Cadillac V-63 1923 Operator's Manual page 21

34 LUBRICATION
After cleaning the lubricating system with a mixture of kerosene and
engine oil it is a good plan to clean the valve and seat of the pressure regu-
lator. The regulator is located just back of the right hand block of cylinders.
The valve can be removed after removing the regulator cover by unscrew-
ing it. It is important also to make certain that the small by-pass hole by
which oil is permitted to escape when the regulator valve is closed, is clean
and free from any obstruction.
Do not use waste in cleaning the regulator valve or its seat. Use cloth
free from lint.
Caution:—Do not fail to replace the engine oil as frequently as suggested.
Replace Engine Oil Frequently During Cold Weather
The mileages given under "Replace Engine Oil" at which engine oil
should be replaced and the oil pan and screen cleaned are those at which
this work should be done during warm weather.
During cold weather water and gasoline may accumulate in the crank-
case of the engine. It is necessary, therefore, to drain the oil pan and clean
the oil pan and 'screen much more frequently than during warm weather.
The frequency with which it is necessary to do this depends very largely
upon the manner in which the car is driven. In cases where the car is driven
short distances only and frequent stops are made so that the engine base
and the oil remain cold it will be necessary to drain the oil pan and to clean
the oil pan and screen much more frequently than in cases where the car
is driven for longer distances with fewer stops, so that the engine base
becomes thoroughly warmed.
If the car is constantly making short trips in cold weather the oil should
be drained every 350 miles of travel or once a week and the oil pan and
screen cleaned once a month.
Unless the oil is drained out and the oil pan and screen are cleaned frequently
in cold weather, serious damage to the engine may result, particularly on cars in
short trip service.
Oil Pressure
The pressure indicated by the oil gauge on the instrument board varies
with the speed and temperature of the engine and the viscosity of the oil.
When the engine is warm and supplied with fresh Cadillac Engine Oil or oil
of approximately the same viscosity, the pressure as indicated by the gauge
should be from five to seven pounds when the engine is idling. (When idling
the engine should run at approximately 300 revolutions per minute, if the
LUBRICATION
35
throttle stop-screw at the carburetor is properly adjusted.) At higher
speeds a higher pressure should be indicated and at lower speeds, a lower
pressure. Before the engine has become warm, higher pressures will be
indicated at given speeds. In other words, maximum pressures will be
indicated at given speeds when the engine is cold and the oil is fresh; mini-
mum pressures, when the engine is hot and the oil becomes thin from use.
Practically all engine lubricating oils become less viscous from use even
under normal conditions. Running the engine too long with the carburetor
enriching button pulled back will cause the oil to be thinned more rapidly
due to the condensation of gasoline from the rich mixture.
Caution
If when starting the engine after replacing the oil it is found that the
pressure gauge does not register pressure, stop the engine immediately and
prime the oil pump. This may be done by disconnecting, at its upper
end, the oil pipe running from the engine around the right hand side of the
dash, and forcing clean engine oil into the pipe. Connect the pipe and
tighten the union before starting the engine.
Do not continue to run the engine if, as a result of law viscosity of the oil,
or other cause, pressure is not indicated on the gauge when the engine is running.
(See under "Replace Engine Oil," page S3.)