Yes, the information was correct.
If a prime mover had been shut down for more than an hour the person
re-starting it was expected to open all cylinder test cocks and BAR the engine
over a couple of revolutions. This was to assure no water would be trapped in
any cylinder during the cranking event. Should a cylinder have water in it as
cranking began it would soon come to a stop as the column of water reached the
head.
Since water is, for all practical purposes, non-compressible an assembly would
be damaged if the piston "hit" the column of water during cranking. This was
referred to as hydraulic lock or "ya just hydraulicked 'er". The rods affected
by this condition quite often resembled the letter "C".
Karl
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