Join Date: Dec 2012
Location: Lake Helen, Florida, USA
Crown wheel taper bearing...
Well, as it turns out, all is not as I had hoped. In a previous post I thought that the low speed wobble had gone away with the adjustment of the swing arm and FD pivot pins. Not the case. The 3 o'clock/9 o'clock wiggle test produced movement and a slight clunk.
I pulled the FD off today and opened it up. The crown wheel bearing appears to be okay (19 balls). However the taper bearing shows evidence of the inner race spinning on the spindle. The taper bearing slid off using just my fingers. The bearing isn't so loose that it wobbles on the spindle. The I.D. of the bearing is 25.00mm and the spindle is 24.95mm.
The spacer (shim) for the taper bearing has a step cut into it. I assume that that is from the bearings inner race wearing on it as it spun. The thicker step mics at 2.65mm. It is evident that 2.65mm was the original thickness because there is a remnant of dye that identified the thickness of the shim still stamped on it. The worn surface is 2.50mm. I assume that the worn spacer (shim) has caused the taper bearing to lose its preload. Thus the movement and clunk.
My question to those of you in the know is...can I replace the worn shim with a new one that is the original thickness and be okay? Can I locktite the bearing to the spindle with a difference of .05mm between the two?
While I had the FD apart I checked the shims for the CW bearing. There are three. The total thickness for the three is .57mm.
I would greatly appreciate any and all advice from you guys that are in the know about these matters. Thanks.
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Last edited by FatStrat; Apr 22nd, 2014 at 5:06 pm.