>First, check for something interfering with free rotation, such as:
>  -lint wound around the fan shaft
>  -dirt on the fan housing that rubs the tip of a fan blade
>  -worn bearings, that allow the shaft too much sideways motion and
>     let the motor armature rub the inside of the stator
>     (Noisy, especially if you wiggle the fan in a plane containing its
>     axis while it is running.)
>Look for worn brushes (Under two large "screws" - one on each side at one end
>of the motor.)  A shop specializing in small electric motor repairs, such as
>electric shavers, might be able to find replacements.
>
>These last two are only likely on older/cheaper fans, as most fans use
>sealed ball bearings and brushless (electronic) commutation.
>
>Even the best sealed ball bearings will eventually wear out.  Spraying
>with oil will just make the outside sticky and collect dirt (which may
>unbalance the fan).  Only if you can see the ends of the motor shaft
>might a *tiny* drop of light oil help.  Use a toothpick or needle
>applicator to put a drop of SAE 10 ("sewing machine oil") on both
>ends of the shaft where it goes into the body of the motor
>- unless you find oiling holes for an old journal bearing.
>
>If the bearings are going, or there is a problem with the commutation,
>consider the relative costs of the system and the price of a new fan.
>A reliable fan is good insurance that you won't overheat and shorten
>the life of your computer.
>
>Boyd Ramsay

With all the talk of "fan" care and the use of WD-40, is there a filter that
can be placed
on the back of the power supply that will help keep the dust and lint out?
If not, can a cutout of a pair of pantyhose stretched over the vent be
enough to keep
out the dust?

Winston

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