Impersonating a mechanic
Join Date: Mar 2010
Location: Kennett Square, PA/Sun Valley, ID
Year: 1982 & 1985
Model: 82 GL1100-I PA/85 GL1200-A ID
Looks to me like the o-ring (red arrow) is redundant. The oil pump seal and another o-ring at the front of the pump keep oil out of the void.
Edit; thinking on it more, remembering more, that o-ring does also keep oil out of the void.
According to the procedure for water pump replacement on Goldwing Docs, which I just reviewed, the smaller of the two o-rings ie, the hindmost ring, keeps the oil out, and the larger one keeps water out of the cavity. So your edit is correct.
And I thank you all again for your help. We're heading back to Pennsylvania tomorrow, but will be back to this bike in mid-August.
In the meantime, I'll be looking for o-ring/seal kits, just in case I mashed one (or more), when I replaced the water pump two years ago. I already have new front cover and water pump gaskets. Any suggestions for sources would be welcome
82 GL1100-I -- PA
85 GL1200-A -- ID