Merc 15hp outboard - bearing carrier stuck - lower unit won't drop
I recently bought a new to me dinghy and a low hour 2005 Merc 15hp 2 stroke outdrive. It also appears the previous owner did little to no maintenance. I discovered the prop shaft seals were leaking so I'm trying to replace them and running into challenges. I'm trying to remove the bearing carrier with the appropriate merc tool (reverse threaded) and that darn thing won't budge. I have it soaking in PB Blaster now and may have to try heat. Any recommendations on removal?
Right now I left the lower unit attached but my manual shows removing it. I think it only shows removing it because it is showing how to do a complete tear down of the lower unit. So my question is there any reason to remove the lower unit to simply replace the prop shaft seals? Before I really apply the elbow grease I want to make sure I'm not going to break something internal because I should have removed the whole lower unit.