Okay I'll be honest about what I did. This was back in Sept and I really didn't know any differant, I put on my harmonic balancer on my new motor with the help of a hammer. I was very gentle, okay I wasn't gentle. /forums/images/graemlins/eek.gif I've been searching on here and I'm thinkin that maybe I've messed up the thruster bearing(s) on the crankshaft?? How hard is it to replace a thrust bearing? The engine knocks and it sounds like it is coming from the very front. I know now for sure that I'll need a new balancer, but I'm worried now that I'll need a new crankshaft. Is that a job that means pulling the whole motor out? Sorry for all the questions just don't know what to do anymore.