engine ISUZU KB P190 2007 Workshop Repair Manual

Engine Mechanical – V6 Page 6A1–118
Page 6A1–118
Primary Timing Chain
1 Remove the right-hand secondary timing chain, refer to Right-hand Secondary Timing Chain in this Section.
2 Remove the two primary 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 – 114
3 Remove the gasket (1) from the tensioner (2) and discard the gasket.
4 Inspect the primary timi ng chain tensioner mounting
surface on the engine block for burrs or any defects
that would affect the s ealing of a new tensioner
gasket.


Figure 6A1 – 115
5 Remove the two primary timing chain upper guide bolts (1) and remove the guide (2).


Figure 6A1 – 116

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–119
Page 6A1–119
NOTE
Do not remove the primary timing chain lower
guide (1). The primary timing chain lower guide
is not serviced separately. If the primary timing
chain lower guide requires replacement, the oil
pump assembly (2) must be replaced.


Figure 6A1 – 117
6 Remove the primary timing chain (1). NOTE
For ease of removal, remove the chain from the
crankshaft sprocket, bef ore attempting to
remove from the camshaft intermediate
sprockets.


Figure 6A1 – 118
7 If required, remove the right-hand camshaft intermediate sprocket bolt (1) and remove the
sprocket (2).

Figure 6A1 – 119

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–120
Page 6A1–120
8 If required, remove the crankshaft sprocket (1) from
the crankshaft (2).

Figure 6A1 – 120
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 – 121
3 Remove the gasket (1) from the tensioner (2) and discard the gasket.
4 Inspect the tensioner m ounting surface on the left-
hand cylinder head for burrs or any defects that would
affect the sealing of a new tensioner gasket.


Figure 6A1 – 122

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–121
Page 6A1–121
5 Remove the left-hand secondary timing chain shoe
bolt (1).


Figure 6A1 – 123
6 Remove the left-hand secondary timing chain shoe (1).


Figure 6A1 – 124
7 Remove the left-hand secondary timing chain guide bolt (1), two places, and remove the guide (2).
Figure 6A1 – 125

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–122
Page 6A1–122
8 Remove the left-hand secondary timing chain (1) from
the camshaft position actuators (2) and the camshaft
intermediate sprocket.

Figure 6A1 – 126
9 If required, remove the left-hand camshaft intermediate sprocket bolt (1) and remove the
sprocket (2).

Figure 6A1 – 127
10 Remove Tool No. EN 46105–2 (1) from the left-hand cylinder head camshafts (2).

Figure 6A1 – 128

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–123
Page 6A1–123
11 Remove Tool No. EN 46105–1 (1) from the right-hand
cylinder head camshafts (2).

Figure 6A1 – 129
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 6A1–124
Page 6A1–124
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 – 130
Camshaft Intermediate Sprockets

Figure 6A1 – 131

1 Inspect the camshaft intermediate sprockets for the following:
• Damage to the primary and secondary timing chai n sprocket (1), refer to Figure 6A1 – 129.
• Damage to the hub bearing (2). Ensure the hub bearing sp ins freely. If the hub bearing wobbles, is noisy or
feels rough when rotated replace t he camshaft intermediate sprocket, and
• Damage to the bolt flange seating / sealing surface (3).
• Damage to the bearing hub-to-engi ne 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 6A1–125
Page 6A1–125
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 – 132
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 – 133
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 – 134

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–126
Page 6A1–126
Primary Timing Chain Tensioner

Figure 6A1 – 135
1 Inspect the primary timing chain tensioner for wo rn 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 tens ioner 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 – 136

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ISUZU KB P190 2007

Engine Mechanical – V6 Page 6A1–127
Page 6A1–127
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 – 137
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 – 138
Left-hand Secondary Timing Chain Tensioner

Figure 6A1 – 139
1 Inspect the left-hand secondary timing chain tensioner fo r damaged plunger-to-shoe contact surface (1), refer to
Figure 6A1 – 137.

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ISUZU KB P190 2007