No part of the collar should be removed unless absolutely necessary.
CHAPTER IX
OXYGEN PROCESS FOR REMOVAL OF CARBON
Until recently the methods used for removing carbon deposits from gas
engine cylinders were very impractical and unsatisfactory. The job meant
dismantling the motor, tearing out all parts, and scraping the pistons and
cylinder walls by hand.
The work was never done thoroughly. It required hours of time to do it, and
then there was always the danger of injuring the inside of the cylinders.
These methods have been to a large extent superseded by the use of oxygen
under pressure. The various devices that are being manufactured are known
as carbon removers, decarbonizers, etc., and large numbers of them are in
use in the automobile and gasoline traction motor industry.
_Outfit._--The oxygen carbon cleaner consists of a high pressure
oxygen cylinder with automatic reducing valve, usually constructed on the
diaphragm principle, thus assuring positive regulation of pressure. This
valve is fitted with a pressure gauge, rubber hose, decarbonizing torch
with shut off and flexible tube for insertion into the chamber from which
the carbon is to be removed.
There should also be an asbestos swab for swabbing out the inside of the
cylinder or other chamber with kerosene previous to starting the operation.
The action consists in simply burning the carbon to a fine dust in the
presence of the stream of oxygen, this dust being then blown out.
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