I had an older Master Craft (1991) with the same issue. The dealer at the time said it had to be pressed in, so I had them do it. Hinsight I would try it myself or replace the whole thing. It sat at the dealer for several weeks. I'd suggest contacting the dealer and ask them to send you a new one. This is what I saw on Master Craft Parts.com.Raw Water Pump Assembly. Part #MV8V-1072. For All Open Cooled Engines Except 7.4L. Ilmore seems very proprietary, but if there's a number you might find a kit, or at least cheaper. Good luck.