I'm glad I found a group devoted to my favorite past time. I think my gf was getting very tired of hearing about the boats.
I read through the seloc manual and decided that I had the knowledge to rebuild my 12JC. So far that remains to be seen.
I got it all apart; the old impeller was in bad shape and was grinding into the wear ring. I'm pretty sure the shaft was bent. I had another 12JE with a new impeller and good shaft. I ordered a B overhaul kit and replaced the ring, bearing, seals and packing rings. With no shims the impeller grinds. With four shims the impeller turns smooth in 3/4 of a turn and rubs lightly on 1/4.
I figured that once the bowl was installed it would center the shaft and it wouldn't rub. However once the bowl is torqued it completely locks up the shaft and it won't turn. It doesn't look like the impeller is rubbing on the bowl but I can't say for sure.
I really appreciate any suggestions you guys have