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The timing belts must be checked
closely. Should the following defects be evident, replace
the belt with a new one.
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![](../../../img/11/AK202794AA00ENG.png)
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1.Hardened back surface
rubber. Glossy, non-elastic, and so hard that no mark is
produced even when scratched by fingernails.
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![](../../../img/11/AK202793AB00ENG.png)
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2.Cracked back surface
rubber. 3.Cracked or separated
canvas. 4.Cracked tooth
bottom. 5.Cracked side.
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![](../../../img/11/AK202795AB00ENG.png)
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6.Abnormal wear on
side.
note |
Normal belt should have
clear-cut sides as if cut by a sharp
knife.
|
|
![](../../../img/11/AK202796AB00ENG.png)
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7.Abnormal wear in
teeth.
Initial stage: Canvas on load
side tooth flank worn (Fluffy canvas fibres, rubber gone
and colour changed to white, and unclear canvas
texture) Last stage: Canvas on load side tooth
flank worn down and rubber exposed (tooth width
reduced)
8.Missing tooth.
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|
1.Check the auto-tensioner
for leaks from the sealed sections. Replace it if
leaky.
|
|
2.Check the rod end for wear
and other damage. Replace the auto-tensioner if the rod
is badly worn or damaged.
|
![](../../../img/11/AK500737AB00ENG.png)
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3.Measure the extension
length of the rod. If it is not within the standard value
range, replace the auto-tensioner. Standard
value: 14.5 mm 4.Measure the amount of the
retraction when the rod is pressed with the force of 100
- 200 N. If it deviates from the standard value,
replace the auto-tensioner. Standard value:
Less than 1 mm
|
|
When the auto-tensioner is not kept
with its rod upward, or when a wire or pin having Φ2
mm is pulled out before the installation to the engine,
carry out the air bleeding as follows.
|
![](../../../img/11/AK801061AB00ENG.png)
|
1.
caution |
- If a horizontal press such as a vice is
used, the air entrainment may occur.
Thus, a vertical press must be
used.
- If the compression is too fast, the
procedure may damage the rod. Make sure
to compress slowly and
thoroughly.
- To prevent damage to the auto-tensioner,
do not apply the load of 5,000 N or
more.
- To prevent a damage to the auto
tensioner, do not push down the rod
exceeding the bottom end (a position
where the rod protrusion is at 0.5 mm
from the auto tensioner).
|
Set the auto-tensioner to a vertical press as shown
in the illustration. 2.Slowly press down the rod,
two or three times, to the cylinder end
plane. 3.When the rod protrusion has approximately
5 mm, apply the load of 100 - 200 N. Check whether the
auto-tensioner has sufficient stiffness. 4.If the
auto-tensioner does not have sufficient stiffness, replace
the auto-tensioner. 5.Slowly pressing down the
rod, insert a wire or pin having Φ2mm through the hole
to fix the auto-tensioner.
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