Dodge B-I-B 1948 - Crankcase Ventilation

CRANKCASE VENTILATION
In the operation of an automobile engine, the engine oil is sub-
jected to dilution and contamination by water, fuel, acid and other
foreign elements which reduce the lubricating quality of the oil. In
your Dodge engine, a special ventilating system. expels a large
amount of these undesirable elements, but enough remain to make
it advisable to drain the crankcase at the intervals recommended
in this manual.
Accumulations
of non-lubricating elements in the engine oil have
a damaging effect on highly finished metal surfaces. Water has no
lubricating value,
and is likely to freeze. Fuel thins the oil, thus
reducing its value
as a lubricant. Acid attacks m~tal surfaces, caus-
ing excessive
wear.
Air for ventilating the crank chamber enters the oil filler pipe.
This air is filtered by passing through the air cleaner in the filler
pipe cap. Therefore, in order for the crankcase ventilation system
to function efficiently
and expel as much of these undesirable ele-
ments as possible, the oil filler pipe air cleaner should be serviced
as recommended in the lubrication chart, page 18.
ENGINE OIL DILUTION AND OIL PAN SLUDGE
16