Reply To: 1958 10 hp Johnson Mysteries

[Don]

Those gearcase dowel pins aren’t actually missing, they just got pressed flush into the casting when someone (previous owner) misaligned the hole in the bearing and assembled the gearcase.

That impeller housing “spacer” helps seal the impeller housing by holding a certain amount of water in that tube when running, and keeping exhaust pressure away from this area.  Once the spacer/orings are in place, you will notice water spilling out of the exhaust housing around the driveshaft tube near the gearcase when the engine is running, this is perfectly normal.