If
the
carburetor
air
temperature gage needle moves into the yellow
arc
during potential
carburetor
icing conditions,
or
there
is
an unex-
plained drop
in
RPM, apply full
carburetor
heat.
Upon
regaining the
original
RPM (with heat off), determine
by
trial
and
error
the minimum
amount
of
carburetor
heat required for
ice-free
operation.
I
NOTE
Carburetor
heat should not be applied during take-off
. unless absolutely
necessary
to obtain smooth engine
acceleration (usually
in
sub-zero temperatures).
OIL
QUICK-DRAIN
VALVE
I
An oil quick-drain valve
is
optionally 9ffered
to
replace the
drain
-
·.
plug in the oil sump
drain
port.
The
valve provides a qUicker and clean-:
er
method
of
clTaining engine oil.
To
drain the oil with this valve
in
.:
stalled, slip a hose over
t~e
end
of
the valve, route the hose to a suitable
container, then push upward
ori
the
end
of
the valve until
it
snaps into
~he
open
position. Spring blips will hold the valve open. After draining, use
a screwdriver
or
suitable tool to snap the valve into the extended (closed)
p~sition
and remove the
drain
hose •.
I
7-6
..
-
~
.
·I
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