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ENGINE FUEL AND EXHAUST SYSTEMS
CARTER CARBURETOR
3-39
carefully remove float, install a new bowl gas-
ket, and reinstall float.
16. Install vacumeter piston link in bowl
cover with lug at center opening toward outer
side of cover, then install piston on lower end
of link. Invert cover and place piston spring in
piston, then place main body over bowl cover
while guiding spring and piston into cylinder.
See figure 3-58. Use care to avoid damaging
float or changing adjustment during this
operation.
When installing bowl cover screws and lock
washers attach the code tap and wire clips in
their original locations.
17. Place pump spring in cylinder, place guide
on plunger shaft and install in cylinder, using
care to avoid creasing or curling edges of
plunger leather
washer.
Hold guide down with
finger while installing retainer
screw.
18. Start pump operating countershaft into
its bearing in bowl cover. Hold pump arm so it
is centered over pump plunger shaft and push
countershaft through arm. While holding
metering rod arm so that it engages opening
in vacumeter piston link, push countershaft
through the arm and bearing in bowl cover.
Install spring pin on end of countershaft.
19. Tighten pump arm screw. Install pump
arm link in out
er
hole of pump arm and hole in
pump plunger shaft, then install spring pin on
link.
20. Install throttle connector rod, with
spring pin on upper end and flat washer,
spring, and spring retainer on lower end.
21. Adjust Accelerating Pump Plunger
Travel .
Since the pump plunger travel controls
the amount of fuel discharged through the
pump jets, correct plunger travel is very im-
portant and should be checked and adjusted
each time the carburetor is assembled.
Pump plunger travel should be measured by
using Pump Stroke Gauge T109-117S shown in
figure 3-59. If this gauge is not available, pump
plunger travel may be measured with a ma-
chinists depth gauge having a scale reading in
64ths of an
inch,
using it in the same manner
as described for the pump stroke gauge.
(a) Back out throttle lever stop screw and
fully close throttle valves.
(b) Place Pump Stroke Gauge T109-117S
on edge of dust cover boss of bowl cover and
turn knurled nut until gauge finger "C" just
touches upper end of pump plunger shaft as
shown in figure 3-59.
f
"
.,
~
I
~:
I
~
' "
II,
Figure 3·59-Use of Pump Stroke Gauge T109·1175
(c) Read figure on gauge at notch in knurled
nut, then open throttle slowly until plunger just
bottoms (at approximately half throttle). This
will be indicated by the additional force re-
quired to move throttle lever. Hold throttle
lever at this point and
t
ake a second reading
on gauge.
(d) The difference between the first and sec-
ond reading on gauge should be 21. When using
a machinists depth gauge the difference should
be
2~{H".
(e)
If
pump plunger travel is not 2Yt;4" , ad-
just as required by bending the throttle con-
nector rod at the upper angle indicated by "D"
in figure 3-59.
22. Install metering rod spring through hole
in piston link. Insert end of each metering rod
in hooked end of spring, push metering rod
down and rotate eye of rod over pins on link,
using care to avoid bending metering
r
od. See
fizure
3-44.
~3
.
Adjust Met ering Rods. Proper
setting of
the metering rods is of
vital
importance to en-
gine performance and fuel economy; therefore
the following adjustment must be carefully
made 'aft er adjusting the pump plunger travel.
(a) Back out throttle lever stop screw to al-
low throttle valves to seat in bores of carbu-
retor and loosen metering rod arm clamp screw.
(b) Press down on vacumeter link until me-
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