Andrei,

> Is WD40 suitable for such fans?

The bearing is covered by a plastic cap or a sticker or both.  Very little of 
any sprayed 
lubricant will reach the bearing.  Very similar to spraying a jet of oil at the 
wheel 
of a car to "fix" a bad wheel bearing.  Also, the spray will coat parts which 
don't 
need it.  That will collect more dust and help polymers deteriorate.

If you really want to fix it, the fan must be dismantled.  Not difficult; just 
requires 
patient & careful effort.  Once it is apart the repair must be appropriate to 
the 
problem.  As mentioned a few days back, a ball bearing will need cleaning and 
oiling 
or replacement, depending on condition.  A sintered bushing will need to have 
wear 
particles cleaned out.  Fresh oil in a dirty bushing won't help for long.

More here.
http://en.wikipedia.org/wiki/Plain_bearing
http://en.wikipedia.org/wiki/Sintering
http://en.wikipedia.org/wiki/Ball_bearing

Regards,           ... Peter E.

-- 
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Personal pages http://members.shaw.ca/peasthope/ .


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