This problem pops up on the forums now and then, usually attributed to worn accessory bushings. The car I am dealing with, second case in fact, the water pump round piece to which the pulley attaches with the four bolts, has somehow "traveled" about quarter of an inch back thus causing the water pump pulley to rub against the timing belt cover and unwanted obvious misalignment. This piece should be pressed on and it's hard to imagine how it would move back like that, but there it is... marks and all. The pump in question is OEM Volvo, the second case a Hepu.
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