Assume I have a couple of closed bearings on some pivots on my bicycle.
- are fitted on a housing
- have an axle going through them
- are tightened by bolts which also have cups to "protect" the black plastic part of the closed bearing
My question is, would you use grease between that black plastic part and the axle cup to protect the bearing from water and dust? I'm talking about a lot of waterproof grease which upon bolt tightening will overflow. Of course I will wipe out any excess after tightening.
I'm asking because even if the bearings are of high quality, I will sometimes find that dust or other small particles have entered its inside area making the bearing lose its smoothness and eventually making it wear faster. So, could that extra grease on the outside act as protection?
Edit: This question doesn't regard greasing inside the bearing. I'm asking whether puting grease on the bearing, covering the metal and the black part, will prevent water and dust from entering.