Within the last month I posted a problem that had developed with my '73 Raleigh Sports. There was a "chirping noise" coming from what I thought was the bottom bracket. I never head the noise when coasting; only when turning the cranks. The force applied to the pedals didn't seem to matter. Anyhow, many thanks to all who responded. Here is how it now stands:
1. Removed pedals, cleaned and lubed them thoroughly. Still chirping.
2. Checked the cotters and eventually removed them successfully. Cleaned and replaced them. Still chirping. (By the way, whoever suggested removing/reinstalling cotters using the combination of a socket from and socket wrench set and a C-clamp is a genius. It really works great!)
3. Re-built the bottom bracket. Saw nothing particularly unusual when I tore it down. Upon my "test ride", I initially heard nothing, but after the first mile or so, the chirping reappeared although it definitely was not as loud as before.
I don't know if what I'm abouit to report is related to this problem or not, but something else might be a clue. This bicycle has a Sturmey-Archer 53C rear hub (3-speeds and coaster brake). When I back the bicycle up, I feel a small amount of binding in the rear of the bike every revolution. In addition, every so ofter a "clickety, clickety, clickety" sound comes from the rear hub. If I hit a bump, it usually disappears.
This is becoming like a CSI case.