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21. Remove the idle speed adjusting
screw
and spring from the throttle body.
S. CLEANING AND INSPECTION
A. Cleaning
22. Lightly tap the throttle body
with a fiber
mallet to loosen and remove the
throttle shaft
bearing at the governor end of the
throttle shaft.
FIGURE 50. REMOVING THROTTLE SHAFT
RETAINER
23. With Snap-On Tool No. MC-95,
lift the
wire throttle shaft retainer out
of the slot in the
throttle body and slide the throttle
shaft with
attached bearing out of the throttle
body.
1. Soak all castings and metal parts,
except
the dashpot and spark valve body,
in a cleaning
solution long enough to loosen all
foreign deposits.
If a commercial cleaning solvent
is not available,
lacquer thinner or denatured alcohol
may be used.
Place the parts and castings to
be cleaned in a
metal basket suspended in the solution
to keep
them out of the sediment which collects
in the
bottom of the container. Agitating
the parts in
the solution usually promotes a
more thorough
cleaning. After the parts have soaked
sufficiently,
rinse them in hot water to remove
all traces of
the cleaning solution. While rinsing
the parts and
castings, scrub away all remaining
foreign matter
with a stiff bristle brush.
2. Soak each part and casting in
clean gasoline
for a few seconds and dry them with
compressed
air. Compressed air should also
be directed
through all passages in the castings
and through
all jets and tubes.
3. The dashpot and spark valve body
should
not be exposed to the solvent, as
most commercial
solvents will deteriorate the neoprene
diaphragms
in these units. Their exteriors
may be cleaned
with a rag dipped in gasoline and
wrung almost
dry. They should not be dried with
compressed
air as the compressed air may rupture
the dia
phragms.
CAUTION
Carburetor jets and passages should
never
be cleaned with a drill, wire or
similar
object. This method of cleaning
may dis
tort jets and passages, and affect
carbu
tor performance. A buffing wheel,
wire
brush, file, or other sharp instrument
should not be used to remove carbon
de
posits, as the protective plating
on the part
might be removed by scratching
or filing.
NOTE
Parts such as the accelerating
pump pis
ton, gaskets, diaphragms and felt
seals,
should never be exposed to the
cleaning
solvent. Most commercial solvents
will
deteriorate these parts.
FIGURE 51. REMOVING THROTTLE SHAFT,
BEARING, AND THROTTLE PLATES
4. The air cleaner should be cleaned
at this
time to insure proper carburetor
performance.
"'BOTTLE RLA
THROTTLE SHAFT GEARING
'' >OVF
