I know this thread is old but it’s a good one.
Recently did a complete water pump kit in my
87′ Mariner 50HP for the first time after
owning this boat for 5 years.
Found this thread after the job was done, but
didn’t encounter any problems other than needing
my brother to help me re-install the LU.
Old impeller showed considerable wear and distortion,
as well as one paddle (under my index finger) almost broken off.
I know this thread will help other first timers learn
and save some cash so I’m giving it a bump.