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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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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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2.Cracked back surface
rubber. 3.Cracked or separated
canvas. 4.Cracked tooth
bottom. 5.Cracked side.
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6.Abnormal wear on
side.
note |
Normal belt should have
clear-cut sides as if cut by a sharp
knife.
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7.Abnormal wear in
teeth.
Initial stage: Canvas on load
side tooth flank worn (Fluffy canvas fibers, rubber gone
and color 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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Turn the pulley. If it does not
rotate smoothly, or develops noise or excessive play,
replace the pulley.
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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. 3.Measure the extension length of
the rod. If it is not within the standard value range,
replace the auto-tensioner. Standard value:
11.7 - 12.3 mm
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4.Press the rod with a force
of 98 to 196 N and measure the amount of retraction. If the
measurement exceeds the standard value, replace the
auto-tensioner. Standard value: 1.0 mm or
less
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