Isuzu KB P190. Manual — part 725
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.
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 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
.
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
.
N O T E
The primary timing chain lower guide is not
serviced separately and is part of the oil pump
assembly.
Figure 6A1 – 134
Engine Mechanical – V6
Page 6A1–126
Page 6A1–126
Primary Timing Chain Tensioner
Figure 6A1 – 135
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.
N O T E
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 – 136
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