What are the ways to reduce the noise of the chassis cooling fan?

The cooling fan in the chassis is getting bigger and bigger because the fan is worn due to the lack of bearing, the bearing hole is worn - the gap between the fan shaft and the bearing is too large and the fan's axial clearance is too large The fan can move a few millimeters before and after.

The fan in the rotation after the axial movement, and the rotation of the fan plane is also shaking, not only more and more wear and tear, and produce a lot of noise. The vast majority of fan failures are due to this. Although for a new fan of the most trouble, but one does not meet the spirit of thrifty, and secondly may not be able to immediately find the replacement model.
To solve the computer chassis cooling fan noise as follows:
1, first of all the dust on the fan clean, to avoid dust in the installation process into the bearing;
 
2, the bearing seal of the stickers tear off, remove the shaft of the card pin;
 
3, the residual oil within the bearing with a clean piece of paper or soft cloth clean, and then the shaft is also clean;
 
4, in the bearing to add a little butter, the principle is rather less to avoid serious impact on speed;
 
5, then the aluminum cans of the cans cut off the bearing as the outer diameter of the bearing as a large cut a wafer, and in the middle dig a just through the shaft of the hole, it will be padded between the bearing and the pin, Small bearing axial movement and parallel movement of the distance. If the gap is large, it is necessary to pad a few thicker Caixing, so that the bearing before and after the distance of 0.5mm or less.