That doesn't look all that bad to me. Run your finger nail over the discolored areas; if there's no raised surface or if it's slight, you're fine. Use some 0000 steel wool to restore the uniformity of the curvature, make sure all residue is rinsed or wiped away. Wouldn't hurt to finish off with a bit of metal polish.
As long as the hardened bearing surface is not compromised and true circularity in intact in all planes you should be OK.
I've done this on multiple occasions. No need to contemplate discarding a BB unless you have more severe evidence than this. On the other hand I agree that the Sakae is unlikely to be Swiss (or French), may not be original and may not be all that expensive to replace.
J
Originally Posted by
old's'cool
I finally got around to overhauling the BB on my Grand Jubilé yesterday. After cleaning, I noticed some corrosion marks on the both cups. The drive side grease was still in good condition, the NDS grease was black and sticky, like glue, and there was little or none in the bearing. Here is a photo of the corrosion. Since it wasn't exhibiting any symptoms when riding, I went ahead and reassembled the BB with fresh grease. Based the appearance of the cup, should I be looking for a replacement cup or complete BB?
Related question, I'm not schooled in identifying the thread types, since everything else on the bike seems to be English threaded, I assume the BB is also, can anyone tell from the second photo - it does clearly show that the threads on the two cups are opposite? It is a Sakae, BTW. Thanks for any assistance!
