All pullies have bearing in them.Grab the pulley and try to move it up and down.Excess play means bad pulley.Watch pulley to see if it turns free and true.
Need to know which pulley.
It shaves a belt.
A bad pulley (sharp edge) A seized pulley A misaligned pulley
Well to start with the question is a bit vague. A pulley has nothing to do with a start operation; a loose pulley may cause the belt not to turn fast enough to charge the battery and that's as far as it goes. Check your belt tension. If loose tighten it. That's All
well I don't know you should be telling me.
They usually leak from the weep hole under the pulley.
They usually leak from the weep hole under the pulley.
the pulley is bad when it stops moving
Need to know which pulley.
That pulley has a bearing on the inside of it that has gone bad. Replace the pulley with a new 1
I'm assuming you mean a pulley, which is what the belts run on. If so, depending on which pulley the bearings could be bad or if it is the crankshaft pulley (big pulley near the bottom) the rubber could be getting bad.
When it goes bad
In most cases you can purchase the bearing and pulley as an assembly from your local auto parts store.
Serious vibrations.
cause the tensen pulley could be going bad an my need to be replaced or even your alternater pulley can be getting ready to go bad
Normally the idler wheel will have a bad bearing and will make a lot of grinding noise and or vibrate big time! If the bearings go out all together you will know real quick like as it will most likely burn or rip the belt off!
what pulley/ there are only about 7 or so on a vehicle. water pump, alternator, ac, power steering pulley