Here is the page from svc manual, thanks to Jim (pugetsoundboater)
The manual actually shows pulling the driveshaft out making impeller installation easier. Though the instructions are clear, and correct, it is easy to get confused by terminology and depending on how you are looking at the driveshaft.
This same key design was used on the larger engines as well. Needless to say, you can’t just pull the driveshaft out making impeller/key installation easier.
