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you do not have to replace anything you do not want to however if you do not want things to come apart prematurely it is wise to do so. bearings on components with high mileage most likely will not make the next change interval and hydraulic tensioners will loose tension it is also wise to replace the water pump if it is driven by the timing belt at this time as they also may not make the next change interval

I have seen all of the above fail inside of one year since timing belt replacement requiring the job to be redone

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Q: Do you have to replace your tensioner if your timing belt goes?
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