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Hello mechanics-a question about self-extracting bolts(4 posts)

Hello mechanics-a question about self-extracting boltsG
Aug 3, 2001 11:07 AM
OK-I've pulled off the cranks on both my mountain and road bike numerous times for routine servicing and bottom bracket repairs, but something I can never figure out is a decent way to grease those self-extracting bolts except to take them out, grease them and then put everything back together. Am I missing something(like an easier solution) or is this just the way to do it? Thanks.
Answer about self-extracting boltsgrzy mnky
Aug 3, 2001 12:37 PM
Put the dab of grease on the female threads of the BB. Turning the bolts will distrubute the grease. You can also get that dab on the end of the bolt even though it's still captive in the crank arm and then reassmeble. You don't have to wipe the grease into each individual thread to be effective, but you can if you want. Some folks use a throw-away acid brush to applu the grease. Whatever floats your boat.
A slightly different answerMike Prince
Aug 3, 2001 3:01 PM
Grzy Mnky's answer will get the threads of the bolt taken care of, but if you are asking about the "internals", i.e. the shoulder of the bolt, plastic washer and inner cap surfaces, I don't think there's a way to get grease on here without using a pin spanner to get the dustcap ring off and access the internal surfaces of the bolt assembly.

Having said that, this shouldn't need attention too often as the only time these surfaces move is when you are turning the bolts. In other words, they are not like a bearing assembly where there is constant rotation (hubs, bb). However, for peace of mind I apply a thin coating of grease to the above mentioned parts anytime I remove the bolts, which is infrequent (only 1-2 times a year at most). Under normal use I do not use the self-extraction feature, but wouldn't want it to not work if I had a problem far from the house.
re: Thanks guysG
Aug 3, 2001 5:52 PM
That is what I thought. Last time I replaced the bottom bracket on my MTB, I greased the threads on the bottom bracket becaused it seemed easier. I was concerned if I was getting enough grease on the entire bolt that way. Thanks for the peace of mind.