The manual has a decent write up, but basically press out shaft, remove seals, remove internal clips, press out or hammer out old bearing. A seal installer works well for this, press in new bearing, again seal installer works well for this, or a 2" od pipe. Bearing is 52mm od. You can hammer in if you only touch outside race, or wall. Works well to freeze brg and grease shaft and brg. Add clips back in, install motor side seal with lots of water proof grease, SS spring sticking towards motor. Press int shaft back in, to 19.5 to20.5mm through back of housing. Grease and install two seals facing firewall single lip first, double lip last, agian with springs facing firewall.