good advice from shaun, if its been in salt water it can be a pain to get off, i have removed some of the most stubborn by using a large hyd. press if you have one, remove clip ring on main bearing and packing follower and etc. stand pump up in press support properly and press shaft and imp. out of pump. invert imp and shaft in press and press shaft out of imp. much easier on shaft than prying to beat it out or damage it from trying to cut imp off. ggod luck pm if i can help