Saturday, September 24, 2011

Wheel assembled

Finally got the wheel back together with new bearings and the rest. The bearing work was the usual ice box and torch exercise. It is a pain as the Mondial has a captive axle, and that axle press fits on the bearing. So what I did was:

  • put one bearing in the hub by freezing the bearing and torching the hub
  • freeze the axle and then put a bearing on the axle (on the opposite end of the axle from the one already in the hub! - this is an asymmetric axle)  And no torch on the bearing! I used my long pipe bearing driver over the axle on the inner race of the bearing.
  • Now freeze the axle and bearing assembly. Heat the hub and drop the axle with bearing through the hub and feed the axle into the bearing on the far side. Use my large bearing driver pipe over the axle on the outer race of the bearing on the axle.
  • Quickly flip the wheel over and reseat the bearing on that side, as it was pushed partially out. Flip the wheel back over a couple times tapping the bearing on each side of the wheel to be sure both sides are fully seated.
Complicated, and there is no way I know of to put these bearings in without stressing them some, due to the captive axle, and the fact the axle press fits into the bearings.

This video: here is somewhat helpful, but doesn't deal with the captive axle issue. But it shows a sensible (IMO) light heating of the hub.

Searched everywhere nearby for "cush" drive springs, and found some things that I could make fit... but didn't trust them. These springs will get hammered with every shift, braking and acceleration and I just didn't feel that using regular hardware store springs as a replacement. Ended up putting the old ones back in, figuring it's no worse than when I started... And I'll search for proper replacement springs in the coming week!
Here's a pic of the hub with new bearings and the old springs inserted. And some dabs of grease to help the sprocket "cush" smoothly:

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