ISUZU KB P190 2007 Workshop Repair Manual

Engine Mechanical – V6 Page 6A1–102

8 If required, remove the crankshaft sprocket (1) from
the crankshaft (2).
Figure 6A1 – 118
Left-hand Secondary Timing Chain
1 Remove the primary timing chain, refer to Primary Timing Chain in this Section.
2 Remove the two left-hand secondary timing chain tensioner bolts (1) and remove the tensioner (2).


NOTE
Take care when removing the tensioner bolts.
The tensioner plunger is subjected to spring
tension and may spring apart during tensioner
removal.

Figure 6A1 – 119
3 Remove the gasket (1) from the tensioner (2) and discard the gasket.
4 Inspect the tensioner mounting surface on the left- hand cylinder head for burrs or any defects that would
affect the sealing of a new tensioner gasket.

Figure 6A1 – 120

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–103

5 Remove the left-hand secondary timing chain shoe
bolt (1).

Figure 6A1 – 121
6 Remove the left-hand secondary timing chain shoe (1).

Figure 6A1 – 122
7 Remove the left-hand secondary timing chain guide bolt (1), two places, and remove the guide (2).
Figure 6A1 – 123

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–104

8 Remove the left-hand secondary timing chain (1) from
the camshaft position actuators (2) and the camshaft
intermediate driveshaft sprocket.

Figure 6A1 – 124
9 If required, remove the left-hand camshaft intermediate driveshaft sprocket bolt (1) and remove
the sprocket (2).
Figure 6A1 – 125
10 Remove Tool No. EN 46105-2 (1) from the left-hand cylinder head camshafts (2).
Figure 6A1 – 126

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–105

11 Remove Tool No. EN 46105-1 (1) from the right-hand
cylinder head camshafts (2).
Figure 6A1 – 127
Clean
1 Clean all the following components with a suitable solvent:
• crankshaft sprocket,
• primary timing chain,
• primary timing chain guide,
• primary timing chain tensioner,
• secondary timing chains,
• secondary timing chain shoes,
• secondary timing chain guides,
• secondary timing chain tensioners, and
• bolts.

Safety glasses must be worn when using
compressed air.
2 Dry all the components with compressed air.

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ISUZU KB P190 2007

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