"B Paton" <[email hidden]> schreef in bericht
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Quoted message said:A friend brought in an 80's vintage Breezer he would like to save.
Somewhere
in the mists of time someone managed to strip both cups of what appears to
be an 80's vintage Shimano sealed BB. It appears to have an aluminum cup
on
the drive side and the grey plastic cup on the ND side. There or no
splines
left anywhere. Both cups have been smoothed out completely. My friend
thought that the previous owner had applied some kind of thread lock,
leading to the stripped cups. I wonder whether someone simply turned them
the wrong way.
Anybody experienced something similar? I was thinking of trying to melt
the
plastic cup for starters, then hammer the axle through and do the rest
with
a hack saw. Think this might work?
Thanks,
Blake
First remove the plastik dustcaps, then remove the (plastik) ring that keeps
the bearing balls in place. do that on both sides. Roll all the balls down
on one side and up on the other side. put a pipe one the axle and puss down
on the side were the balls are upp. this takes a little force but the axle
will snap free and can be removed, so can the balls.
Now take a dremel with heavey duty cut-off wheels 24 mm across.
first cut all the way inside the "pipe" and cut the pipe into two pieces,
one that's 2 cm big, on the alluminium cup side and one that is automaticly
2,5 cm big.
The pipe is quit thick , about 3 mm . now cut a triangel out off the 2 cm
bit, remove this with a hammer and skrewdriver.
Cut the remaining bit in two or tree pieces. The steel is very hard and
brittle, so if the piece is too large to get out but you can turn it, smash
it with a well placed blow with your skrewdriver and hamer combination.
Is this done, you make a cut in the alluminium cup, alluminium doesn't
spark, so you now when to stop cutting ;-)
Remove the alluminium cup, using pliers.
now go to the plastik cup, cut some plastik away and start hitting the pipe
out to the otherside, change hitting places, eg first up then down ( best
you lay the bike down and support the bracket with some wood)
Now remove the plastic cup, make a cut with a hack saw and remove with a
pair off pliers.
I have done it myself today, so i know it can be done, and the bracket
threads are hardley damaged.
Good luck
Taeke (holland)
