On many of my pre. WW-II, no seal, gear cases, I’ll put enough O
rings on the prop shaft that the prop will hold them against the prop
shaft bushing. Once the prop touches the O ring (rings) I’ll tighten
the prop nut 1 face or just far enough so I can get the shear pin in.
The grease lubricates them so they last longer than you’d think.
How effective is this? I like to think it is but its really hard to tell
how much as your still passing grease through the drive shaft bushing.
I’ll run a motor for week at a time and try to judge, by tanks of gas
used, when to pull the motor, drain the water, and add more grease.
When I’m done using the motor I remove the remaining grease.
If you refill the gear case it will drip. I attach a note that there is no
grease in the gear case.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.