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Discussion in 'Trials' started by motobene, Oct 14, 2013.
You mean im not supposed to use screwdrivers?
I generally don't get around to it until the slop is driving me nuts, or the bearing feels crunchy and hard to turn. I suppose that the clean and repack would extend the life.
I have always cleaned and repacked my bicycle bearings. The older ones are loose bearings in adjustable cones and races. You pack those pretty full of grease. But, there are plenty of gaps for the grease to disperse if you overdo it.
MB- " and use air to blow out the crap".The problem I see with that is that you are not blowing out the crap,you are blowing IN the crap.You are blowing all the old grease and solvent into the inside of the hub [unless you have a way of getting inside the hub and blowing out]. If you have old grease and solvent washing around in there it will contaminate the new grease you put in the bearings.Unless you are blowing it through the bearing and out the other side of the hub? That would be tough to do with another bearing in the way. It seems then that there would be considerable contamination left in the bearings.So then you have not gained much.Any slop,noise or any other aberration is reason enough to change them-do you want to save 20 bucks on bearings and then ruin your hub?
For me, the easy answer is to simply pop in a new chi-com bearing, at $1.67 each. With my new bearing puller making the job so easy, I will replace at first sign of water intrusion. I'll let you know if they trash my hub, but I am going to watch them closely for awhile.
Regarding blowing crappy grease out of bearings, I assume you all are competent enough to figure out how to do that well.
I too used to assume RPM was a limiting factor to solid packing motor bearings and idler bearings on serpentine belts and other applications, nothing ever blew up, and I stopped replacing bearings on very high miles and hours machines. Problems with solid packing roller bearings in our real-world applications at modest rpms? Problems for me? Zero. Benefits, many.
It's been my experience that there is an endless supply of 'specialists' who will tell you can't do something or that you should do some very specific, narrow thing because, well, they are the experts. It has profited me greatly in life to question them and find out for myself.
Not real sure if it is about competency? Just asked what you did about the old grease and solvent that you blow into the hub and that is waiting to contaminate the new grease.You would need to pull a bearing to get in there and clean the old stuff out.Then you would need a new bearing anyway.That is and was my point.
I got your point. In making it you refuted what I said. Now I realize you were objecting based on your assumption that there is no inside seal on the wheel bearings. On the moderns there are... on all the bearings. Thus no blowing crap 'into the hub'... if the suggested trick is done competently.
Good point. I was taught to fill them up 40 years ago, but if a current crop of specialists is telling me to save the time, effort, expense, and possible damage, I will stop doing that and see for myself if that will cause problems.
It sure seems easier to change them out vs the cleaning mess for $1.67, even at my level of competency. ;-)
Go for it.