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Yes, they have to be changed along with the timing belt. The tensioner pulley doesn't last very long (only as long as the timing belt, or not as long as two timing belts, at any rate) and the water pump is cheap enough anyway. If one of these things decide to break, it will also break your timing belt, which will damage you engine in the most expensive ways. ...


4

It's not necessary, but VERY recommendable to change all the related things. I had often enough, that the old water pump got leak after change of timing belt because of different tension. You may be lucky, and nothing will happen. But if, you will have to pay almost the same high price just to change only a water pump, tensioning roller, guide pulley or ...



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