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Vernier calipers |
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Timing chain |
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Sprocket |
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| Sprocket wear occurs between the teeth of the
sprocket. |
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| Sprocket wear causes the chain to rest too deeply
on the sprocket, reducing the outside diameter of the chain when it is mounted
over the sprocket. |
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| Therefore, mount the chain over the sprocket and
then measure the outside diameter of the chain to judge whether the sprocket is
normal. |
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| Allowing the sprocket wear to progress may cause
tooth missing or tooth skipping due to the loose chain, which may result in damage
to the valve mechanism. |
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