excessive idling, do
not
permit
the
thorough
warming
up
of
the
engine
nor
the
efficient
operation
of
automatic
control
devices.
It
is recommended
that
the
oil
be
changed
more
often
when
the
truck
is
subjected
to
this
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.
Keep
your
truck
in
good mechanical condition.
Poor
fuels which contain portions
hard
to
ignite
and
slow
to
burn
will increase
crankcase
dilution.
Use
good fuel.
Water
in
Crankcase.
Serious
lubrication
troubles
may
result
in
cold
weather
due
to
an
accumulation of
water
in
the
oil pan.
This condition is as a
rule
little
understood
by
the
truck
owner.
To
demonstrate
the
chief
cause
of
water
in
the
oil pan, hold
a piece of cold
metal
near
the
end
of
the
exhaust
pipe of
the
engine
and
note
the
rapid
condensation
and
collection of drops
of
water
on it.
The
exhaust
gases
are
charged
with
water
vapor
and
the
moment
these
gases
strike
a cold surface,
they
will
condense, forming drops of
water.
A slight
amount
of
these
gases pass
the
pistons
and
rings,
even
under
the
most favorable conditions,
and
cause
the
forma-
tion of
water
in
the
oil pan,
in
a
greater
or
lesser
degree,
until
the
engine becomes
warm.
When
the
engine becomes
thor-
oughly
warm,
the
crankcase
will no
longer
act
as
a condenser
and
all of
these
gases will pass
out
through
the
crankcase
ventilator
system.
Short
runs
in cold
weather,
such
as city driving, will aggra-
vate this condition.
Corrosion.
Pract~any
all
present
day
engine fuel contains a
small
amount
of
sulphur
which,
in
the
state
in which
it
is
found, is harmless;
but
this
sulphur
on
burning, forms
certain
gases, a small
portion
of which is likely to
leak
past
the
pistons
and
rings
and
reacting
with
water,
when
present
in
the
crank-
case, form corrosive acids.
The
more
sulphur
in
the
fuel,
the
greater
the
danger
from this
type
of corrosion. This is a con-
dition which
we
cannot
wholly avoid,
but
it
may
be
reduced
to a
minimum
by
proper
care
of
the
engine.
As long as
the
gases
and
the
internal
walls of
the
crank-
case
are
hot
enough
to
keep
water
vapor
from condensing, no
harm
will result;
but
when
an
engine is
run
in low
tempera-
tures,
moisture
will collect
and
unite
with
the
gases formed
by
'76'
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