On 1/16/05 10:52 PM, in article ,
"frank1492" wrote:

There is a stainless steel bolt (about 3/16 diam) that
is threaded into the center of the motor shaft in an old
dishwasher that I am repairing. In order to remove the
impeller and other parts for replacement, it was necessary
to unscrew the bolt. Having no success, I ground the head
off, thinking I could then liberally apply penetrating oil and
eventually get the bolt out by turning it with a vice-grip.
Despite numerous oil applications and twisting to the
breaking point, the bolt has refused to unscrew.
It is very important that the bolt not break off, as it
would be very difficult for me to redrill the hole concentrically.
Would it be worth trying to heat the bolt with a propane
torch? How should this be done, and what would the risks
be? Would there be increased risk of shearing the bolt off
after heating (assuming it still won't yield at the threads)?

Some cut.

You need to heat the motor shaft instead of the bolt. The idea is to
expand the shaft so it will release the bolt. It might help to heat the
shaft then dump water on it to cool it rapidly. Reheat it, then try to
unscrew the bolt.
Propane might not be a hot enough fuel. I'm used to using an acetylene
torch for these type problems. There is something called a mapp gas torch
that is fairly cheap and would produce a hotter flame than propane.

Dean



----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups
---= East/West-Coast Server Farms - Total Privacy via Encryption =---