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Usually it's not trivial to find out that valves have to be replaced. Some common cases are: timing belt was broken and valves were bent, one or more valves where burn or have mechanical defect. The best way is just to look at valves, it might involve removal of cylinder head unless you have a optical fiber which allows to look in combustion chambers without opening it.

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Q: How do you know when your car valves need replacing?
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