Imperial Mac
New member
I recently loosened all of the nuts and bolts of the lower unit to the upper unit on a 1977 120 hp Mercruiser without putting it in forward gear. I did not remove the entire outdrive form the boat. Now, the lower unit is separated from upper unit by about a half an inch, but it will not separate any further. It seems it is catching on something. I just wanted to inspect and replace any water pump (impeller). Thank you in advance.