"Don" wrote in message
k.net...

"Greg O" wrote in message
...

"Don" wrote in message
k.net...


So, are you saying the metal, upon expansion, acts like the hole is not
there, that the whole thing is solid?
Incidently, I know that heating metal up, like pulleys, works because
I've done it.


It may clear it up if you think of a metal ring instead of a pulley. Cut
the metal ring and lay it out flat and heat it up. The length will
change
considerably, although at the same proportion as the diameter. If the
metal rod was rolled back into a ring and heated you have the "length"
expanding and pushing against its self causing the hole to get larger.
Although the pulley will expand in all directions, the ring shape causes
the hole to open up when heated.
Confused yet?

LOL
Actually, that was a good explanation, Greg.

Some years back, in another lifetime, I worked part time for a good friend
who owned a service station. Learned a trick from him about the pressed on
alternator pulleys used by Chrysler. When doing alternator work that
required removing the pulley, when it was time to reinstall it, he would put
the alternator in the ice dispenser for a while, then put the pulley itself
on an electric hotplate for about five minutes. Get alternator from freezer,
pick up pulley with channelocks, voila! Pulley falls right on, no need to
press it on. Once the temperatures return to normal, shaft has expanded &
pulley has contracted, now it will require a puller to remove it again.

--
Nahmie
Those on the cutting edge bleed a lot.