Knowing the old Coronet hadn't seen a lot of maintenance in the last couple of decades I thought I might drain the fluid drive and refill. Crawled underneath and scraped at 50+ years of crud until I had the housing pretty well cleaned up. Where I expected to see a bolt for a cover plate I did find a hole (most likey a drain hole) and no identifiable cover plate. The housing vent looked like maybe it would come off and that would give me access to the plug. No luck, no bolts. Upon close examination it appears that the vent cover is spot welded to the fluid coupling housing.
Now, I might be able to access the plug through the vent opening but that could be a little messy and doesn't fully drain the coupling. I could roll the coupling on down to the drain hole after plug removal, but I'm afraid with all that fluid at once I'm looking at overwhelming the drain and the excess migrating to the clutch disc and contaminating it.
Anybody got any ideas.