2), and
• cracked or damaged guide base (3).
2 Replace a damaged guide as required.

Figure 6A1 – 138
Right-hand Secondary Timing Chain Shoe
1 Inspect the front of the right-hand secondary timing chain shoe for the following:
• worn shoe surface (1),
• cracked or broken shoe surface (2), and
• cracked or damaged shoe (3).

Figure 6A1 – 139

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–111

2 Inspect the back of the shoe for a damaged, worn or
missing timing chain tensioner contact pad (1).
Replace a damaged shoe as required.
Figure 6A1 – 140
Right-hand Secondary Timing Chain Tensioner

Figure 6A1 – 141
1 Inspect the right-hand secondary timing chain tensioner for damaged plunger-to-shoe contact surface (1), refer to Figure 6A1 – 141.
NOTE
To reset the tensioner, use a suitably sized flat
blade screwdriver or Tool No. J 45027 (4) to wind
the plunger in a clockwise direction, into the
tensioner shaft.
2 Inspect the tensioner for a locked or binding tensioner shaft (2). Reset the plunger (3) and ensure the tensioner shaft moves freely in and out of the body of the tensioner.
3 Replace a damaged tensioner as required.
Reinstall
Left-hand Secondary Timing Chain Components


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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–112

1 Install the crankshaft sprocket (1) onto the
crankshaft (2) by aligning the keyway to the key on
the crankshaft.
2 Slide the crankshaft sprocket on the crankshaft until the crankshaft sprocket contacts the step in the
crankshaft.

Figure 6A1 – 142
NOTE
Ensure that the crankshaft sprocket is installed
with the timing mark (1) visible.
Figure 6A1 – 143
CAUTION
In order to install Tool No. EN 46105 onto the
camshafts, rotate the camshafts in an anti-
clockwise direction. There should be no
need to rotate the camshaft more than 45
degrees.
Figure 6A1 – 144

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–113

3 Install Tool No. EN 46105-1 (1) onto the rear of the
left-hand cylinder head camshafts (2), and Tool No.
EN 46105-2 onto the rear of the right-hand cylinder
head camshafts.
4 Ensure that Tool No. EN 46105 is fully seated onto the camshafts.


CAUTION
All camshafts must be locked in place before
installation of any timing chains.
Figure 6A1 – 145
5 Using Tool No. EN46111 (1), rotate the crankshaft in a clockwise direction until the crankshaft sprocket
timing mark (2) is aligned with the indexing mark (3)
on the oil pump housing.
Figure 6A1 – 146
6 Install the left-hand secondary timing chain (1) aligning the chain in the following manner:

Figure 6A1 – 147

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–114

7 W rap the secondary timing chain around both left-
hand camshaft drive sprockets.
8 Ensure there are two bright links located on top of each of the camshaft actuator sprockets.

Figure 6A1 – 148
CAUTION
When aligning the left-hand secondary timing
chain to the camshaft actuator sprockets,
ensure the circular timing marks on the
sprocket are used, NOT the triangular mark.

9 Align the bright plated timing chain link (1) with the left-hand exhaust camshaft position actuator sprocket
alignment circle mark (2).

Figure 6A1– 153

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–115

10 Align the bright plated timing chain link (1) with the
intake camshaft position actuator sprocket alignment
circle mark (2).

Figure 6A1 – 149
11 Ensure the left-hand camshaft intermediate driveshaft sprocket is selected and orientated correctly.


CAUTION
The left-hand camshaft intermediate
driveshaft sprocket (1) is marked with the
letters LB and ‘FRONT’, and the right-hand
sprocket (2) is marked with the letters RB
and 'FRONT' Ensure the correct sprocket is
used and the 'FRONT' text is facing forwards
when installed.
Figure 6A1 – 150
12 Place the left-hand secondary timing chain around the left-hand camshaft intermediate driveshaft inner
sprocket, with the bright plated timing chain link (1)
aligned with the access hole (2) in the outer sprocket.

Figure 6A1 – 151

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ISUZU KB P190 2007