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f. If choke housing is to be immersed in carburetor
cleaner, remove the cup seal from inside the choke
housing shaft hole (4MC models). g. Fuel filter assembly.
h. Idle stop solenoid, vacuum actuator, C.E.C. solenoid.
2. Blow out all passages in castings with compressed air.
Do not pass drills or wire through jets or passages.
3. Inspect upper and lower surface of carburetor castings
for damage.
4. Examine fuel inlet needle and seat for wear. Replace, if necessary, with new needle and seat assembly. Be careful not to bend needle pull clip.
5. Remove production (black) plastic idle mixture needle limiter caps, if used. Remove idle mixture needles and inspect for ridges, burrs, or being bent. Install idle mixture needles and springs until needles are lightly seated. Back out mixture needles specified number of turns as an initial adjustment.
NOTE: Final idle mixture and idle speed settings should be made on the car following the vehicle manufacturer's procedures and specifications.
6. Clean or replace fuel inlet filter or screen.
7. Inspect holes in levers for excessive wear or out-of
round conditions. If worn, levers should be replaced.
8. Examine fast idle cam for wear or damage.
9. Check throttle levers and valves for binds or other
damage.
10. Check air valve for binding conditions. If air valve is damaged, the air horn assembly must be replaced. A torsion spring kit is available for repairs to the air valve closing spring. A new plastic secondary metering rod cam is included in the kit.
11. Inspect metering rods and jets for wear or damage.
12. Inspect float assembly for bent float arms, or damaged
float. Check density of material in the float; if spongy
or soggy, replace float.
13. Check all diaphragms for possible ruptures or leaks.
14. Clean plastic parts only in stoddard solvent or kerosene -- never gasoline.
ASSEMBLY AND ADJUSTMENT PROCEDURES THROTTLE BODY ASSEMBLY - (Figure 41)
l. Install fast idle cam follower, fast idle lever on end of primary throttle shaft. Install torsion spring (where used) and retaining screw in end of shaft. Tighten securely. (See Figure 41, page 26)
2. If removed for cleaning, install the idle mixture needles and springs until lightly seated. Then, back out the mixture needles number of turns counted at time of disassembly (See step 2 page 26 as a preliminary idle mixture adjustment. Final adjustment must be made on the engine using the procedure described by the vehicle manufacturer.
CAUTION: Do not force the idle mixture needles against the seat or damage will result. -
3. Install lower end of pump rod in throttle lever by aligning tang on rod with slot in lever. End of rod should point outwards toward throttle lever.
FLOAT BOWL ASSEMBLY - (Refer to Figures 29, 30, 31, 32, 33, 34, 35, 42)
1. Install new throttle body to bowl insulator gasket making sure the gasket is properly positioned on two locating dowels on bottom of float bowl.
2. Install throttle body on bowl making certain throttle body is properly located over dowels on float bowl. Install throttle body to bowl screws (and lockwashers, if used) and tighten evenly and securely.
NOTE: If a new (service) throttle body is used, be sure to perform step l.d, page 30.
Place carburetor on proper holding fixture (such as BT-3553).
3. Install new fuel inlet filter, spring, new gasket(s), and inlet nut and tighten nut securely (18ft.-lbs.). The filter spring is not used on models that have a fuel strainer.
CAUTION: Do not tighten the fuel inlet nut beyond specified torque to prevent damage to the nylon gasket.
4. If used, install hot idle compensator "0" ring seal in recess in bowl, then install hot idle compensator. If used, install compensator cover and (2) retaining screws. Tighten securely.
4MV CHOKE ASSEMBLY - (Figure 42)
5. If the vacuum break diaphragm(s) was removed from bracket, slide vacuum break diaphragm between retaining ears and bend ears down slightly to hold securely.
NOTE: If a second (auxiliary) vacuum break diaphragm is used, the vacuum diaphragm rod must be installed in the vacuum break lever and plunger stem previous to installing the unit on the choke bracket.
(Early Models) Install vacuum break link (U-bend end) in slot in diaphragm plunger. End of link should be on inside of slot toward choke bracket. Install other end of vacuum break link in hole on vacuum break lever and retain with clip.
6. Install the secondary lockout lever (or idle speed-up lever), if used, on the bearing pin on the float bowl.
7. Install fast idle cam on the choke shaft making sure the cam actuating tang on the intermediate choke shaft lever is located on the underside of the tail of the fast idle cam.
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