Assembly Of Air Intake; Assembly Of Fuel Bowl - Ford LRG-423 Service Manual

03-32 Auxiliary Systems
03-32
ZENITH MODEL #33 CARBURETOR OPERATION AND SERVICE (Continued)
Disassembly
Disassembly consists of separating the carburetor into
two basic groups: air intake and fuel bowl-throttle body
and the disassembly of each of these groups. Use
exploded illustration as a guide for disassembly and
reassembly.
Cleaning and Inspection
Thoroughly clean all metal parts in solvent or
Deepclene. Blow out all parts and channels with
air
pressure. Inspect for damage, excessive wear, burrs
or warpage. DO NOT CLEAN NON-METALLIC
PARTS in solvent or Deepclene.
NOTE: The following assembly instructions and the
exploded illustration are generalized and include all
parts possibly found in the carburetor at this time.
Therefore, atl of the parts shown and mentioned may
not be included in the particular assembly being
worked on.
Assembly Of Air Intake
1.
Drive channel plug (50) into vacuum channel
flush with surface.
2. Drive cup plug (4) into end of choke shaft hole
opposite choke lever.
3. Insert choke shaft (53) with milled flat toward top.
4. ' Install choke plate (2) in air intake and start
screws (1). Note that edges are beveled to fit
against wall when closed. On plates including
poppet valve, the spring should face the top. Hold
choke plate closed with finger and tighten
screws.
5. Turn air intake upside down and insert vacuum
power piston (6) into cylinder, making sure it will
move freely. Hold in place and stake casting with
punch at three points to retain piston assembly.
6.
Press well filler tube (7) into casting to shoulder.
Do not bend or distort.
7.
Press idle tube (49) into casting with rolled down
orifice into casting until the bottom end is 1.25
inches from the cast surface. Do not bend or
distort.
Assembly Of Fuel Bowl
1. Install the following parts as needed (not normally
removed for service):
a. Cup plug (17) in shaft hole flush
b. Fuel channel plug (23) flush
c. Welch plug (24) over idle port
d. Idle channel plug (25) flush
e. Welch plug (31) over spark vacuum port
f. Spark vacuum tube (32) to approximately 9/l 6
from casting
g. Throttle body plug (36) flush
h. Pump check valve (42) flush using tool
c151-53.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
i. Well tube (44) making sure that end openings
align with notch in casting at top and fuel
channel at bottom.
Slide seal (33) over throttle shaft with lip toward
lever and install shaft in body.
Back out throttle stop screw (35) and place body
on bench with mounting flange up.
With milled flat up, install throttle plate (30) with
short side toward idle port and start screws (28).
Make sure beveled sides of plate are next to
throttle body bore. Tap the plate lightly (plate held
closed) to center it and tighten screws.
While holding throttle closed, screw idle stop
screw (35) in until it touches the casting, then
screw in an additional 3/4 turn.
Install idle needle (27) washer (56) and spring
(26) and screw in to gently touch the seat. Back
screw out approximately one turn.
Install power jet valve (14) using Cl 61-9 wrench.
No gasket required.
Install main jet (22) and seat firmly with
screwdriver. No gasket required.
Install main jet plug (20) and washer (21) and
tighten securely. If main jet adjustment or
solenoid shutoff are used, install in place of plug.
Turn body right side up. Insert float axle (13) into
holes in float (12).
Lower float axle and float into slot provided in
body with the float needle sticking into the
threaded opening.
Install the fuel valve seat (19) and washer (18)
making sure that the fuel valve enters the seat
properly (the valve will enter the seat more easily
if the float is heid in the up position) and tighten
securely.
Insert float axle clip (11) in slot to bear against
axle ends. Holding axle in place, raise float by
applying light finger pressure to the float bracket.
Float pontoons should be approximately level
when the valve is seated. If not, bend tab
carefully to adjust.
Install O-ring (54) on venturi skirt and place
venturi (10) into recess provided in body making
sure that the nozzle (9) lines up with the notch in
the fuel well.