I just disassembled my transmission for an overhaul and restoration on my 1923 Touring. All looks exceptionally good, except I am a little uncertain about the crack/line evident in the brake drum. Am I looking at a casting issue that is no problem, or is this a structural issue that will compromise the integrity of the drum and needs to be replaced? Thanks for your help and guidance.
Eric- this is a clutch drum and what you want to look for are cracks on the band side.
Also, the area on the inside where the clutch discs ride needs to be smooth. Can't tell from your pics what the condition is there.
That almost looks to me like someone cut some oil grooves in that face to get more oil under the thrust washers. If it's not cracked through, I wouldn't worry about it. The lugs that fit into the clutch disks need to be smooth on the sides so the clutch disks can move in and out without catching.