I'm in the process of assembling my 1973 "Box O Piner" and being kinda hard up for parts and all...
Anyway, the front wheel bearings have this spacer tube thats threaded on one end to hold the brake drum snug, and threaded on the other end to hold the speedo sending unit.
Well the speedo unit re engineered the threads and there trashed.
I assembled the whole mess less the speedo unit and the nut and all seems kosher. Anybody know what that nut on the speedo end does other than hold the sending unit snug against the spacers ??
The manual shows a bushing in place of the sending unit, and I suspect the snap ring may need some help keeping that speedo side bearing in place. Thus the nut ??
Raymond
Down East Pentons
Raymond: The Europeans seemed to like locking the inner bearing races, brake hub and in your case speedo drive together. Then the axle locked the whole assembly to the forks. The Japanese use just the axle, and it works fine. Problem is our Pentons, Puchs etc are supposed to be the other way. If you leave the speedo drive off, there is no pressure exerted on the inner race of that side wheel bearing. This is due to the axle, fork leg etc are pinching the tube spacer but not the race. What could happen would be the inner race could start spinning on the tube spacer and wear the spacer. I don't think the bearing can come out due to snap ring but you could make a spacer where speedo drive was and make it long enough to just come past end of tube spacer. Just a few thousnadths of an inch. That way when you tighten the axle it will push against bearing race, which touches inner raised section of tube spacer, that contacts other side inner race and so on. The idea is that both inner races are pinched tightly between brake drum, spacers and ultimately fork legs. Hope this makes sense. Ted
Thanks Ted and yes it does make sense ! I'm gonna use your suggestion cause it makes sense to put some load on the inner race. This should give some radial support to the inner bearing race and lightened up that stress on the snap ring too.
Raymond
Down East Pentons