‘36 Bottom bracket replacement

[57 spit]

I think it’s time to replace the bottom bracket on this bike. There is a slippage when I pedal and there’s a ton of wear inside. Not a worn chain or cog. Could it actually be something in the rear hub?
The crank is stamped WALD. 1936 or 37. Does anyone know how to identify the proper size of the parts? Cups are pitted and gouged. I replaced some bearings a few years ago, but it’s gotten worse again.

 

[bloo]

What is the bike?

Yes, that looks pretty screwed up but there is really no way for it to "slip" because the little drive dog engages the chainwheel positively. Is the chain tight? I think you should fix it, even though it can't be the slipping.

If you are looking for exact factory matching stuff, it will probably have to come from the same kind of bike or at least similar. I am assuming that is a 24tpi crank. If so, a whole brand new BMX bottom bracket set would probably fit, as long as you used the whole deal. Individual parts probably wouldn't. To replace individual parts, it will need to be somewhat vintage.

In the old American standards from that period, 24tpi vs 28tpi made a big difference. Assuming 24tpi, the cups in the frame took a retainer that held 10 bearings. All the cups should interchange as long as the outside diameter is the same, and most are. Huffy used cups like through at least 1980, and probably a lot later. So did nearly all other American bikes with one piece cranks of that era as long as they weren't 28tpi Schwinns. From the prewar era, even Schwinn cups would probably fit. If the OD is wrong, you will have to find some cups for your particular make and model.

The bearing retainers, assuming 10 balls, interchange with non-Schwinn one piece crank bearings up to 1980 and beyond, and also prewar Schwinn. They don't seem to be that common now as new parts, but up through the 80s, it was the most common bearing. If your old retainers aren't shot, just pop new balls in.

The cones, assuming 24tpi, interchange with all 24tpi American ones up to the 80s or so. There are different styles on the outside with different looks, some use a separate dust shield under the nut, some do not, etc.

If it is a 28tpi crank, the cones have to come from a prewar Schwinn to fit without changing anything else. Postwar Schwinn cones are for a smaller 9 bearing retainer and a different cup, so do not fit quite right by themselves. The OD of the cups is the same as a standard non-Schwinn though so the whole postwar Schwinn setup usually fits as long as you change everything.

Slipping must be in the rear hub. I would tear it down and clean it out. Maybe you can see damage, but it's probably just all gummed up.

 

[57 spit]

Thanks bloo. I think you’re right about the rear hub. I remember there was a transfer spring that I replaced a while back. The bike is a DP Harris I put a Rollfast badge on. It’s my preferred daily rider.

 

[Archie Sturmer]

The crank set may likely have been swapped out previously. I believe that Wald used mostly 24-tpi coarse threads like those shown in the 2nd picture.
The R-L stampings on the cones are also Wald indicators. Most likely an American standard 24-tpi bottom bracket bearing set should suffice. Some advise against Wald bottom bracket bearing sets, so you might as well choose any other low-priced new set, instead of direct Wald replacements. On some of my bikes, I upgrade to the 12-bearing sets, (instead of 9 or 10 balls).

What is peculiar about that DPH chain ring sprocket, is that the metal in between the stamped hole patterns, is narrow about the crank shaft, so the flanged bearing cone hardware or spacer washer (if needed) might be more visible than with other sprockets.