quite possible, on a MCP600 the impeller sleeve will wear instantaneously -> rattle
'do not run dry' is not on these pumps by accident
unless the pump has a mechanical seal on the shaft, they all require pressure in the pump head to force the coolant/lubricant 'back' around the impeller and out at the pump inlet to lubricate the shaft, or ball
you're a better man than I, I'm unable to deal with the general public on an ongoing basis
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