GASOLINE
CARBURETION
ON
SMAL
.L
GASOLINE
ENGINES
IS
ALWAYS
CRITICAL
OF
DIRT.
IT
IS
RECOMMENDED
THAT
A FI
LTERING
FUEL
FUNNEL
ALWAYS
BE
USED
ALONG
WITH
CLEAN
GASOLINE.
AT
ANY
EVIDENCE
OF
FUEL
STARVATION,
CLEAN
THE
FI LTER
IN
THE
TANK
OUTLET
FITTING.
DO
NOT
MIX
OIL
WITH
GASOLINE
FOR THIS ENGINE.
Engines
used
in
Case
Tractors
are
designed
to
operate on
REGULAR
or UN·
LEADED
GRADE
gasoline having a
minimum
research method rating
of
90.7 Octane.
This
will
give
full
power and economy together
with
long engine life and
low
mainten-
ance
cost.
The typical Octane number ratings
for
regular grade gasoline (March 1967).
Motor
Method
86.2
Octane Number
Research Method
94.20ctane
Number
Average
90.2 Octane Number
These
two
Octane ratings
are
used
to
define the anti-knock
quality
of
gasoline.
It
has
become common practice in the Petroleum
Industry
to
refer
only
to
the RESEARCH
METHOD
RATING
although in the
United
States the
average
of
the
two
figures
is
posted
on gasoline pumps.
When
only
one
Octane rating
is
given
for
gasoline and the rating method
is
not
specified,
it
can
be
assumed
to
be
the
average
rating in the United States or the Research
Method Rating elsewhere in the World.
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