Bearings help machines work smoothly and keep gears and machines that need bushings (with bearings in them) from wearing out too quickly. Bearings significantly reduce friction in working machines (with the help of a bit of oil and grease), thus reducing wear and tear--and reducing maintenance costs and times of repair.
If you are referring to an internal combustion engine they are also called the 'big ends'. These are the bearings on the crankshaft and connecting rods, the bearings on the other end of the connecting rods are the 'small ends'.
Generally, journal bearings have higher friction factor, consume higher energy and release more heat, but they have larger contact surface, so normally used in low speed high load applications.
yes
Here is a website that lets you put in the specifications of the bearign that you need and it will show you which to buy. from what I can tell, you will need one exactly like what you took out with the exact measurments. http://www.thefind.com/sports/browse-42mm-metric-ball-bearings
Generally, a ball bearing is used when speed is important; a roller bearing is used more often when load is most important.
Wheel bearings, main bearings, connecting rod bearings, cam bearings, axle bearings, carrier bearings, pinion bearings and so on, need to be more specific.
Wheel bearings? Axle bearings? Differential carrier bearings? Engine main bearings? Engine rod bearings? Engine cam bearings? Need more info to help you.
They come Krunk K2 bearings!
no
No, sealed bearings do not need to be greased as they are already lubricated and sealed to prevent dirt and debris from entering.
you need to buy bearings and bearing races most times they will come as a set you will also need axle seals and you will need bearing grease
Yes, any skate can take either bearing but you need to have the right type of wheel and spacer per bearing. ie, if you have mini bearings you need mini hub wheels and spacers that fit the mini bearings. If you have standard bearings you need standard hub wheels and spacers that fit the standard bearings.
We need to know which bearings you speak of, there are many.
Yes
To determine if the bicycle rear wheel bearings are loose and need adjustment or replacement, check for any play or wobbling in the wheel when it is spun. If there is noticeable movement, the bearings may need adjustment or replacement.
you don't they are sealed bearings. they will need pressed out of the hub to change them.
They are sealed bearings which need to be pressed into hub. There is no fixing them- replace only.