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3-36
CARTER CARBURETOR
ENGINE FUEL AND EXHAUST SYSTEMS
(
110 )
gummy deposits that
have
been softened by the
cleaner.
Do not soak cork, plastic, or leather parts
such as the vacuum switch terminal cap, switch
guide block,
choke
thermostat and housing, and
pump plunger in the cleaner. Wipe such parts
with a clean
cloth.
Remove all carbon from barrels of the body
flange so that throttle valves may close properly.
c. Inspection of Carburetor Parts
After being thoroughly cleaned, all parts of
the carburetor should be carefully inspected for
wear or
damage
as follows:
1. Climatic Control. Inspect control parts as
described in paragraph 3-24.
'
.
2.
Bowl
Cover.
Check for warped surfaces
with a straight edge. Make sure that idle and
pump channels are clean and clear. Inspect
pump cylinder for scoring or roughness. In-
spect bearings of pump operating countershaft
for wear or scoring.
If
bowl strainer is dam-
aged or clogged so that it cannot be cleaned, it
should be replaced.
3. Float Ne
edle
and
Seat.
Because of the
wear that normally occurs in these parts and
the necessity of having a tight seating needle,
it is ad
visable
to replace these parts if the car-
buretor has been used for considerable
mileage.
4.
Accelerating
Pump Parts. Inspect coun-
tershaft assembly for wear of shaft and make
sure that lever is tight on countershaft.
Inspect throttle connector rod and holes in
throttle shaft arm and pump operating lever
for excessive
wear.
Inspect pump plunger leather washer for
cracks, creases, turned edges, or other
damage.
Check holes in plunger shaft and pump arm,
also pump arm link, for excessive wear.
Inspect pump check needle for groove on ta-
pered end and inspect needle seat in discharge
check plug.
If
pump discharge passage plug
contains a relief valve, test seating of valve by
sucking on
threaded
end of plug. Inspect pump
intake ball for corrosion and the retainer for
distortion.
Blow through each pump jet
to make
sure it
is clear.
5. Low
Speed Jets.
Test j
ets by
blowing or
sucking to make sure that
metering
holes are
clear.
Inspect small ends for damage which
might deform the metering holes.
6.
Metering Rods,
J
ets,
and
Spring.
Meter-
ing rods and jets are subject to wear in normal
use. As the parts
wear,
the metering orifice
becomes larger and a ri
cher
mixture results.
If
carburetor has been used
fo
r considerable mile-
age, it is advisable to replace
these
parts since
wear cannot readily be detected by
inspection.
If
metering rod
spring
is distorted or
damaged
it should be
replaced
since it performs an im-
portant function in keeping wear of metering
rods and jets at a minimum.
7.
Vacumeter Piston. Inspect
vacumeter pis-
ton and the cylinder in
main
body for scoring
or roughness. Piston and
cylinder
must be
clean
and
smooth.
If
piston sp
ring
is distorted it
should be
replaced.
8. Body Flange
Parts.
Be sure that the idle
discharge ports are clean of all ca r bon deposits
and that the seats for idle adjustment screws
are not damaged.
If
ends of adjustment screws
are grooved or bent
they
should be replaced.
Check wear of
throttle
shaft
bearing
and
throttle
shaft.
There should not
be
more than
about .005" play between shaft and bearings,
otherwise air leaks will
interfer e
with perform-
ance.
Make sure that throttle valves are not
bent
and do not
have
burrs or sharp
edges.
9.
Accelerator
Va
cuum Sw itch.
Inspect
ball,
plunger, and cylinder in body flange to make
sure all are clean and smooth.
Check
t
erminal
cap for cracks. Switch
contact
su
r faces
must
be smooth and free of corrosion.
If
st r ain er is
damaged or is clogged so that it cannot be
cleaned it should be
r
emoved.
3-26 ASSEMBLY AND ADJUSTMENT OF
CARTER CARBURETOR
a. Assembly of Carburetor
In the assembly of carburetor, use all new
gaskets
and any additional new parts found to
be necessary during
inspection.
Th
e
follo
wing
new
gask et s
must be soak
ed
in 90 proof dena-
tured
alcohol for
15
minutes,
installed on
part,
and
let dry before
installing th
e parts:
Needle seat gasket
Pump
discharge passage
plug
gask et
Bowl
strainer
nut
gasket
1. Install n
ew idle port r
ivet plugs if old
plugs
were
r
emoved
from
body flange. Install
springs and idle ad
justment
screws in
body
flange. Seat screws
lightly with finger s, then
turn each screw out exactly one full turn off
seat. Do not force a screw against
its seat ;
this
will score the point of screw and ruin it fo
r
service.
2. Place fast idle cam and cam trip
lever
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