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I ran across the same problem when I installed a new shaft with impeller already pressed on in my B wp.The pump was about 3/8" short of meeting the head.I had to remove the repro impeller & install the old one,then it fit OK.The front of the new one was not machined deep enough.One more instance of crappy repro parts.I also drilled a 3/32" hole thru the imp & shaft & installed a roll pin.Sometimes when an imp is reused,they will not fit quite as tight as they should.If the imp was to come loose,the fan could propel itself into the rad.