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Because the water pump on the duramax is gear driven,when you install a new water pump that meshes with an exisiting drive gear you get a noise coming from that area. The new gear on the water pump will have to wear into the existing drive gear. It would be the same if you installed a new ring gear in a differential but left the old pinion gear,you would have a similar noise. It took my dealer changing a brand new pump because it made noise to figure out that the pump was fine it just needed to break in. Hope this helps.

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Q: Water pump and belt replaced on a 2003 Chevy duramax now timing chain noise?
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