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Problem installing BB cup

Old 03-24-12, 12:48 PM
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Problem installing BB cup

I'm having trouble screwing in the non-driver side cup. I get it in about 1/4 of an inch and then it gets stuck. The threading matching and I'm turning the cup clockwise. The threads don't seem to be striped and I don't want to force it in. Any ideas on what could be the problem?
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Old 03-24-12, 01:21 PM
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BB threads might need to be chased. you can always grease the cup threads well and the BB threads and give it another go. give it a little extra pressure and see if it'll take - if not don't force it. take it to the LBS and get the threads chased.
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Old 03-24-12, 01:36 PM
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Is this a cup/cone style BB or a cartridge?

Either way, you might start by checking the threads alone, by threading the cup in with the spindle or cartridge in place. Note where it gets stiff, and visually check the threads at that depth for a ding, or piece of imbedded grit. If it looks OK except for a dinged thread or two, you can chase it with a STEEL cup (do not attempt with an aluminum cup) by oiling it well and forcing it in a bit deeper (maybe a turn or so) until the resistance gets higher, backing out and going back in a bit more, and "woodpeckering" it in this way back and forth until past the depth you'll need.

Cartridge BBs have a different issue. Sometimes the right and left side threads aren't perfectly aligned with each other, and the cartridge is pushed slightly to one side by the first cup. The second cup then jams trying to bend the cartridge back to line. Often this can be cheated and the BB installed if the right cup is left loose, so there's some float until the left is installed to close to final depth. Then tighten the right fully, and come back and finish with the left as per usual. In some more extreme cases you can do install by bringing both cups in by degrees one at a time, letting the cartridge float to make up the error, until nearly done, then tighten the right and finish with the left.
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Old 03-24-12, 02:13 PM
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It also could be as simple as a chunk of dirt in the threads. You might want to clean the male and female threads with a wire brush, hopefully to knock the offending material away.
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Old 03-24-12, 02:22 PM
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Originally Posted by MudPie
It also could be as simple as a chunk of dirt in the threads. You might want to clean the male and female threads with a wire brush, hopefully to knock the offending material away.
That is always a good idea. At one shop I worked at we had a few homemade chasers for times like this. just some old steel cups with some flats ground into the threads. they usually did a decent job if the threads were just real dirty.
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Old 03-24-12, 03:18 PM
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Thanks for the help. The threads were damaged so I took it to my LBS and they tapped it.
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Old 03-24-12, 05:31 PM
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i have a wire brush(plumbing section and get a brush for copper pipe) that i chuck in the drill to clean out bottom brackets. can also use it to clean out the fixed cup, wrap the rag around the brush
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