I have removed lower unit and replaced water pump numerous times, until yesterday, (1999 original owner, salt water use, lobster boat, 2000+ hours use) removed 5 nuts, tapped lower down, very reluctant to move, noticed aluminum oxide particles, (corrosion particles) falling out, tapped lower unit, down below studs, 5 inches or so, and hung up.... I can move unit back up and then slide down by but snags on drive shaft (shift shaft completely disengaged and fine, water pump outlet pipe well clear, DO I NEED TO LIFT POWER HEAD TO FIND THE CAUSE OF HANG UP? Any ideas??

