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is
that of crankcase dilution, which is the
thinning
of
the
oil
by
fuel vapor
leaking
by
pistons
and
rings
and
mixing
with
the oil.
Leakage
of
fuel
or
fuel
vapors
into the
oil
pan
mostly
occurs during
the
"warming
upn
period when
the
fuel is not
thoroughly vaporized and
burned.
Automatic Control Devices to I\1inunize
Crankcase
Dilu tion
The
Corvette engine
is
equipped with automatic
devices
which
aid greatly
in minimizing lhe danger
of crankcase
dilution.
Rapid
warming
up
of
the
engine
is
aided
by the thermo-
static
water
temperature
control
which
aUlomatically
pre-
vents
circulation of coolant
through the radiator until it
reaches a
pre-determined temperature.
When
operative, the
thermostatic heat
control on
lhe
exhaust manifold during the warming up period
auto-
matically
directs the
hot exhaust
gases against
the
ccnter
of lhe intake
manifold, greatly aiding
in proper vaporiza-
[ion
of the
fuel. See page
38
for further infomlation on the
manifold heat
control valve
in
your Corvette engine.
An
efficient crankcase ventilating system drives off
fuel
vapors
and aids
in the
evaporation
of the raw fuel
and
water
which
may find its watt into the oil
reservoir.
Control by Car Owners Under AbnorD1al Conditions
Ordinarily the
above automatic control
devices
will
mini-
mize
or
eliminate the danger of crankcase
dilution.
How-
ever,
there
are abnormal conditions of service
when the
car
owner
must aid in lhe
control of crankcase dHuLion.
Sparing use
of
the
cho,
k e reduces danger
of
raw
or
unvapor-
ized fuel
entering
the
combustion chamber and
leaking
into
the oil reservoir.
Short
runs in
cold
weather,
such as city
driving
and exces-
sive
idling, do not permit the thorougb
warming
up of the
engine
nor the
efficient
operation
of automatic
control
devices. It is recommended thal the
oil
be
changed
more
often
when
the
car
is subjected
to
rhis type
of operation.
Poor mechanical
condition of
the
engine such as
scored
cylinders,
poor ring fit.
sloppy or
loose
pistons,
faulty
valves, and poor
ignition
will
increase
crankcase
dilution.
Poor fuels
which
contain portions hard
to
ignite
and slow
to bum
will
also
increase crankcase
dilution.
Water in Crankcase
Serious lubrication troubles may result
in cold
weather
by
an accumulation
of water in the oil pan. This
condition is,
as a
rule, little understood
by
the
owner. To demonstrate
the
chjef cause of
water in the
oil
pan, hold
a
piece of cold
metal near !.he end of !.he
exhaust
pipe of !.he
engine and
59
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