Thank you so much Steen, I didn’t realize they were dissimilar metals. I did not heat the case to remove the bearing and just tapped it out gently with hammer and bearing remover, could that have caused this? It is a SwedeTech motor and I emailed them about what happened and what to do but I am currently waiting on a response from them. Would heating just the sleeve area with a torch work, or does it have to be an oven? I was only replacing the Main bearing and don’t want to cook the current bearings for the trans shafts. One company I spoke with recommended just replacing the case but the $1000 for a case is my entire yearly racing budget so I need to keep things affordable.