[R-390] More geartrain rebuild info

[John KA1XC]

Perc is perchlorethylene aka tetrachloroethylene.
Really, you got it for free?  I used to work in my dad's drycleaning plant
and remember that it cost many bucks a gallon, which justified using lots of
extra machinery to recover the lost vapors and also residual perc left in
the carbon filters prior to their disposal. Because of environmental and
health reasons (it's a carcinogin) a lot of plants are phasing it out in
favor of other solvents or hi-tech "wet" cleaning.

It is a great solvent but it evaporates like crazy, and it is a close cousin
to most Brake-cleaner products and even smells the same. Sometimes when I'm
shopping for Brake cleaner in the big auto parts stores I'll spray a small
burst into the can cap, if I smell the "perc" smell I know I'm getting the
original formula as opposed to the newer enviro-friendlier non-chlorinated
formula which is being phased in. I guess I like to buy what I'm familiar
with.

73,
John




Hi:

Another great cleaner and almost as good as carbon tetrachloride is
available from your friendly local dry cleaner. It's called perc for
short-don't know the full chemical name. Arrive with a 500 ml bottle and
green stamps-most times you'll get it for free!

Robert, VE3BE